CVE-2023-3724

Name	CVE-2023-3724
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1041699

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
wolfssl (PTS)	bullseye	4.6.0+p1-0+deb11u2	vulnerable
	bookworm	5.5.4-2+deb12u1	fixed
	sid, trixie	5.6.6-1.3	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
wolfssl	source	bookworm	5.5.4-2+deb12u1
wolfssl	source	(unstable)	5.5.4-2.1			1041699

Notes

[bullseye] - wolfssl <no-dsa> (Minor issue)
https://github.com/wolfSSL/wolfssl/pull/6412
https://github.com/wolfSSL/wolfssl/commit/00f1eddee429ff51390b20caadd2eb6afe51e1aa (v5.6.2-stable)