Vulnerabilities > CVE-2015-8325 - Permissions, Privileges, and Access Controls vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
The do_setup_env function in session.c in sshd in OpenSSH through 7.2p2, when the UseLogin feature is enabled and PAM is configured to read .pam_environment files in user home directories, allows local users to gain privileges by triggering a crafted environment for the /bin/login program, as demonstrated by an LD_PRELOAD environment variable.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 2 | |
| OS | 5 | |
| Application | 12 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Accessing, Modifying or Executing Executable Files An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
- Leverage Executable Code in Non-Executable Files An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
- Blue Boxing This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
- Restful Privilege Elevation Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
- Target Programs with Elevated Privileges This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
Nessus
NASL family Slackware Local Security Checks NASL id SLACKWARE_SSA_2016-219-03.NASL description New openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues. last seen 2020-06-01 modified 2020-06-02 plugin id 92760 published 2016-08-08 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/92760 title Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : openssh (SSA:2016-219-03) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Slackware Security Advisory 2016-219-03. The text # itself is copyright (C) Slackware Linux, Inc. # include("compat.inc"); if (description) { script_id(92760); script_version("2.3"); script_cvs_date("Date: 2019/04/11 17:23:07"); script_cve_id("CVE-2015-8325", "CVE-2016-6210"); script_xref(name:"SSA", value:"2016-219-03"); script_name(english:"Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : openssh (SSA:2016-219-03)"); script_summary(english:"Checks for updated package in /var/log/packages"); script_set_attribute( attribute:"synopsis", value:"The remote Slackware host is missing a security update." ); script_set_attribute( attribute:"description", value: "New openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues." ); # http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.613746 script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?8b5fd888" ); script_set_attribute( attribute:"solution", value:"Update the affected openssh package." ); script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:slackware:slackware_linux:openssh"); script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux"); script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:13.0"); script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:13.1"); script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:13.37"); script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.0"); script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.1"); script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.2"); script_set_attribute(attribute:"patch_publication_date", value:"2016/08/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2016/08/08"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Slackware Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/Slackware/release", "Host/Slackware/packages"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("slackware.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/Slackware/release")) audit(AUDIT_OS_NOT, "Slackware"); if (!get_kb_item("Host/Slackware/packages")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Slackware", cpu); flag = 0; if (slackware_check(osver:"13.0", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"i486", pkgnum:"1_slack13.0")) flag++; if (slackware_check(osver:"13.0", arch:"x86_64", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"x86_64", pkgnum:"1_slack13.0")) flag++; if (slackware_check(osver:"13.1", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"i486", pkgnum:"1_slack13.1")) flag++; if (slackware_check(osver:"13.1", arch:"x86_64", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"x86_64", pkgnum:"1_slack13.1")) flag++; if (slackware_check(osver:"13.37", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"i486", pkgnum:"1_slack13.37")) flag++; if (slackware_check(osver:"13.37", arch:"x86_64", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"x86_64", pkgnum:"1_slack13.37")) flag++; if (slackware_check(osver:"14.0", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"i486", pkgnum:"1_slack14.0")) flag++; if (slackware_check(osver:"14.0", arch:"x86_64", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"x86_64", pkgnum:"1_slack14.0")) flag++; if (slackware_check(osver:"14.1", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"i486", pkgnum:"1_slack14.1")) flag++; if (slackware_check(osver:"14.1", arch:"x86_64", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"x86_64", pkgnum:"1_slack14.1")) flag++; if (slackware_check(osver:"14.2", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"i586", pkgnum:"1_slack14.2")) flag++; if (slackware_check(osver:"14.2", arch:"x86_64", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"x86_64", pkgnum:"1_slack14.2")) flag++; if (slackware_check(osver:"current", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"i586", pkgnum:"1")) flag++; if (slackware_check(osver:"current", arch:"x86_64", pkgname:"openssh", pkgver:"7.3p1", pkgarch:"x86_64", pkgnum:"1")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:slackware_report_get()); else security_hole(0); exit(0); } else audit(AUDIT_HOST_NOT, "affected");NASL family Debian Local Security Checks NASL id DEBIAN_DSA-3550.NASL description Shayan Sadigh discovered a vulnerability in OpenSSH: If PAM support is enabled and the sshd PAM configuration is configured to read userspecified environment variables and the last seen 2020-06-01 modified 2020-06-02 plugin id 90550 published 2016-04-18 reporter This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/90550 title Debian DSA-3550-1 : openssh - security update NASL family F5 Networks Local Security Checks NASL id F5_BIGIP_SOL20911042.NASL description The do_setup_env function in session.c in sshd in OpenSSH through 7.2p2, when the UseLogin feature is enabled and PAM is configured to read .pam_environment files in user home directories, allows local users to gain privileges by triggering a crafted environment for the /bin/login program, as demonstrated by an LD_PRELOAD environment variable. (CVE-2015-8325) last seen 2020-06-01 modified 2020-06-02 plugin id 105401 published 2017-12-21 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105401 title F5 Networks BIG-IP : OpenSSH vulnerability (K20911042) NASL family Fedora Local Security Checks NASL id FEDORA_2016-7F5004093E.NASL description Security fix for CVE-2015-8325: ignore PAM environment vars when UseLogin=yes. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-04-25 plugin id 90694 published 2016-04-25 reporter This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/90694 title Fedora 23 : openssh-7.2p2-3.fc23 (2016-7f5004093e) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2016-2588.NASL description From Red Hat Security Advisory 2016:2588 : An update for openssh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix(es) : * It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin= yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 94709 published 2016-11-11 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94709 title Oracle Linux 7 : openssh (ELSA-2016-2588) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2016-1053.NASL description According to the version of the openssh packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-06 modified 2017-05-01 plugin id 99815 published 2017-05-01 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/99815 title EulerOS 2.0 SP1 : openssh (EulerOS-SA-2016-1053) NASL family SuSE Local Security Checks NASL id SUSE_SU-2016-1528-1.NASL description openssh was updated to fix three security issues. These security issues were fixed : - CVE-2016-3115: Multiple CRLF injection vulnerabilities in session.c in sshd in OpenSSH allowed remote authenticated users to bypass intended shell-command restrictions via crafted X11 forwarding data, related to the (1) do_authenticated1 and (2) session_x11_req functions (bsc#970632). - CVE-2016-1908: Possible fallback from untrusted to trusted X11 forwarding (bsc#962313). - CVE-2015-8325: Ignore PAM environment vars when UseLogin=yes (bsc#975865). The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 91655 published 2016-06-17 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/91655 title SUSE SLES11 Security Update : openssh (SUSE-SU-2016:1528-1) NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2016-2588.NASL description An update for openssh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix(es) : * It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin= yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 95334 published 2016-11-28 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95334 title CentOS 7 : openssh (CESA-2016:2588) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2016-2588.NASL description An update for openssh is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix(es) : * It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin= yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 94551 published 2016-11-04 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94551 title RHEL 7 : openssh (RHSA-2016:2588) NASL family Amazon Linux Local Security Checks NASL id ALA_ALAS-2016-770.NASL description It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. last seen 2020-06-01 modified 2020-06-02 plugin id 94976 published 2016-11-21 reporter This script is Copyright (C) 2016-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/94976 title Amazon Linux AMI : openssh (ALAS-2016-770) NASL family Fedora Local Security Checks NASL id FEDORA_2016-D31C00CA51.NASL description Sync with openssh Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-07-14 plugin id 92172 published 2016-07-14 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/92172 title Fedora 23 : gsi-openssh (2016-d31c00ca51) NASL family Scientific Linux Local Security Checks NASL id SL_20170321_OPENSSH_ON_SL6_X.NASL description Security Fix(es) : - It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) last seen 2020-03-18 modified 2017-04-06 plugin id 99221 published 2017-04-06 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/99221 title Scientific Linux Security Update : openssh on SL6.x i386/x86_64 (20170321) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2017-0641.NASL description An update for openssh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix(es) : * It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin= yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 97878 published 2017-03-22 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/97878 title RHEL 6 : openssh (RHSA-2017:0641) NASL family SuSE Local Security Checks NASL id SUSE_SU-2016-1386-1.NASL description This update for OpenSSH fixes three security issues. These security issues were fixed : - CVE-2016-3115: Sanitise input for xauth(1) (bsc#970632) - CVE-2016-1908: Prevent X11 SECURITY circumvention when forwarding X11 connections (bsc#962313) - CVE-2015-8325: Ignore PAM environment when using login (bsc#975865) The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 91318 published 2016-05-25 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/91318 title SUSE SLED12 / SLES12 Security Update : openssh (SUSE-SU-2016:1386-1) NASL family Fedora Local Security Checks NASL id FEDORA_2016-CCE03CC497.NASL description Security fix for CVE-2015-8325: ignore PAM environment vars when UseLogin=yes. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-07-14 plugin id 92162 published 2016-07-14 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/92162 title Fedora 24 : openssh (2016-cce03cc497) NASL family NewStart CGSL Local Security Checks NASL id NEWSTART_CGSL_NS-SA-2019-0146_OPENSSH-LATEST.NASL description The remote NewStart CGSL host, running version MAIN 4.05, has openssh-latest packages installed that are affected by multiple vulnerabilities: - scp in OpenSSH 4.2p1 allows attackers to execute arbitrary commands via filenames that contain shell metacharacters or spaces, which are expanded twice. (CVE-2006-0225) - sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not properly handled by the CRC compensation attack detector. (CVE-2006-4924) - Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors that lead to a double-free. (CVE-2006-5051) - Unspecified vulnerability in the sshd Privilege Separation Monitor in OpenSSH before 4.5 causes weaker verification that authentication has been successful, which might allow attackers to bypass authentication. NOTE: as of 20061108, it is believed that this issue is only exploitable by leveraging vulnerabilities in the unprivileged process, which are not known to exist. (CVE-2006-5794) - Unspecified vulnerability in the linux_audit_record_event function in OpenSSH 4.3p2, as used on Fedora Core 6 and possibly other systems, allows remote attackers to write arbitrary characters to an audit log via a crafted username. NOTE: some of these details are obtained from third party information. (CVE-2007-3102) - The (1) remote_glob function in sftp-glob.c and the (2) process_put function in sftp.c in OpenSSH 5.8 and earlier, as used in FreeBSD 7.3 and 8.1, NetBSD 5.0.2, OpenBSD 4.7, and other products, allow remote authenticated users to cause a denial of service (CPU and memory consumption) via crafted glob expressions that do not match any pathnames, as demonstrated by glob expressions in SSH_FXP_STAT requests to an sftp daemon, a different vulnerability than CVE-2010-2632. (CVE-2010-4755) - The default configuration of OpenSSH through 6.1 enforces a fixed time limit between establishing a TCP connection and completing a login, which makes it easier for remote attackers to cause a denial of service (connection-slot exhaustion) by periodically making many new TCP connections. (CVE-2010-5107) - It was found that OpenSSH did not properly handle certain AcceptEnv parameter values with wildcard characters. A remote attacker could use this flaw to bypass intended environment variable restrictions. (CVE-2014-2532) - It was discovered that OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. (CVE-2014-2653) - It was found that when OpenSSH was used in a Kerberos