CVE-2023-24609: matrixssl Integer Overflow or Wraparound

Vulnerability summary

CVE-2023-24609 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in matrixssl. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.7% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 22-12-2023
   PublishedVulnerability first disclosed.
2. 02-08-2024
   Last modifiedVulnerability information updated.

Description

Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hello Pre-Shared Key extension parsing in the TLS 1.3 server. An attacked device calculates an SHA-2 hash over at least 65 KB (in RAM). With a large number of crafted TLS messages, the CPU becomes heavily loaded. This occurs in tls13VerifyBinder and tls13TranscriptHashUpdate.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.