CVE-2020-24659

NameCVE-2020-24659
DescriptionAn issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs969547

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gnutls28 (PTS)bullseye3.7.1-5+deb11u5fixed
bullseye (security)3.7.1-5+deb11u6fixed
bookworm3.7.9-2+deb12u3fixed
sid, trixie3.8.8-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
gnutls28sourcestretch(not affected)
gnutls28sourcebuster3.6.7-4+deb10u7
gnutls28source(unstable)3.6.15-1969547

Notes

[stretch] - gnutls28 <not-affected> (Vulnerable code introduced later)
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04
https://gitlab.com/gnutls/gnutls/-/issues/1071
https://gitlab.com/gnutls/gnutls/-/commit/29ee67c205855e848a0a26e6d0e4f65b6b943e0a
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