Vulnerabilities > CVE-2015-6563 - Improper Input Validation vulnerability in multiple products
Attack vector
UNKNOWN Attack complexity
UNKNOWN Privileges required
UNKNOWN Confidentiality impact
UNKNOWN Integrity impact
UNKNOWN Availability impact
UNKNOWN Summary
The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family AIX Local Security Checks NASL id AIX_OPENSSH_ADVISORY6.NASL description The remote AIX host has a version of OpenSSH installed that is affected by the following vulnerabilities : - A flaw exists in the monitor component when handling extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests. A local attacker can exploit this issue to conduct an impersonation attack, by sending a crafted MONITOR_REQ_PWNAM request that leverages any SSH login access with control of the sshd UID. (CVE-2015-6563) - A use-after-free error exists in function mm_answer_pam_free_ctx() in the file monitor.c when handling MONITOR_REQ_PAM_FREE_CTX requests. A local attacker can exploit this to gain elevated privileges, by leveraging control of the sshd UID to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. (CVE-2015-6564) last seen 2020-06-01 modified 2020-06-02 plugin id 86656 published 2015-10-29 reporter This script is Copyright (C) 2015-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/86656 title AIX OpenSSH Advisory : openssh_advisory6.asc code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(86656); script_version("1.9"); script_cvs_date("Date: 2018/07/17 12:00:06"); script_cve_id("CVE-2015-6563", "CVE-2015-6564"); script_bugtraq_id(76317); script_name(english:"AIX OpenSSH Advisory : openssh_advisory6.asc"); script_summary(english:"Checks the version of the OpenSSH packages and iFixes."); script_set_attribute(attribute:"synopsis", value: "The remote AIX host has a version of OpenSSH installed that is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "The remote AIX host has a version of OpenSSH installed that is affected by the following vulnerabilities : - A flaw exists in the monitor component when handling extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests. A local attacker can exploit this issue to conduct an impersonation attack, by sending a crafted MONITOR_REQ_PWNAM request that leverages any SSH login access with control of the sshd UID. (CVE-2015-6563) - A use-after-free error exists in function mm_answer_pam_free_ctx() in the file monitor.c when handling MONITOR_REQ_PAM_FREE_CTX requests. A local attacker can exploit this to gain elevated privileges, by leveraging control of the sshd UID to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. (CVE-2015-6564)"); script_set_attribute(attribute:"see_also", value:"http://aix.software.ibm.com/aix/efixes/security/openssh_advisory6.asc"); script_set_attribute(attribute:"see_also", value:"https://www-01.ibm.com/marketing/iwm/iwm/web/preLogin.do?source=aixbp"); script_set_attribute(attribute:"solution", value: "A fix is available and can be downloaded from the AIX website."); script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_attribute(attribute:"vuln_publication_date", value:"2015/08/11"); script_set_attribute(attribute:"patch_publication_date", value:"2015/10/21"); script_set_attribute(attribute:"plugin_publication_date", value:"2015/10/29"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/o:ibm:aix:5.3"); script_set_attribute(attribute:"cpe", value:"cpe:/o:ibm:aix:6.1"); script_set_attribute(attribute:"cpe", value:"cpe:/o:ibm:aix:7.1"); script_set_attribute(attribute:"cpe", value:"cpe:/a:openbsd:openssh"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"AIX Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2015-2018 Tenable Network Security, Inc."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/AIX/lslpp", "Host/local_checks_enabled", "Host/AIX/version"); exit(0); } include("aix.inc"); include("audit.inc"); include("global_settings.inc"); include("misc_func.inc"); if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); oslevel = get_kb_item("Host/AIX/version"); if (isnull(oslevel)) audit(AUDIT_UNKNOWN_APP_VER, "AIX"); if ( oslevel != "AIX-5.3" && oslevel != "AIX-6.1" && oslevel != "AIX-7.1" ) { oslevel = ereg_replace(string:oslevel, pattern:"-", replace:" "); audit(AUDIT_OS_NOT, "AIX 5.3 / 6.1 / 7.1", oslevel); } if ( ! get_kb_item("Host/AIX/lslpp") ) audit(AUDIT_PACKAGE_LIST_MISSING); if ( get_kb_item("Host/AIX/emgr_failure" ) ) exit(0, "This AIX package check is disabled because : "+get_kb_item("Host/AIX/emgr_failure") ); flag = 0; ifixes_6110 = "(6110_ifix|IV80743m9b|IV84698m9b)"; ifixes_6201 = "(6201_ifix|IV80743m9a|IV84698m9a)"; if (aix_check_ifix(release:"5.3", patch:ifixes_6110, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++; if (aix_check_ifix(release:"5.3", patch:ifixes_6201, package:"openssh.base.client", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++; if (aix_check_ifix(release:"6.1", patch:ifixes_6110, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++; if (aix_check_ifix(release:"6.1", patch:ifixes_6201, package:"openssh.base.client", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++; if (aix_check_ifix(release:"7.1", patch:ifixes_6110, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++; if (aix_check_ifix(release:"7.1", patch:ifixes_6201, package:"openssh.base.client", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++; if (aix_check_ifix(release:"5.3", patch:ifixes_6110, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++; if (aix_check_ifix(release:"5.3", patch:ifixes_6201, package:"openssh.base.server", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++; if (aix_check_ifix(release:"6.1", patch:ifixes_6110, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++; if (aix_check_ifix(release:"6.1", patch:ifixes_6201, package:"openssh.base.server", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++; if (aix_check_ifix(release:"7.1", patch:ifixes_6110, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++; if (aix_check_ifix(release:"7.1", patch:ifixes_6201, package:"openssh.base.server", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++; if (flag) { aix_report_extra = ereg_replace(string:aix_report_get(), pattern:"[()]", replace:""); aix_report_extra = ereg_replace(string:aix_report_extra, pattern:"[|]", replace:" or "); security_report_v4( port : 0, severity : SECURITY_WARNING, extra : aix_report_extra ); } else { tested = aix_pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "openssh.base.client / openssh.base.server"); }
NASL family Scientific Linux Local Security Checks NASL id SL_20160510_OPENSSH_ON_SL6_X.NASL description Security Fix(es) : - It was found that the OpenSSH client did not properly enforce the ForwardX11Timeout setting. 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-2015-5352) - A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) - A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) - 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) last seen 2020-03-18 modified 2016-06-09 plugin id 91540 published 2016-06-09 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/91540 title Scientific Linux Security Update : openssh on SL6.x i386/x86_64 (20160510) NASL family Misc. NASL id OPENSSH_70.NASL description According to its banner, the version of OpenSSH running on the remote host is prior to 7.0. It is, therefore, affected by the following vulnerabilities : - A security bypass vulnerability exists in the kbdint_next_device() function in file auth2-chall.c that allows the circumvention of MaxAuthTries during keyboard-interactive authentication. A remote attacker can exploit this issue to force the same authentication method to be tried thousands of times in a single pass by using a crafted keyboard-interactive last seen 2020-06-01 modified 2020-06-02 plugin id 85382 published 2015-08-13 reporter This script is Copyright (C) 2015-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/85382 title OpenSSH < 7.0 Multiple Vulnerabilities NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_2920C449485011E5825FC80AA9043978.NASL description OpenSSH 6.8 and 6.9 incorrectly set TTYs to be world-writable. Local attackers may be able to write arbitrary messages to logged-in users, including terminal escape sequences. Reported by Nikolay Edigaryev. Fixed a privilege separation weakness related to PAM support. Attackers who could successfully compromise the pre-authentication process for remote code execution and who had valid credentials on the host could impersonate other users. Fixed a use-after-free bug related to PAM support that was reachable by attackers who could compromise the pre-authentication process for remote code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 85594 published 2015-08-24 reporter This script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/85594 title FreeBSD : OpenSSH -- PAM vulnerabilities (2920c449-4850-11e5-825f-c80aa9043978) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2015-2088.NASL description From Red Hat Security Advisory 2015:2088 : Updated openssh packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD last seen 2020-06-01 modified 2020-06-02 plugin id 87019 published 2015-11-24 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/87019 title Oracle Linux 7 : openssh (ELSA-2015-2088) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-1547-2.NASL description openssh was updated to fix several security issues and bugs. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. 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 85941 published 2015-09-15 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/85941 title SUSE SLED11 Security Update : openssh (SUSE-SU-2015:1547-2) (Logjam) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-1581-1.NASL description openssh was updated to fix several security issues and bugs. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. 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 86057 published 2015-09-22 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/86057 title SUSE SLED11 / SLES11 Security Update : openssh (SUSE-SU-2015:1581-1) (Logjam) NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2015-2088.NASL description Updated openssh packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD last seen 2020-06-01 modified 2020-06-02 plugin id 87128 published 2015-12-02 reporter This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/87128 title CentOS 7 : openssh (CESA-2015:2088) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2016-0741.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 found that the OpenSSH client did not properly enforce the ForwardX11Timeout setting. 