NA

CVE-2023-3724

Published: 17/07/2023 Updated: 28/07/2023
CVSS v3 Base Score: 8.8 | Impact Score: 5.9 | Exploitability Score: 2.8
VMScore: 0

Vulnerability Summary

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. 

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Vendor Advisories

Debian Bug report logs - #1041699 wolfssl: CVE-2023-3724 Package: src:wolfssl; Maintainer for src:wolfssl is Jacob Barthelmeh <sirkilamole@msncom>; Reported by: Moritz Mühlenhoff <jmm@inutilorg> Date: Sat, 22 Jul 2023 12:03:02 UTC Severity: important Tags: security, upstream Forwarded to githubcom/wol ...