Test ID:	1.3.6.1.4.1.25623.1.0.844980
Category:	Ubuntu Local Security Checks
Title:	Ubuntu: Security Advisory (USN-4992-1)
Summary:	The remote host is missing an update for the 'grub2-signed, grub2-unsigned' package(s) announced via the USN-4992-1 advisory.
Description:	Summary: The remote host is missing an update for the 'grub2-signed, grub2-unsigned' package(s) announced via the USN-4992-1 advisory. Vulnerability Insight: Mate Kukri discovered that the acpi command in GRUB 2 allowed privileged users to load crafted ACPI tables when secure boot is enabled. An attacker could use this to bypass UEFI Secure Boot restrictions. (CVE-2020-14372) Chris Coulson discovered that the rmmod command in GRUB 2 contained a use- after-free vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-25632) Chris Coulson discovered that a buffer overflow existed in the command line parser in GRUB 2. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-27749) It was discovered that the cutmem command in GRUB 2 did not honor secure boot locking. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-27779) It was discovered that the option parser in GRUB 2 contained a heap overflow vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20225) It was discovered that the menu rendering implementation in GRUB 2 did not properly calculate the amount of memory needed in some situations, leading to out-of-bounds writes. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20233) Affected Software/OS: 'grub2-signed, grub2-unsigned' package(s) on Ubuntu 18.04, Ubuntu 20.04, Ubuntu 20.10. Solution: Please install the updated package(s). CVSS Score: 7.2 CVSS Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2020-14372 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/ https://security.gentoo.org/glsa/202104-05 https://access.redhat.com/security/vulnerabilities/RHSB-2021-003 https://bugzilla.redhat.com/show_bug.cgi?id=1873150 Common Vulnerability Exposure (CVE) ID: CVE-2020-25632 https://bugzilla.redhat.com/show_bug.cgi?id=1879577 Common Vulnerability Exposure (CVE) ID: CVE-2020-27749 https://bugzilla.redhat.com/show_bug.cgi?id=1899966 Common Vulnerability Exposure (CVE) ID: CVE-2020-27779 https://bugzilla.redhat.com/show_bug.cgi?id=1900698 Common Vulnerability Exposure (CVE) ID: CVE-2021-20225 https://bugzilla.redhat.com/show_bug.cgi?id=1924696 Common Vulnerability Exposure (CVE) ID: CVE-2021-20233 https://bugzilla.redhat.com/show_bug.cgi?id=1926263
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