High · published April 3, 2020
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.
| Product | Versions | Fixed in |
|---|---|---|
| gnu/gnutls | ≥ 3.6.3, < 3.6.13 | 3.6.13 |
| canonical/ubuntu_linux | all versions | — |
| debian/debian_linux | all versions | — |
| opensuse/leap | all versions | — |
| fedoraproject/fedora | all versions | — |
| fedoraproject/fedora | all versions | — |