CVE-2023-39969 uthenticode signature validation bypass vulnerability
Attackers can modify binary code without invalidating the Authenticode signature due to incorrect hashing logic in the uthenticode library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-39969?
CVE-2023-39969 is a critical vulnerability in trailofbits uthenticode, published on 9 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2023-39969?
It affects 1 product.
Products include Trailofbits Uthenticode.
How do I fix CVE-2023-39969?
No fix has been published for CVE-2023-39969 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-39969 being exploited?
There is no known exploitation of CVE-2023-39969 in the wild and no public exploit code.
Other vulnerabilities in trailofbits uthenticode
Sources
Also known as GHSA-rc7g-99x7-4p9g.