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CVE-2023-39969— uthenticode signature validation bypass vulnerability

Quick assessment

Affected
trailofbits uthenticode
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

uthenticode是Trail of Bits开源的一个小型跨平台库。用于部分验证 Authenticode 数字签名。 uthenticode 1.0.9版本存在数据伪造问题漏洞，该漏洞源于允许攻击者在不更改Authenticode哈希值的前提下修改二进制文件中的代码。

CVSS 9.1 · Critical EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass
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I. Basic Information for CVE-2023-39969

Vulnerability Information
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Vulnerability Title
uthenticode signature validation bypass vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures. Version 1.0.9 of uthenticode hashed the entire file rather than hashing sections by virtual address, in violation of the Authenticode specification. As a result, an attacker could modify code within a binary without changing its Authenticode hash, making it appear valid from uthenticode's perspective. Versions of uthenticode prior to 1.0.9 are not vulnerable to this attack, nor are versions in the 2.x series. By design, uthenticode does not perform full-chain validation. However, the malleability of signature verification introduced in 1.0.9 was an unintended oversight. The 2.x series addresses the vulnerability. Versions prior to 1.0.9 are also not vulnerable, but users are encouraged to upgrade rather than downgrade. There are no workarounds to this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
uthenticode 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
uthenticode是Trail of Bits开源的一个小型跨平台库。用于部分验证 Authenticode 数字签名。 uthenticode 1.0.9版本存在数据伪造问题漏洞，该漏洞源于允许攻击者在不更改Authenticode哈希值的前提下修改二进制文件中的代码。
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
trailofbits uthenticode = 1.0.9 -

II. Public POCs for CVE-2023-39969

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8756 chars
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III. Intelligence Information for CVE-2023-39969

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Patches & Fixes for CVE-2023-39969 (2)

Vendor Advisories for CVE-2023-39969 (1)

IV. Related Vulnerabilities

Same product: uthenticode
Same vendor: trailofbits
Same weakness: CWE-347

V. Comments for CVE-2023-39969

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