In Rhonabwy through 1.1.13, HMAC signature verification uses a strcmp function that is vulnerable to side-channel attacks, because it stops the comparison when the first difference is spotted in the two signatures. (The fix uses gnutls_memcmp, which has constant-time execution.)
This Cyber News was published on www.tenable.com. Publication date: Sun, 11 Feb 2024 04:41:03 +0000