Vulnerabilities > CVE-2015-8370 - Permissions, Privileges, and Access Controls vulnerability in multiple products
Attack vector
UNKNOWN Attack complexity
UNKNOWN Privileges required
UNKNOWN Confidentiality impact
UNKNOWN Integrity impact
UNKNOWN Availability impact
UNKNOWN Summary
Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 5 | |
| OS | 1 |
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 PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2016-0012_GRUB2.NASL description An update of the grub2 package has been released. last seen 2020-03-17 modified 2019-02-07 plugin id 121648 published 2019-02-07 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/121648 title Photon OS 1.0: Grub2 PHSA-2016-0012 code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from VMware Security Advisory PHSA-2016-0012. The text # itself is copyright (C) VMware, Inc. include('compat.inc'); if (description) { script_id(121648); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2019/02/07"); script_cve_id("CVE-2015-8370"); script_name(english:"Photon OS 1.0: Grub2 PHSA-2016-0012"); script_summary(english:"Checks the rpm output for the updated packages."); script_set_attribute(attribute:"synopsis", value: "The remote PhotonOS host is missing multiple security updates."); script_set_attribute(attribute:"description", value: "An update of the grub2 package has been released."); script_set_attribute(attribute:"see_also", value:"https://github.com/vmware/photon/wiki/Security-Updates-12.md"); script_set_attribute(attribute:"solution", value: "Update the affected Linux packages."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-9555"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2016/12/06"); script_set_attribute(attribute:"patch_publication_date", value:"2016/12/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/07"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:grub2"); script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:photonos:1.0"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"PhotonOS Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/PhotonOS/release", "Host/PhotonOS/rpm-list"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/PhotonOS/release"); if (isnull(release) || release !~ "^VMware Photon") audit(AUDIT_OS_NOT, "PhotonOS"); if (release !~ "^VMware Photon (?:Linux|OS) 1\.0(\D|$)") audit(AUDIT_OS_NOT, "PhotonOS 1.0"); if (!get_kb_item("Host/PhotonOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "PhotonOS", cpu); flag = 0; if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-2.02-5.ph1")) flag++; if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-efi-2.02-3.ph1")) flag++; if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-efi-lang-2.02-3.ph1")) flag++; if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-lang-2.02-5.ph1")) flag++; if (flag) { security_report_v4( port : 0, severity : SECURITY_HOLE, extra : rpm_report_get() ); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "grub2"); }NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2016-0012.NASL description An update of [ linux , wget , vim , grub2 , zookeeper , nginx , dnsmasq , haproxy ] packages for PhotonOS has been released. last seen 2019-02-21 modified 2019-02-07 plugin id 111846 published 2018-08-17 reporter Tenable source https://www.tenable.com/plugins/index.php?view=single&id=111846 title Photon OS 1.0: Dnsmasq / Grub2 / Haproxy / Linux / Nginx / Vim / Wget / Zookeeper PHSA-2016-0012 (deprecated) code # # (C) Tenable Network Security, Inc. # # @DEPRECATED@ # # Disabled on 2/7/2019 # # The descriptive text and package checks in this plugin were # extracted from VMware Security Advisory PHSA-2016-0012. The text # itself is copyright (C) VMware, Inc. include("compat.inc"); if (description) { script_id(111846); script_version("1.3"); script_cvs_date("Date: 2019/04/05 23:25:07"); script_cve_id( "CVE-2015-8370", "CVE-2015-8899", "CVE-2016-1248", "CVE-2016-4450", "CVE-2016-5017", "CVE-2016-5360", "CVE-2016-7098", "CVE-2016-9083", "CVE-2016-9555" ); script_name(english:"Photon OS 1.0: Dnsmasq / Grub2 / Haproxy / Linux / Nginx / Vim / Wget / Zookeeper PHSA-2016-0012 (deprecated)"); script_summary(english:"Checks the rpm output for the updated packages."); script_set_attribute(attribute:"synopsis", value: "This plugin has been deprecated."); script_set_attribute(attribute:"description", value: "An update of [ linux , wget , vim , grub2 , zookeeper , nginx , dnsmasq , haproxy ] packages for PhotonOS has been released."); # https://github.com/vmware/photon/wiki/Security-Updates-12 