environment, remote authenticated users were allowed to log in as a different user if they were listed in the ~/.k5users file of that user, potentially bypassing intended authentication restrictions. (CVE-2014-9278) - It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) - It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) - An information leak flaw was found in the way the OpenSSH client roaming feature was implemented. A malicious server could potentially use this flaw to leak portions of memory (possibly including private SSH keys) of a successfully authenticated OpenSSH client. (CVE-2016-0777) - An access flaw was discovered in OpenSSH; the OpenSSH client did not correctly handle failures to generate authentication cookies for untrusted X11 forwarding. A malicious or compromised remote X application could possibly use this flaw to establish a trusted connection to the local X server, even if only untrusted X11 forwarding was requested. (CVE-2016-1908) - A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses. (CVE-2016-6210) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-01 modified 2020-06-02 plugin id 127415 published 2019-08-12 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/127415 title NewStart CGSL MAIN 4.05 : openssh-latest Multiple Vulnerabilities (NS-SA-2019-0146) NASL family NewStart CGSL Local Security Checks NASL id NEWSTART_CGSL_NS-SA-2019-0139_OPENSSH.NASL description The remote NewStart CGSL host, running version MAIN 4.05, has openssh packages installed that are affected by multiple vulnerabilities: - A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses. (CVE-2016-6210) - It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-01 modified 2020-06-02 plugin id 127401 published 2019-08-12 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/127401 title NewStart CGSL MAIN 4.05 : openssh Multiple Vulnerabilities (NS-SA-2019-0139) NASL family SuSE Local Security Checks NASL id OPENSUSE-2016-668.NASL description This update for OpenSSH fixes three security issues. These security issues were fixed : - CVE-2016-3115: Sanitise input for xauth(1) (bsc#970632) - CVE-2016-1908: Prevent X11 SECURITY circumvention when forwarding X11 connections (bsc#962313) - CVE-2015-8325: Ignore PAM environment when using login (bsc#975865) These non-security issues were fixed : - Fix help output of sftp (bsc#945493) - Restarting openssh with openssh-fips installed was not working correctly (bsc#945484) - Fix crashes when /proc is not available in the chroot (bsc#947458) - Correctly parse GSSAPI KEX algorithms (bsc#961368) - More verbose FIPS mode/CC related documentation in README.FIPS (bsc#965576, bsc#960414) - Fix PRNG re-seeding (bsc#960414, bsc#729190) - Disable DH parameters under 2048 bits by default and allow lowering the limit back to the RFC 4419 specified minimum through an option (bsc#932483, bsc#948902) This update was imported from the SUSE:SLE-12:Update update project. last seen 2020-06-05 modified 2016-06-01 plugin id 91413 published 2016-06-01 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/91413 title openSUSE Security Update : openssh (openSUSE-2016-668) NASL family Scientific Linux Local Security Checks NASL id SL_20161103_OPENSSH_ON_SL7_X.NASL description Security Fix(es) : - It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Additional Changes : last seen 2020-03-18 modified 2016-12-15 plugin id 95851 published 2016-12-15 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95851 title Scientific Linux Security Update : openssh on SL7.x x86_64 (20161103) NASL family Misc. NASL id OPENSSH_73.NASL description According to its banner, the version of OpenSSH running on the remote host is prior to 7.3. It is, therefore, affected by multiple vulnerabilities : - A local privilege escalation when the UseLogin feature is enabled and PAM is configured to read .pam_environment files from home directories. (CVE-2015-8325) - A flaw exists that is due to the program returning shorter response times for authentication requests with overly long passwords for invalid users than for valid users. This may allow a remote attacker to conduct a timing attack and enumerate valid usernames. (CVE-2016-6210) - A denial of service vulnerability exists in the auth_password() function in auth-passwd.c due to a failure to limit password lengths for password authentication. An unauthenticated, remote attacker can exploit this, via a long string, to consume excessive CPU resources, resulting in a denial of service condition. (CVE-2016-6515) - An unspecified flaw exists in the CBC padding oracle countermeasures that allows an unauthenticated, remote attacker to conduct a timing attack. - A flaw exists due to improper operation ordering of MAC verification for Encrypt-then-MAC (EtM) mode transport MAC algorithms when verifying the MAC before decrypting any ciphertext. An