uthenticode signature validation bypass vulnerability

CVE-2023-39969

What is CVE-2023-39969?

The uthenticode library, which is designed for partially verifying Authenticode digital signatures, has a vulnerability in version 1.0.9. This version erroneously hashes the entire file instead of specific sections by virtual address, breaching the Authenticode specification. Consequently, an attacker could potentially alter the code within a binary while retaining its Authenticode hash, misleading uthenticode into perceiving the modified binary as valid. This vulnerability does not affect uthenticode versions 2.x or earlier versions prior to 1.0.9. It highlights an unintended design flaw in the signature verification process of uthenticode. Users are strongly recommended to update to the latest versions to mitigate any security risks.

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References