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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-24609
• https://www.rambus.com/security/software-protocols/tls-toolkit/
• https://www.telekom.com/en/company/data-privacy-and-security/news/advisories-504842