Test ID:	1.3.6.1.4.1.25623.1.1.12.2023.6355.1
Category:	Ubuntu Local Security Checks
Title:	Ubuntu: Security Advisory (USN-6355-1)
Summary:	The remote host is missing an update for the 'grub2-signed, grub2-unsigned, shim, shim-signed' package(s) announced via the USN-6355-1 advisory.
Description:	Summary: The remote host is missing an update for the 'grub2-signed, grub2-unsigned, shim, shim-signed' package(s) announced via the USN-6355-1 advisory. Vulnerability Insight: Daniel Axtens discovered that specially crafted images could cause a heap-based out-of-bonds write. A local attacker could possibly use this to circumvent secure boot protections. (CVE-2021-3695) Daniel Axtens discovered that specially crafted images could cause out-of-bonds read and write. A local attacker could possibly use this to circumvent secure boot protections. (CVE-2021-3696) Daniel Axtens discovered that specially crafted images could cause buffer underwrite which allows arbitrary data to be written to a heap. A local attacker could possibly use this to circumvent secure boot protections. (CVE-2021-3697) It was discovered that GRUB2 configuration files were created with the wrong permissions. An attacker could possibly use this to leak encrypted passwords. (CVE-2021-3981) Daniel Axtens discovered that specially crafted IP packets could cause an integer underflow and write past the end of a buffer. An attacker could possibly use this to circumvent secure boot protections. (CVE-2022-28733) Daniel Axtens discovered that specially crafted HTTP headers can cause an out-of-bounds write of a NULL byte. An attacker could possibly use this to corrupt GRUB2's internal data. (CVE-2022-28734) Julian Andres Klode discovered that GRUB2 shim_lock allowed non- kernel files to be loaded. A local attack could possibly use this to circumvent secure boot protections. (CVE-2022-28735) Chris Coulson discovered that executing chainloaders more than once caused a use-after-free vulnerability. A local attack could possibly use this to circumvent secure boot protections. (CVE-2022-28736) Chris Coulson discovered that specially crafted executables could cause shim to make out-of-bound writes. A local attack could possibly use this to circumvent secure boot protections. (CVE-2022-28737) Zhang Boyang discovered that specially crafted unicode sequences could lead to an out-of-bounds write to a heap. A local attacker could possibly use this to circumvent secure boot protections. (CVE-2022-3775) Affected Software/OS: 'grub2-signed, grub2-unsigned, shim, shim-signed' package(s) on Ubuntu 20.04, Ubuntu 22.04. Solution: Please install the updated package(s). CVSS Score: 6.9 CVSS Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2021-3695 https://security.gentoo.org/glsa/202209-12 https://bugzilla.redhat.com/show_bug.cgi?id=1991685 Common Vulnerability Exposure (CVE) ID: CVE-2021-3696 https://bugzilla.redhat.com/show_bug.cgi?id=1991686 Common Vulnerability Exposure (CVE) ID: CVE-2021-3697 https://bugzilla.redhat.com/show_bug.cgi?id=1991687 Common Vulnerability Exposure (CVE) ID: CVE-2021-3981 FEDORA-2021-73d63662b0 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AI776L35DDYPCSAAJPJM3ZEQYSFZHBJX/ GLSA-202209-12 https://bugzilla.redhat.com/show_bug.cgi?id=2024170 http://www.openwall.com/lists/oss-security/2024/01/15/3 Common Vulnerability Exposure (CVE) ID: CVE-2022-28733 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733 https://www.openwall.com/lists/oss-security/2022/06/07/5 Common Vulnerability Exposure (CVE) ID: CVE-2022-28734 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28734 Common Vulnerability Exposure (CVE) ID: CVE-2022-28735 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28735 Common Vulnerability Exposure (CVE) ID: CVE-2022-28736 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28736 Common Vulnerability Exposure (CVE) ID: CVE-2022-28737 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28737 Common Vulnerability Exposure (CVE) ID: CVE-2022-3775 https://security.gentoo.org/glsa/202311-14 https://access.redhat.com/security/cve/cve-2022-3775
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