| Name | CVE-2020-24659 |
| Description | An 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. |
| 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 | 969547 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| gnutls28 (PTS) | jessie, jessie (lts) | 3.3.30-0+deb8u2 | fixed |
| stretch (security) | 3.5.8-5+deb9u6 | fixed |
| stretch (lts), stretch | 3.5.8-5+deb9u7 | fixed |
| buster (security), buster, buster (lts) | 3.6.7-4+deb10u12 | fixed |
| bullseye | 3.7.1-5+deb11u5 | fixed |
| bullseye (security) | 3.7.1-5+deb11u6 | fixed |
| bookworm | 3.7.9-2+deb12u3 | fixed |
| sid, trixie | 3.8.8-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| gnutls28 | source | jessie | (not affected) | | | |
| gnutls28 | source | stretch | (not affected) | | | |
| gnutls28 | source | buster | 3.6.7-4+deb10u7 | | | |
| gnutls28 | source | (unstable) | 3.6.15-1 | | | 969547 |
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
[jessie] - gnutls28 <not-affected> (TLS 1.3 support introduced in 3.6.x)