CVE - CVE-2023-39950

CVE-ID
CVE-2023-39950	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
efibootguard is a simple UEFI boot loader with support for safely switching between current and updated partition sets. Insufficient or missing validation and sanitization of input from untrustworthy bootloader environment files can cause crashes and probably also code injections into `bg_setenv`) or programs using `libebgenv`. This is triggered when the affected components try to modify a manipulated environment, in particular its user variables. Furthermore, `bg_printenv` may crash over invalid read accesses or report invalid results. Not affected by this issue is EFI Boot Guard's bootloader EFI binary. EFI Boot Guard release v0.15 contains required patches to sanitize and validate the bootloader environment prior to processing it in userspace. Its library and tools should be updated, so should programs statically linked against it. An update of the bootloader EFI executable is not required. The only way to prevent the issue with an unpatched EFI Boot Guard version is to avoid accesses to user variables, specifically modifications to them.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://github.com/siemens/efibootguard/blob/master/docs/API.md URL:https://github.com/siemens/efibootguard/blob/master/docs/API.md MISC:https://github.com/siemens/efibootguard/blob/master/docs/TOOLS.md URL:https://github.com/siemens/efibootguard/blob/master/docs/TOOLS.md MISC:https://github.com/siemens/efibootguard/blob/master/docs/TOOLS.md#setting-user-variables URL:https://github.com/siemens/efibootguard/blob/master/docs/TOOLS.md#setting-user-variables MISC:https://github.com/siemens/efibootguard/security/advisories/GHSA-j6pp-7g99-24m7 URL:https://github.com/siemens/efibootguard/security/advisories/GHSA-j6pp-7g99-24m7 MISC:https://github.com/siemens/efibootguard/tags URL:https://github.com/siemens/efibootguard/tags
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20230807	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20230807)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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