CVE-2023-3724
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.
- Affected products
- Wolfssl
- Wolfssl
- < 5.6.2
- Fix
- Available
- CVSS 3.1
- 9.1 CRITICAL
- EPSS
- 0.7% (48th percentile)
- Weakness
- CWE-295, CWE-20
- NVD status
- Modified
- Published
- 2023-07-17
Fix
Fixed in the following GitHub pull request https://github.com/wolfSSL/wolfssl/pull/6412 https://github.com/wolfSSL/wolfssl/pull/6412
No indexed exploits for CVE-2023-3724 yet
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No exploit for CVE-2023-3724 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.