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CVE-2023-40012— uthenticode EKU validation bypass

Quick assessment

Affected
trailofbits uthenticode
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.

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 2.0.0之前版本存在安全漏洞，该漏洞源于未检查证书中的扩展密钥用法，导致攻击者可以绕过EKU验证。

CVSS 5.9 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1610 · Deploy Container
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I. Basic Information for CVE-2023-40012

Vulnerability Information
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Vulnerability Title
uthenticode EKU validation bypass
Source: CVE Program / CVE List V5
Vulnerability Description
uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures. Versions of uthenticode prior to the 2.x series did not check Extended Key Usages in certificates, in violation of the Authenticode X.509 certificate profile. As a result, a malicious user could produce a "signed" PE file that uthenticode would verify and consider valid using an X.509 certificate that isn't entitled to produce code signatures (e.g., a SSL certificate). By design, uthenticode does not perform full-chain validation. However, the absence of EKU validation was an unintended oversight. The 2.0.0 release series includes EKU checks. 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:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缺少必要的密码学步骤
Source: CVE Program / CVE List V5
Vulnerability Title
uthenticode 安全漏洞
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 2.0.0之前版本存在安全漏洞，该漏洞源于未检查证书中的扩展密钥用法，导致攻击者可以绕过EKU验证。
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 < 2.0.0 -

II. Public POCs for CVE-2023-40012

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III. Intelligence Information for CVE-2023-40012

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Patches & Fixes for CVE-2023-40012 (1)

Vendor Advisories for CVE-2023-40012 (1)

IV. Related Vulnerabilities

Same product: uthenticode
Same vendor: trailofbits
Same weakness: CWE-325

V. Comments for CVE-2023-40012

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