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.
References (10)
Core 10
Core References
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202004-06
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://gitlab.com/gnutls/gnutls/-/issues/960
Patch, Third Party Advisory x_refsource_misc
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2
Vendor Advisory x_refsource_misc
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2020/dsa-4652
Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20200416-0002/
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4322-1/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/
Scores
CVSS v3
7.4
EPSS
0.0339
EPSS Percentile
87.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Details
CWE
CWE-330
Status
published
Products (6)
canonical/ubuntu_linux
19.10
debian/debian_linux
10.0
fedoraproject/fedora
31
fedoraproject/fedora
32
gnu/gnutls
3.6.3 - 3.6.13
opensuse/leap
15.1
Published
Apr 03, 2020
Tracked Since
Feb 18, 2026