USN-6355-1

Dashboard / Vulnerabilities / USN-6355-1

USN-6355-1

Summary: grub2-signed, grub2-unsigned, shim, and shim-signed vulnerability

Details: 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)

References: https://ubuntu.com/security/notices/USN-6355-1, https://ubuntu.com/security/CVE-2021-3695, https://ubuntu.com/security/CVE-2021-3696, https://ubuntu.com/security/CVE-2021-3697, https://ubuntu.com/security/CVE-2021-3981, https://ubuntu.com/security/CVE-2022-3775, https://ubuntu.com/security/CVE-2022-28733, https://ubuntu.com/security/CVE-2022-28734, https://ubuntu.com/security/CVE-2022-28735, https://ubuntu.com/security/CVE-2022-28736, https://ubuntu.com/security/CVE-2022-28737, https://launchpad.net/bugs/2029518