CVE-2023-40547
Redhat: CVE-2023-40547 Shim - RCE in HTTP boot support may lead to secure boot bypass
CVE-2023-40547 is fixed in 36 products on 2 platforms, first by shim 15.8-0ubuntu1, released January 22, 2024. It is not reported as exploited. Patch Radar priority: Urgent.
UrgentFixed on 2 platforms
CVSS
8.3
Critical
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0542
92nd percentile
A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| Windows 10 Version 1607 for 32-bit Systems | 14393.7259 | KB5041773 | Aug 13, 2024 |
| Windows 10 Version 1607 for x64-based Systems | 14393.7259 | KB5041773 | Aug 13, 2024 |
| Windows 10 Version 1809 for 32-bit Systems | 17763.6189 | KB5041578 | Aug 13, 2024 |
| Windows 10 Version 1809 for x64-based Systems | 17763.6189 | KB5041578 | Aug 13, 2024 |
| Windows 10 Version 21H2 for 32-bit Systems | KB5041580 | Aug 13, 2024 | |
| Windows 10 Version 21H2 for ARM64-based Systems | KB5041580 | Aug 13, 2024 | |
| Windows 10 Version 21H2 for x64-based Systems | KB5041580 | Aug 13, 2024 | |
| Windows 10 Version 22H2 for 32-bit Systems | KB5041580 | Aug 13, 2024 | |
| Windows 10 Version 22H2 for ARM64-based Systems | KB5041580 | Aug 13, 2024 | |
| Windows 10 Version 22H2 for x64-based Systems | KB5041580 | Aug 13, 2024 | |
| Windows 10 for 32-bit Systems | 10240.20751 | KB5041782 | Aug 13, 2024 |
| Windows 10 for x64-based Systems | 10240.20751 | KB5041782 | Aug 13, 2024 |
| Windows 11 Version 22H2 for ARM64-based Systems | KB5041585 | Aug 13, 2024 | |
| Windows 11 Version 22H2 for x64-based Systems | KB5041585 | Aug 13, 2024 | |
| Windows 11 Version 23H2 for ARM64-based Systems | KB5041585 | Aug 13, 2024 | |
| Windows 11 Version 23H2 for x64-based Systems | KB5041585 | Aug 13, 2024 | |
| Windows 11 Version 24H2 for ARM64-based Systems | 26100.1457 | KB5041571 | Aug 13, 2024 |
| Windows 11 Version 24H2 for x64-based Systems | 26100.1457 | KB5041571 | Aug 13, 2024 |
| Windows 11 version 21H2 for ARM64-based Systems | 22000.3147 | KB5041592 | Aug 13, 2024 |
| Windows 11 version 21H2 for x64-based Systems | 22000.3147 | KB5041592 | Aug 13, 2024 |
| Windows Server 2012 | KB5041851 | Aug 13, 2024 | |
| Windows Server 2012 (Server Core installation) | KB5041851 | Aug 13, 2024 | |
| Windows Server 2012 R2 | KB5041828 | Aug 13, 2024 | |
| Windows Server 2012 R2 (Server Core installation) | KB5041828 | Aug 13, 2024 | |
| Windows Server 2016 | 14393.7259 | KB5041773 | Aug 13, 2024 |
| Windows Server 2016 (Server Core installation) | 14393.7259 | KB5041773 | Aug 13, 2024 |
| Windows Server 2019 | 17763.6189 | KB5041578 | Aug 13, 2024 |
| Windows Server 2019 (Server Core installation) | 17763.6189 | KB5041578 | Aug 13, 2024 |
