Vulnerability Details CVE-2023-39969
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 27.5%
CVSS Severity
CVSS v3 Score 9.0
References
- https://github.com/trailofbits/uthenticode/commit/8670b7bb9154d79c276483dcb7c9e9fd5e66455b
- https://github.com/trailofbits/uthenticode/pull/84
- 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
- https://github.com/trailofbits/uthenticode/security/advisories/GHSA-rc7g-99x7-4p9g
Products affected by CVE-2023-39969
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cpe:2.3:a:trailofbits:uthenticode:1.0.0
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cpe:2.3:a:trailofbits:uthenticode:1.0.1
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cpe:2.3:a:trailofbits:uthenticode:1.0.2
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cpe:2.3:a:trailofbits:uthenticode:1.0.3
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cpe:2.3:a:trailofbits:uthenticode:1.0.4
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cpe:2.3:a:trailofbits:uthenticode:1.0.5
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cpe:2.3:a:trailofbits:uthenticode:1.0.6
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cpe:2.3:a:trailofbits:uthenticode:1.0.7
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cpe:2.3:a:trailofbits:uthenticode:1.0.8