| Name | CVE-2020-11501 |
| Description | GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-4652-1 |
| Debian Bugs | 955556 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| gnutls28 (PTS) | 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.
Notes
[stretch] - gnutls28 <not-affected> (Vulnerable code introduced later)
[jessie] - gnutls28 <not-affected> (Vulnerable code introduced later)
https://gitlab.com/gnutls/gnutls/-/issues/960
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31
Fixed by: https://gitlab.com/gnutls/gnutls/-/commit/c01011c2d8533dbbbe754e49e256c109cb848d0d (3.6.13)
Broken-by: https://gitlab.com/gnutls/gnutls/-/commit/bcf4de0371efbdf0846388e2df0cb14b5db09954 (gnutls_3_6_3)