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b465880d"); script_set_attribute(attribute:"solution", value:"n/a."); script_set_cvss_base_vector("CVSS2#AV:N/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:N/AC:L/PR:N/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:"cvss_score_source", value:"CVE-2016-9555"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"patch_publication_date", value:"2016/12/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/17"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:dnsmasq"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:grub2"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:haproxy"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:linux"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:nginx"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:vim"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:wget"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:zookeeper"); script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:photonos:1.0"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"PhotonOS Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/PhotonOS/release", "Host/PhotonOS/rpm-list"); exit(0); } exit(0, "This plugin has been deprecated."); include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/PhotonOS/release"); if (isnull(release) || release !~ "^VMware Photon") audit(AUDIT_OS_NOT, "PhotonOS"); if (release !~ "^VMware Photon (?:Linux|OS) 1\.0(\D|$)") audit(AUDIT_OS_NOT, "PhotonOS 1.0"); if (!get_kb_item("Host/PhotonOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "PhotonOS", cpu); flag = 0; pkgs = [ "dnsmasq-2.76-1.ph1", "dnsmasq-debuginfo-2.76-1.ph1", "grub2-2.02-5.ph1", "grub2-efi-2.02-3.ph1", "grub2-efi-lang-2.02-3.ph1", "grub2-lang-2.02-5.ph1", "haproxy-1.6.10-1.ph1", "haproxy-debuginfo-1.6.10-1.ph1", "haproxy-doc-1.6.10-1.ph1", "linux-4.4.35-1.ph1", "linux-api-headers-4.4.35-1.ph1", "linux-debuginfo-4.4.35-1.ph1", "linux-dev-4.4.35-1.ph1", "linux-docs-4.4.35-1.ph1", "linux-drivers-gpu-4.4.35-1.ph1", "linux-esx-4.4.35-1.ph1", "linux-esx-debuginfo-4.4.35-1.ph1", "linux-esx-devel-4.4.35-1.ph1", "linux-esx-docs-4.4.35-1.ph1", "linux-oprofile-4.4.35-1.ph1", "linux-sound-4.4.35-1.ph1", "linux-tools-4.4.35-1.ph1", "linux-tools-debuginfo-4.4.35-1.ph1", "nginx-1.10.0-4.ph1", "nginx-debuginfo-1.10.0-4.ph1", "vim-7.4-6.ph1", "vim-extra-7.4-6.ph1", "wget-1.18-1.ph1", "wget-debuginfo-1.18-1.ph1", "zookeeper-3.4.9-1.ph1" ]; foreach (pkg in pkgs) if (rpm_check(release:"PhotonOS-1.0", reference:pkg)) flag++; if (flag) { security_report_v4( port : 0, severity : SECURITY_HOLE, extra : rpm_report_get() ); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "dnsmasq / grub2 / haproxy / linux / nginx / vim / wget / zookeeper"); }NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-2385-1.NASL description This update for grub2 provides the following fixes : A security issues with a bufferoverflow when reading username and password was fixed (bsc#956631, CVE-2015-8370) Also following bugs were fixed : - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) - Add grub.xen config searching path on boot partition. (bsc#884828) - Add linux16 and initrd16 to grub.xen. (bsc#884830) 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 87668 published 2015-12-30 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/87668 title SUSE SLED11 / SLES11 Security Update : grub2 (SUSE-SU-2015:2385-1) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from SUSE update advisory SUSE-SU-2015:2385-1. # The text itself is copyright (C) SUSE. # include("compat.inc"); if (description) { script_id(87668); script_version("2.6"); script_cvs_date("Date: 2019/09/11 11:22:12"); script_cve_id("CVE-2015-8370"); script_name(english:"SUSE SLED11 / SLES11 Security Update : grub2 (SUSE-SU-2015:2385-1)"); script_summary(english:"Checks rpm output for the updated packages."); script_set_attribute( attribute:"synopsis", value:"The remote SUSE host is missing one or more security updates." ); script_set_attribute( attribute:"description", value: "This update for grub2 provides the following fixes : A security issues with a bufferoverflow when reading username and password was fixed (bsc#956631, CVE-2015-8370) Also following bugs were fixed : - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) - Add grub.xen config searching path on boot partition. (bsc#884828) - Add linux16 and initrd16 to grub.xen. (bsc#884830) 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." ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=884828" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=884830" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=946148" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=952539" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=954592" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.suse.com/show_bug.cgi?id=956631" ); script_set_attribute( attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2015-8370/" ); # https://www.suse.com/support/update/announcement/2015/suse-su-20152385-1.