CVE-2023-39969 Information

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.

Reference

https://github.com/trailofbits/uthenticode/security/advisories/GHSA-rc7g-99x7-4p9g https://github.com/trailofbits/uthenticode/commit/8670b7bb9154d79c276483dcb7c9e9fd5e66455b https://github.com/trailofbits/uthenticode/pull/84