Vulnerability Description
If a TLS 1.3 client gets neither a PSK (pre shared key) extension nor a KSE (key share extension) when connecting to a malicious server, a default predictable buffer gets used for the IKM (Input Keying Material) value when generating the session master secret. Using a potentially known IKM value when generating the session master secret key compromises the key generated, allowing an eavesdropper to reconstruct it and potentially allowing access to or meddling with message contents in the session. This issue does not affect client validation of connected servers, nor expose private key information, but could result in an insecure TLS 1.3 session when not controlling both sides of the connection. wolfSSL recommends that TLS 1.3 client side users update the version of wolfSSL used.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wolfssl | Wolfssl | < 5.6.2 |
Related Weaknesses (CWE)
References
- https://github.com/wolfSSL/wolfssl/pull/6412Patch
- https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
- https://github.com/wolfSSL/wolfssl/pull/6412Patch
- https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
FAQ
What is CVE-2023-3724?
CVE-2023-3724 is a vulnerability with a CVSS score of 9.1 (CRITICAL). If a TLS 1.3 client gets neither a PSK (pre shared key) extension nor a KSE (key share extension) when connecting to a malicious server, a default predictable buffer gets used for the IKM (Input Keyin...
How severe is CVE-2023-3724?
CVE-2023-3724 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2023-3724?
Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.