unauthenticated, remote attacker can exploit this, via a timing attack, to disclose sensitive information. Note that Nessus has not tested for these issues but has instead relied only on the application last seen 2020-04-30 modified 2016-08-29 plugin id 93194 published 2016-08-29 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/93194 title OpenSSH < 7.3 Multiple Vulnerabilities NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201612-18.NASL description The remote host is affected by the vulnerability described in GLSA-201612-18 (OpenSSH: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in OpenSSH. Please review the CVE identifiers referenced below for details. Impact : Remote attackers could cause Denial of Service and conduct user enumeration. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 95604 published 2016-12-07 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/95604 title GLSA-201612-18 : OpenSSH: Multiple vulnerabilities NASL family Fedora Local Security Checks NASL id FEDORA_2016-99C6BC92DF.NASL description Sync with openssh Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-07-14 plugin id 92130 published 2016-07-14 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/92130 title Fedora 24 : gsi-openssh (2016-99c6bc92df) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-2966-1.NASL description Shayan Sadigh discovered that OpenSSH incorrectly handled environment files when the UseLogin feature is enabled. A local attacker could use this issue to gain privileges. (CVE-2015-8325) Ben Hawkes discovered that OpenSSH incorrectly handled certain network traffic. A remote attacker could possibly use this issue to cause OpenSSH to crash, resulting in a denial of service. This issue only applied to Ubuntu 15.10. (CVE-2016-1907) Thomas Hoger discovered that OpenSSH incorrectly handled untrusted X11 forwarding when the SECURITY extension is disabled. A connection configured as being untrusted could get switched to trusted in certain scenarios, contrary to expectations. (CVE-2016-1908) It was discovered that OpenSSH incorrectly handled certain X11 forwarding data. A remote authenticated attacker could possibly use this issue to bypass certain intended command restrictions. (CVE-2016-3115). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 91086 published 2016-05-12 reporter Ubuntu Security Notice (C) 2016-2019 Canonical, Inc. / NASL script (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/91086 title Ubuntu 12.04 LTS / 14.04 LTS / 15.10 : openssh vulnerabilities (USN-2966-1) NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_ADCCEFD1708011E6A2CBC80AA9043978.NASL description The OpenSSH project reports : * sshd(8): Mitigate timing differences in password authentication that could be used to discern valid from invalid account names when long passwords were sent and particular password hashing algorithms are in use on the server. CVE-2016-6210, reported by EddieEzra.Harari at verint.com * sshd(8): (portable only) Ignore PAM environment vars when UseLogin=yes. If PAM is configured to read user-specified environment variables and UseLogin=yes in sshd_config, then a hostile local user may attack /bin/login via LD_PRELOAD or similar environment variables set via PAM. CVE-2015-8325, found by Shayan Sadigh. last seen 2020-06-01 modified 2020-06-02 plugin id 93267 published 2016-09-02 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/93267 title FreeBSD : openssh -- sshd -- remote valid user discovery and PAM /bin/login attack (adccefd1-7080-11e6-a2cb-c80aa9043978) NASL family OracleVM Local Security Checks NASL id ORACLEVM_OVMSA-2017-0053.NASL description The remote OracleVM system is missing necessary patches to address critical security updates : - Allow to use ibmca crypto hardware (#1397547) - CVE-2015-8325: privilege escalation via user last seen 2020-06-01 modified 2020-06-02 plugin id 99080 published 2017-03-30 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/99080 title OracleVM 3.3 / 3.4 : openssh (OVMSA-2017-0053) NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2017-0641.NASL description An update for openssh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix(es) : * It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin=yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 97955 published 2017-03-27 reporter This script is Copyright (C) 2017 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/97955 title CentOS 6 : openssh (CESA-2017:0641) NASL family AIX Local Security Checks NASL id AIX_OPENSSH_ADVISORY9.NASL description The remote AIX host has a version of OpenSSH installed that is affected by the following vulnerabilities : - An elevation of privilege vulnerability exists in the do_setup_env() function within file session.c when handling user-supplied environmental variables. A local attacker can exploit this to gain elevated