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?befd91fa" ); script_set_attribute( attribute:"solution", value: "To install this SUSE Security Update use YaST online_update. Alternatively you can run the command listed for your product : SUSE Linux Enterprise Server 11-SP4 : zypper in -t patch slessp4-grub2-12288=1 SUSE Linux Enterprise Desktop 11-SP4 : zypper in -t patch sledsp4-grub2-12288=1 SUSE Linux Enterprise Debuginfo 11-SP4 : zypper in -t patch dbgsp4-grub2-12288=1 To bring your system up-to-date, use 'zypper patch'." ); 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:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:grub2-x86_64-efi"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:grub2-x86_64-xen"); script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11"); script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/16"); script_set_attribute(attribute:"patch_publication_date", value:"2015/12/29"); script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/30"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"SuSE Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/SuSE/release"); if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE"); os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release); if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE"); os_ver = os_ver[1]; if (! preg(pattern:"^(SLED11|SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED11 / SLES11", "SUSE " + os_ver); if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu); if (cpu >!< "x86_64") audit(AUDIT_ARCH_NOT, "x86_64", cpu); sp = get_kb_item("Host/SuSE/patchlevel"); if (isnull(sp)) sp = "0"; if (os_ver == "SLES11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP4", os_ver + " SP" + sp); if (os_ver == "SLED11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLED11 SP4", os_ver + " SP" + sp); flag = 0; if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-efi-2.00-0.54.2")) flag++; if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-xen-2.00-0.54.2")) flag++; if (rpm_check(release:"SLED11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-efi-2.00-0.54.2")) flag++; if (rpm_check(release:"SLED11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-xen-2.00-0.54.2")) flag++; if (flag) { if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get()); else security_warning(0); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "grub2"); }NASL family Slackware Local Security Checks NASL id SLACKWARE_SSA_2015-351-01.NASL description New grub packages are available for Slackware 14.1 and -current to fix a security issue. last seen 2020-06-01 modified 2020-06-02 plugin id 87477 published 2015-12-18 reporter This script is Copyright (C) 2015 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/87477 title Slackware 14.1 / current : grub (SSA:2015-351-01) NASL family Debian Local Security Checks NASL id DEBIAN_DLA-368.NASL description Hector Marco-Gisbert, from the Universitat Politècnica de València Cybersecurity Team, reported a buffer overflow in grub2 when checking password during bootup. For Debian 6 last seen 2020-03-17 modified 2015-12-14 plugin id 87330 published 2015-12-14 reporter This script is Copyright (C) 2015-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/87330 title Debian DLA-368-1 : grub2 security update NASL family SuSE Local Security Checks NASL id OPENSUSE-2016-10.NASL description - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) - Check MS-DOS header to find PE file header. (bsc#954126) - Use dirname for copying Xen kernel and initrd to esp. (bsc#955493) - Fix reading password by grub2-mkpasswd-pbdk2 without controlling tty. (bsc#954519) - Add luks, gcry_rijndael and gcry_sha1 to signed EFI image to support LUKS partition in default setup. (bsc#917427, bsc#955609) - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) This update was imported from the SUSE:SLE-12-SP1:Update update project. last seen 2020-06-05 modified 2016-01-07 plugin id 87772 published 2016-01-07 reporter This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/87772 title openSUSE Security Update : grub2 (openSUSE-2016-10) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-2836-1.NASL description Hector Marco and Ismael Ripoll discovered that GRUB incorrectly handled the backspace key when configured to use authentication. A local attacker could use this issue to bypass GRUB password protection. 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 87408 published 2015-12-16 reporter Ubuntu Security Notice (C) 2015-2019 Canonical, Inc. / NASL script (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/87408 title Ubuntu 12.04 LTS / 14.04 LTS / 15.04 / 15.10 : grub2 vulnerability (USN-2836-1) NASL family F5 Networks Local Security Checks NASL id F5_BIGIP_SOL25901386.NASL description Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an last seen 2020-06-01 modified 2020-06-02 plugin id 87904 published 2016-01-14 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/87904 title F5 Networks BIG-IP : GRUB2 vulnerability (SOL25901386) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-2399-1.NASL description This update for grub2 provides the following fixes and enhancements : Security issue fixed : - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) Non security issues fixed : - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) - Add --image switch to force zipl update to specific kernel. (bsc#928131) - Do not use shim lock protocol for reading PE header as it won last seen 2020-06-01 modified 2020-06-02 plugin id 87722 published 2016-01-04 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/87722 