CVE-2023-6937

Description

wolfSSL prior to 5.6.6 did not check that messages in one (D)TLS record do not span key boundaries. As a result, it was possible to combine (D)TLS messages using different keys into one (D)TLS record. The most extreme edge case is that, in (D)TLS 1.3, it was possible that an unencrypted (D)TLS 1.3 record from the server containing first a ServerHello message and then the rest of the first server flight would be accepted by a wolfSSL client. In (D)TLS 1.3 the handshake is encrypted after the ServerHello but a wolfSSL client would accept an unencrypted flight from the server. This does not compromise key negotiation and authentication so it is assigned a low severity rating.

Reserved 2023-12-18 | Published 2024-02-15 | Updated 2024-08-02 | Assigner wolfSSL

Problem types

CWE-20 Improper Input Validation

Product status

Default status
unaffected

Any version
affected

Credits

Johannes Wilson from Sectra Communications and Linköping University finder

References

github.com/wolfSSL/wolfssl/pull/7029 patch

www.wolfssl.com/docs/security-vulnerabilities/ vendor-advisory

cve.org (CVE-2023-6937)

nvd.nist.gov (CVE-2023-6937)

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