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CVE-2023-39950— Insufficient input validation in efibootguard

Quick assessment

Affected
siemens efibootguard
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Siemens EFI Boot Guard是德国西门子（Siemens）公司的一个简单的 UEFI 引导加载程序。 Siemens EFI Boot Guard 0.15之前版本存在输入验证错误漏洞，该漏洞源于输入验证和清理不充分，从而导致系统崩溃。

CVSS 6.1 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth
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I. Basic Information for CVE-2023-39950

Vulnerability Information
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Vulnerability Title
Insufficient input validation in efibootguard
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Siemens EFI Boot Guard 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Siemens EFI Boot Guard是德国西门子（Siemens）公司的一个简单的 UEFI 引导加载程序。 Siemens EFI Boot Guard 0.15之前版本存在输入验证错误漏洞，该漏洞源于输入验证和清理不充分，从而导致系统崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siemens efibootguard < 0.15 -

II. Public POCs for CVE-2023-39950

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III. Intelligence Information for CVE-2023-39950

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Vendor Advisories for CVE-2023-39950 (1)

Other References for CVE-2023-39950 (4)

IV. Related Vulnerabilities

Same vendor: siemens
Same weakness: CWE-20

V. Comments for CVE-2023-39950

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