title SUSE SLED12 / SLES12 Security Update : grub2 (SUSE-SU-2015:2399-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-2387-1.NASL description - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) - Check MS-DOS header to find PE file header. (bsc#954126) - Use dirname for copying Xen kernel and initrd to esp. (bsc#955493) - Fix reading password by grub2-mkpasswd-pbdk2 without controlling tty. (bsc#954519) - Add luks, gcry_rijndael and gcry_sha1 to signed EFI image to support LUKS partition in default setup. (bsc#917427, bsc#955609) - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) 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 87670 published 2015-12-30 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/87670 title SUSE SLED12 / SLES12 Security Update : grub2 (SUSE-SU-2015:2387-1) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-3421.NASL description Hector Marco and Ismael Ripoll, from Cybersecurity UPV Research Group, found an integer underflow vulnerability in Grub2, a popular bootloader. A local attacker can bypass the Grub2 authentication by inserting a crafted input as username or password. More information: http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html CVE-2015-8370 last seen 2020-06-01 modified 2020-06-02 plugin id 87428 published 2015-12-17 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/87428 title Debian DSA-3421-1 : grub2 - security update NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201512-03.NASL description The remote host is affected by the vulnerability described in GLSA-201512-03 (GRUB: Authentication bypass) An integer underflow in GRUB’s username/password authentication code has been discovered. Impact : An attacker with access to the system console may bypass the username prompt by entering a sequence of backspace characters, allowing them e.g. to get full access to GRUB’s console or to load a customized kernel. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 87516 published 2015-12-21 reporter This script is Copyright (C) 2015 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/87516 title GLSA-201512-03 : GRUB: Authentication bypass NASL family Scientific Linux Local Security Checks NASL id SL_20151215_GRUB2_ON_SL7_X.NASL description A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : - When upgrading from Scientific Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file. last seen 2020-03-18 modified 2015-12-22 plugin id 87586 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/87586 title Scientific Linux Security Update : grub2 on SL7.x x86_64 (20151215) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2015-2623.NASL description Updated grub2 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. [Updated 27 January 2016] This advisory has been updated to document additional steps that need to be performed on BIOS-based systems after installing this update. No changes were made to the packages included in the advisory. The grub2 packages provide version 2 of the Grand Unified Bootloader (GRUB), a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : * When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file. (BZ#1290089) All grub2 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For this update to take effect on BIOS-based machines, grub2 needs to be reinstalled as documented in the last seen 2020-06-01 modified 2020-06-02 plugin id 87397 published 2015-12-16 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/87397 title RHEL 7 : grub2 (RHSA-2015:2623) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2015-2623.NASL description From Red Hat Security Advisory 2015:2623 : Updated grub2 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. [Updated 27 January 2016] This advisory has been updated to document additional steps that need to be performed on BIOS-based systems after installing this update. No changes were made to the packages included in the advisory. The grub2 packages provide version 2 of the Grand Unified Bootloader (GRUB), a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : * When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file. (BZ#1290089) All grub2 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For this update to take effect on BIOS-based machines, grub2 needs to be reinstalled as documented in the last seen 2020-06-01 modified 2020-06-02 plugin id 87395 published 2015-12-16 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/87395 title Oracle Linux 7 : grub2 (ELSA-2015-2623) NASL family Fedora Local Security Checks NASL id FEDORA_2015-CEBE5133E7.NASL description Fixes CVE-2015-8370. 