| Windows Server 2022 | 20348.2655 | KB5041160 | Aug 13, 2024 |
| Windows Server 2022 (Server Core installation) | 20348.2655 | KB5041160 | Aug 13, 2024 |
| Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1085 | KB5041573 | Aug 13, 2024 |
| Linux | |||
| shim · Debian 12.15 (bookworm) | 15.8-1~deb12u1 | DEBIAN-CVE-2023-40547 | Jan 25, 2024 |
| shim · Debian 13.5 (trixie) | 15.8-1 | DEBIAN-CVE-2023-40547 | Jan 25, 2024 |
| shim · Debian 14 | 15.8-1 | DEBIAN-CVE-2023-40547 | Jan 25, 2024 |
| shim · Ubuntu 20.04 LTS (focal) | 15.8-0ubuntu1 | shim 15.8-0ubuntu1 | Jan 22, 2024 |
| shim · Ubuntu 22.04.1 LTS (jammy) | 15.8-0ubuntu1 | shim 15.8-0ubuntu1 | Jan 22, 2024 |
| shim · Ubuntu 24.04.5 LTS (noble) | 15.8-0ubuntu1 | shim 15.8-0ubuntu1 | Jan 22, 2024 |
| shim · Ubuntu 24.10 (oracular) | 15.8-0ubuntu1 | shim 15.8-0ubuntu1 | Jan 23, 2024 |
| shim · Ubuntu 25.04 (plucky) | 15.8-0ubuntu1 | shim 15.8-0ubuntu1 | Jan 23, 2024 |
| shim-aa64 · RHEL 8 | 0:15.8-4.el8_9 | RHSA-2024:1902 | Apr 18, 2024 |
| shim-aa64 · RHEL 9 | 0:15.8-4.el9_3 | RHSA-2024:1903 | Apr 18, 2024 |
| shim-aa64 · almalinux 8 | 15.8-4.el8_9.alma.1 | ALSA-2024:1902 | Apr 18, 2024 |
| shim-aa64 · almalinux 9 | 15.8-4.el9_3.alma.1 | ALSA-2024:1903 | Apr 18, 2024 |
| shim-aa64 · ol 8 | 0:15.8-4.0.1.el8 | ELSA-2024-1902 | Apr 25, 2024 |
| shim-aa64 · ol 9 | 0:15.8-1.0.3.el9 | ELSA-2024-1903 | Apr 22, 2024 |
| shim-ia32 · RHEL 8 | 0:15.8-4.el8_9 | RHSA-2024:1902 | Apr 18, 2024 |
| shim-ia32 · almalinux 8 | 15.8-4.el8_9.alma.1 | ALSA-2024:1902 | Apr 18, 2024 |
| shim-ia32 · ol 8 | 0:15.8-4.0.1.el8 | ELSA-2024-1902 | Apr 25, 2024 |
| shim-signed · Ubuntu 20.04 LTS (focal) | 1.40.10+15.8-0ubuntu1 | shim-signed 1.40.10+15.8-0ubuntu1 | Jan 22, 2024 |
| shim-signed · Ubuntu 22.04.1 LTS (jammy) | 1.51.4+15.8-0ubuntu1 | shim-signed 1.51.4+15.8-0ubuntu1 | Jan 22, 2024 |
| shim-signed · Ubuntu 24.04.5 LTS (noble) | 1.58+15.8-0ubuntu1 | shim-signed 1.58+15.8-0ubuntu1 | Jan 22, 2024 |
| shim-signed · Ubuntu 24.10 (oracular) | 1.58+15.8-0ubuntu1 | shim-signed 1.58+15.8-0ubuntu1 | Jan 23, 2024 |
| shim-signed · Ubuntu 25.04 (plucky) | 1.58 | shim-signed 1.58 | Jan 23, 2024 |
| shim-x64 · RHEL 8 | 0:15.8-4.el8_9 | RHSA-2024:1902 | Apr 18, 2024 |
| shim-x64 · RHEL 9 | 0:15.8-4.el9_3 | RHSA-2024:1903 | Apr 18, 2024 |
| shim-x64 · almalinux 8 | 15.8-4.el8_9.alma.1 | ALSA-2024:1902 | Apr 18, 2024 |
| shim-x64 · almalinux 9 | 15.8-4.el9_3.alma.1 | ALSA-2024:1903 | Apr 18, 2024 |
| shim-x64 · ol 8 | 0:15.8-4.0.1.el8 | ELSA-2024-1902 | Apr 25, 2024 |
| shim-x64 · ol 9 | 0:15.8-1.0.3.el9 | ELSA-2024-1903 | Apr 22, 2024 |
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