In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3 handshake. This occurs when an attacker supposedly resumes a previous TLS session. During the resumption Client Hello a Hello Retry Request must be triggered. Both Client Hellos are required to contain a list of duplicate cipher suites to trigger the buffer overflow. In total, two Client Hellos have to be sent: one in the resumed session, and a second one as a response to a Hello Retry Request message.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-39173
• https://github.com/wolfSSL/wolfssl/releases
• https://www.wolfssl.com/docs/security-vulnerabilities/
• http://seclists.org/fulldisclosure/2022/Oct/24
• http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html
• https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/