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 2016-03-04 plugin id 89415 published 2016-03-04 reporter This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/89415 title Fedora 23 : grub2-2.02-0.25.fc23 (2015-cebe5133e7) NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2015-2623.NASL description Updated grub2 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. [Updated 27 January 2016] This advisory has been updated to document additional steps that need to be performed on BIOS-based systems after installing this update. No changes were made to the packages included in the advisory. The grub2 packages provide version 2 of the Grand Unified Bootloader (GRUB), a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : * When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file. (BZ#1290089) All grub2 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For this update to take effect on BIOS-based machines, grub2 needs to be reinstalled as documented in the last seen 2020-06-01 modified 2020-06-02 plugin id 87422 published 2015-12-17 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/87422 title CentOS 7 : grub2 (CESA-2015:2623) NASL family SuSE Local Security Checks NASL id OPENSUSE-2015-957.NASL description This update for grub2 fixes the following issue : Changes in grub2 : - CVE-2015-8370: Fix for overflow in grub_password_get and grub_user_get functions (bnc#956631) last seen 2020-06-05 modified 2015-12-29 plugin id 87630 published 2015-12-29 reporter This script is Copyright (C) 2015-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/87630 title openSUSE Security Update : grub2 (openSUSE-2015-957) NASL family Solaris Local Security Checks NASL id SOLARIS_JAN2016_SRU11_3_4_5_0.NASL description This Solaris system is missing necessary patches to address critical security updates : - Vulnerability in the Solaris component of Oracle Sun Systems Products Suite (subcomponent: Grub2). The supported version that is affected is 11. Difficult to exploit vulnerability requiring logon to Operating System. Successful attack of this vulnerability can result in unauthorized Operating System takeover including arbitrary code execution. (CVE-2015-8370) - Vulnerability in the Solaris component of Oracle Sun Systems Products Suite (subcomponent: Zones). The supported version that is affected is 11. Easily exploitable vulnerability requiring logon to Operating System plus additional, multiple logins to components. Successful attack of this vulnerability can escalate attacker privileges resulting in unauthorized read access to a subset of Solaris accessible data. (CVE-2016-0618) last seen 2020-06-01 modified 2020-06-02 plugin id 88003 published 2016-01-20 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/88003 title Oracle Solaris Critical Patch Update : jan2016_SRU11_3_4_5_0 NASL family Fedora Local Security Checks NASL id FEDORA_2015-90C27B6E91.NASL description Fixes CVE-2015-8370. 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 2016-03-04 plugin id 89324 published 2016-03-04 reporter This script is Copyright (C) 2016-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/89324 title Fedora 22 : grub2-2.02-0.18.fc22 (2015-90c27b6e91) NASL family SuSE Local Security Checks NASL id SUSE_SU-2015-2386-1.NASL description This update for grub2 provides the following fixes : A security issues with a bufferoverflow when reading username and password was fixed (bsc#956631, CVE-2015-8370) Bugs fixed : - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) - Add grub.xen config searching path on boot partition. (bsc#884828) - Add linux16 and initrd16 to grub.xen. (bsc#884830) 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 87669 published 2015-12-30 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/87669 title SUSE SLED11 / SLES11 Security Update : grub2 (SUSE-SU-2015:2386-1)
Redhat
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The Hacker News
| id | THN:960C1B9817E3CB5C4AF1E8867B27BE72 |
| last seen | 2018-01-27 |
| modified | 2015-12-17 |
| published | 2015-12-16 |
| reporter | Swati Khandelwal |
| source | https://thehackernews.com/2015/12/hack-linux-grub-password.html |
| title | You can Hack into a Linux Computer just by pressing 'Backspace' 28 times |
References
- http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
- http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
- http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
- http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
- http://rhn.redhat.com/errata/RHSA-2015-2623.html
- http://rhn.redhat.com/errata/RHSA-2015-2623.html
- http://seclists.org/fulldisclosure/2015/Dec/69
- http://seclists.org/fulldisclosure/2015/Dec/69
- http://www.debian.org/security/2015/dsa-3421
- http://www.debian.org/security/2015/dsa-3421
- http://www.openwall.com/lists/oss-security/2015/12/15/6
- http://www.openwall.com/lists/oss-security/2015/12/15/6
- http://www.openwall.com/lists/oss-security/2024/01/15/3
- http://www.openwall.com/lists/oss-security/2024/01/15/3
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://www.securityfocus.com/archive/1/537115/100/0/threaded
- http://www.securityfocus.com/archive/1/537115/100/0/threaded
- http://www.securityfocus.com/bid/79358
- http://www.securityfocus.com/bid/79358
- http://www.securitytracker.com/id/1034422
- http://www.securitytracker.com/id/1034422
- http://www.ubuntu.com/usn/USN-2836-1
- http://www.ubuntu.com/usn/USN-2836-1
- https://security.gentoo.org/glsa/201512-03
- https://security.gentoo.org/glsa/201512-03