CVE-2023-3724

CVE-2023-3724 · TLS 1.3 client issue handling malicious server when not including a KSE and PSK extension

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

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 9.1 · Critique · EPSS 0,7% · Correctif disponible

Publication

2023-07-17T21:13:10.623Z

Mise à jour

2024-10-29T15:53:43.066Z

Pile logicielle: system

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