privileges by triggering a crafted environment for the /bin/login program. This vulnerability requires that the UseLogin feature is enabled and that PAM is configured to read .pam_environment files in user home directories. (CVE-2015-8325) - A flaw exists when handling authentication requests that involve overly long passwords due to returning shorter response times for requests for invalid users than for valid users. An unauthenticated, remote attacker can exploit this to enumerate valid usernames by conducting a timing attack. (CVE-2016-6210) - A denial of service vulnerability exists in the auth_password() function within auth-passwd.c due to a a failure to limit password lengths. An unauthenticated, remote attacker can exploit this, via overly long passwords, to cause the excessive consumption of CPU resources. (CVE-2016-6515) last seen 2020-06-01 modified 2020-06-02 plugin id 95477 published 2016-12-02 reporter This script is Copyright (C) 2016-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/95477 title AIX OpenSSH Advisory : openssh_advisory9.asc NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2017-0641.NASL description From Red Hat Security Advisory 2017:0641 : An update for openssh is now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix(es) : * It was discovered that the OpenSSH sshd daemon fetched PAM environment settings before running the login program. In configurations with UseLogin= yes and the pam_env PAM module configured to read user environment settings, a local user could use this flaw to execute arbitrary code as root. (CVE-2015-8325) Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 99067 published 2017-03-30 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/99067 title Oracle Linux 6 : openssh (ELSA-2017-0641) NASL family SuSE Local Security Checks NASL id SUSE_SU-2016-2388-1.NASL description This update for OpenSSH fixes the following issues : - Prevent user enumeration through the timing of password processing. (bsc#989363, CVE-2016-6210) - Allow lowering the DH groups parameter limit in server as well as when GSSAPI key exchange is used. (bsc#948902) - Sanitize input for xauth(1). (bsc#970632, CVE-2016-3115) - Prevent X11 SECURITY circumvention when forwarding X11 connections. (bsc#962313, CVE-2016-1908) - Disable DH parameters under 2048 bits by default and allow lowering the limit back to the RFC 4419 specified minimum through an option. (bsc#932483, bsc#948902) - Ignore PAM environment when using login. (bsc#975865, CVE-2015-8325) - Limit the accepted password length (prevents a possible denial of service). (bsc#992533, CVE-2016-6515) - Relax version requires for the openssh-askpass sub-package. (bsc#962794) - Avoid complaining about unset DISPLAY variable. (bsc#981654) - Initialize message id to prevent connection breakups in some cases. (bsc#959096) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 93735 published 2016-09-27 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/93735 title SUSE SLES11 Security Update : openssh (SUSE-SU-2016:2388-1) NASL family Junos Local Security Checks NASL id JUNIPER_JSA10940.NASL description The version of Junos OS installed on the remote host is prior to 12.3X48-D55, 12.3R12-S13, 15.1X49-D100, 15.1F6-S12, 16.1R3-S4, 16.2R1-S4, 17.1R1-S2, or 17.2R1. It is, therefore, affected by a vulnerability as referenced in the JSA10940 advisory. Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-01 modified 2020-06-02 plugin id 130514 published 2019-11-06 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130514 title Juniper JSA10940
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References
- http://rhn.redhat.com/errata/RHSA-2016-2588.html
- http://rhn.redhat.com/errata/RHSA-2016-2588.html
- http://rhn.redhat.com/errata/RHSA-2017-0641.html
- http://rhn.redhat.com/errata/RHSA-2017-0641.html
- http://www.debian.org/security/2016/dsa-3550
- http://www.debian.org/security/2016/dsa-3550
- http://www.securityfocus.com/bid/86187
- http://www.securityfocus.com/bid/86187
- http://www.securitytracker.com/id/1036487
- http://www.securitytracker.com/id/1036487
- https://anongit.mindrot.org/openssh.git/commit/?id=85bdcd7c92fe7ff133bbc4e10a65c91810f88755
- https://anongit.mindrot.org/openssh.git/commit/?id=85bdcd7c92fe7ff133bbc4e10a65c91810f88755
- https://bugzilla.redhat.com/show_bug.cgi?id=1328012
- https://bugzilla.redhat.com/show_bug.cgi?id=1328012
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-8325.html
- https://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-8325.html
- https://security.gentoo.org/glsa/201612-18
- https://security.gentoo.org/glsa/201612-18
- https://security.netapp.com/advisory/ntap-20180628-0001/
- https://security.netapp.com/advisory/ntap-20180628-0001/
- https://security-tracker.debian.org/tracker/CVE-2015-8325
- https://security-tracker.debian.org/tracker/CVE-2015-8325