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-2015-5352) * A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) * A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) * 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) For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.8 Release Notes and Red Hat Enterprise Linux 6.8 Technical Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 91073 published 2016-05-12 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/91073 title RHEL 6 : openssh (RHSA-2016:0741) NASL family Firewalls NASL id PFSENSE_SA-15_08.NASL description According to its self-reported version number, the remote pfSense install is prior to 2.2.5. It is, therefore, affected by multiple vulnerabilities as stated in the referenced vendor advisories. last seen 2020-06-01 modified 2020-06-02 plugin id 106497 published 2018-01-31 reporter This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/106497 title pfSense < 2.2.5 Multiple Vulnerabilities (SA-15_08) NASL family Fedora Local Security Checks NASL id FEDORA_2015-13469.NASL description This update provides fixes for vulnerabilities published with openssh-7.0 Security fix for CVE-2015-5600 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 2015-08-28 plugin id 85668 published 2015-08-28 reporter This script is Copyright (C) 2015-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/85668 title Fedora 21 : openssh-6.6.1p1-16.fc21 (2015-13469) NASL family F5 Networks Local Security Checks NASL id F5_BIGIP_SOL17263.NASL description CVE-2015-6563 The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. CVE-2015-6564 Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. last seen 2020-06-01 modified 2020-06-02 plugin id 91432 published 2016-06-02 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/91432 title F5 Networks BIG-IP : OpenSSH vulnerabilities (K17263) NASL family Scientific Linux Local Security Checks NASL id SL_20151119_OPENSSH_ON_SL7_X.NASL description A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) 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 found that the OpenSSH ssh-agent, a program to hold private keys used for public key authentication, was vulnerable to password guessing attacks. An attacker able to connect to the agent could use this flaw to conduct a brute-force attack to unlock keys in the ssh-agent. This update fixes the following bugs : - Previously, the sshd_config(5) man page was misleading and could thus confuse the user. This update improves the man page text to clearly describe the AllowGroups feature. - The limit for the function for restricting the number of files listed using the wildcard character (*) that prevents the Denial of Service (DoS) for both server and client was previously set too low. Consequently, the user reaching the limit was prevented from listing a directory with a large number of files over Secure File Transfer Protocol (SFTP). This update increases the aforementioned limit, thus fixing this bug. - When the ForceCommand option with a pseudoterminal was used and the MaxSession option was set to last seen 2020-03-18 modified 2015-12-22 plugin id 87567 published 2015-12-22 reporter This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/87567 title Scientific Linux Security Update : openssh on SL7.x x86_64 (20151119) NASL family Amazon Linux Local Security Checks NASL id ALA_ALAS-2015-625.NASL description A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. 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. A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. last seen 2020-06-01 modified 2020-06-02 plugin id 87351 published 2015-12-15 reporter This script is Copyright (C) 2015-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/87351 title Amazon Linux AMI : openssh (ALAS-2015-625) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2015-2088.NASL description Updated openssh packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD last seen 2020-06-01 modified 2020-06-02 plugin id 86967 published 2015-11-20 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/86967 title RHEL 7 : openssh (RHSA-2015:2088) NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2016-0741.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 found that the OpenSSH client did not properly enforce the ForwardX11Timeout setting. 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-2015-5352) * A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) * A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) * 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) For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.8 Release Notes and Red Hat Enterprise Linux 6.8 Technical Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 91166 published 2016-05-17 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/91166 title CentOS 6 : openssh (CESA-2016:0741) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-1544-1.NASL description openssh was updated to fix several security issues. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. (bsc#943010) - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. (bsc#943006) Also use %restart_on_update in the trigger script. 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 85928 published 2015-09-14 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/85928 title SUSE SLED12 / SLES12 Security Update : openssh (SUSE-SU-2015:1544-1) (Logjam) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-1695-1.NASL description OpenSSH was updated to fix several security issues and bugs. Please note that due to a bug in the previous shipped openssh version, sshd might not correctly restart. Please verify that the ssh daemon is running after installing this update. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function, when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window. (bsc#936695) - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list. (bsc#938746) - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM. (bsc#932483) - Hardening patch to fix sftp RCE. (bsc#903649) - CVE-2015-6563: The monitor component in sshd accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. Additional a bug was fixed that could lead to openssh not working in chroot (bsc#947458). 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 86339 published 2015-10-12 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/86339 title SUSE SLED11 / SLES11 Security Update : openssh (SUSE-SU-2015:1695-1) (Logjam) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2016-0741.NASL description From Red Hat Security Advisory 2016:0741 : 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 found that the OpenSSH client did not properly enforce the ForwardX11Timeout setting. 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-2015-5352) * A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) * A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) * 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) For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.8 Release Notes and Red Hat Enterprise Linux 6.8 Technical Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 91148 published 2016-05-16 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/91148 title Oracle Linux 6 : openssh (ELSA-2016-0741) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201512-04.NASL description The remote host is affected by the vulnerability described in GLSA-201512-04 (OpenSSH: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in OpenSSH. Please review the CVE identifiers referenced below for details. Impact : Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 87545 published 2015-12-22 reporter This script is Copyright (C) 2015 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/87545 title GLSA-201512-04 : OpenSSH: Multiple vulnerabilities NASL family MacOS X Local Security Checks NASL id MACOSX_10_11_1.NASL description The remote host is running a version of Mac OS X that is 10.9.5 or later but prior to 10.11.1 It is, therefore, affected by multiple vulnerabilities in the following components : - Accelerate Framework (CVE-2015-5940) - apache_mod_php (CVE-2015-0235, CVE-2015-0273, CVE-2015-6834, CVE-2015-6835, CVE-2015-6836, CVE-2015-6837, CVE-2015-6838) - ATS (CVE-2015-6985) - Audio (CVE-2015-5933, CVE-2015-5934, CVE-2015-7003) - Bom (CVE-2015-7006) - CFNetwork (CVE-2015-7023) - configd (CVE-2015-7015) - CoreGraphics (CVE-2015-5925, CVE-2015-5926) - CoreText (CVE-2015-5944, CVE-2015-6975, CVE-2015-6992, CVE-2015-7017) - Directory Utility (CVE-2015-6980) - Disk Images (CVE-2015-6995) - EFI (CVE-2015-7035) - File Bookmark (CVE-2015-6987) - FontParser (CVE-2015-5927, CVE-2015-5942, CVE-2015-6976, CVE-2015-6977, CVE-2015-6978, CVE-2015-6990, CVE-2015-6991, CVE-2015-6993, CVE-2015-7008, CVE-2015-7009, CVE-2015-7010, CVE-2015-7018) - Grand Central Dispatch (CVE-2015-6989) - Graphics Drivers (CVE-2015-7019, CVE-2015-7020, CVE-2015-7021) - ImageIO (CVE-2015-5935, CVE-2015-5936, CVE-2015-5937, CVE-2015-5938, CVE-2015-5939) - IOAcceleratorFamily (CVE-2015-6996) - IOHIDFamily (CVE-2015-6974) - Kernel (CVE-2015-5932, CVE-2015-6988, CVE-2015-6994) - libarchive (CVE-2015-6984) - MCX Application Restrictions (CVE-2015-7016) - Net-SNMP (CVE-2014-3565, CVE-2012-6151) - OpenGL (CVE-2015-5924) - OpenSSH (CVE-2015-6563) - Sandbox (CVE-2015-5945) - Script Editor (CVE-2015-7007) - Security (CVE-2015-6983, CVE-2015-7024) - SecurityAgent (CVE-2015-5943) Note that successful exploitation of the most serious issues can result in arbitrary code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 86654 published 2015-10-29 reporter This script is Copyright (C) 2015-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/86654 title Mac OS X < 10.11.1 Multiple Vulnerabilities NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-1547-1.NASL description openssh was updated to fix several security issues and bugs. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. 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 85929 published 2015-09-14 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/85929 title SUSE SLES11 Security Update : openssh (SUSE-SU-2015:1547-1) (Logjam) NASL family Amazon Linux Local Security Checks NASL id ALA_ALAS-2015-592.NASL description The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. (CVE-2015-6563) Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. (CVE-2015-6564) last seen 2020-06-01 modified 2020-06-02 plugin id 85750 published 2015-09-03 reporter This script is Copyright (C) 2015-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/85750 title Amazon Linux AMI : openssh (ALAS-2015-592)
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References
- https://github.com/openssh/openssh-portable/commit/d4697fe9a28dab7255c60433e4dd23cf7fce8a8b
- http://seclists.org/fulldisclosure/2015/Aug/54
- http://www.openwall.com/lists/oss-security/2015/08/22/1
- http://www.openssh.com/txt/release-7.0
- https://support.apple.com/HT205375
- http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://www.securityfocus.com/bid/76317
- https://security.gentoo.org/glsa/201512-04
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
- http://rhn.redhat.com/errata/RHSA-2016-0741.html
- https://security.netapp.com/advisory/ntap-20180201-0002/
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-766
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf