Description
It was found that the GnuTLS implementation of HMAC-SHA-256 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data using crafted packets.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| [UNKNOWN] | gnutls | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnutls28 | 3.5.19-1 | — |
| Debian 13 | gnutls28 | 3.5.19-1 | — |
| Debian 12 | gnutls28 | 3.5.19-1 | — |
| Debian 8 | gnutls28 | 3.3.30-0+deb8u1 | DLA-1560-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | gnutls28 | 3.5.18-1ubuntu1.1 | USN-3999-1 |
| Ubuntu 16.04 LTS | gnutls28 | 3.4.10-4ubuntu1.5 | USN-3999-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | gnutls26 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | gnutls +4 | 3.3.29-8.el7 | RHSA-2018:3050 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | gnutls | 3.6.2-6.3.1 | SUSE-SU-2018:2930-1 |
| SLES 12 SP3 | gnutls | 3.3.27-3.3.1 | SUSE-SU-2018:2842-1 |
| SLES 12 SP2 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-2, SUSE-SU-2018:2825-1 |
| SLES 12 SP1 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SLES 12 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | gnutls | 3.3.27-3.3.1 | SUSE-SU-2018:2842-1 |
| SLES for SAP 12 SP2 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SLES for SAP 12 SP1 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SUSE OpenStack Cloud 7 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
| SUSE Enterprise Storage 4 | gnutls | 3.2.15-18.6.1 | SUSE-SU-2018:2825-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | gnutls +4 | 3.3.29-8.amzn2 | ALAS2-2018-1120 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | gnutls +4 | 3.3.29-8.0.1.el7 | ELSA-2018-3050 |
Advisories 10
- WID-SEC-2026-3119 GnuTLS: Mehrere Schwachstellen ermöglichen Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Aug 31, 2026
- RHSA-2018:3050 Red Hat Security Advisory: gnutls security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3999-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-1560-1 gnutls28 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:2825-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2825-2 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2842-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2930-1 Security update for gnutls SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2018-1120 Moderate: gnutls security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 8, 2018
- ELSA-2018-3050 Moderate: gnutls security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 5, 2018
References
- https://eprint.iacr.org/2018/747
- https://gitlab.com/gnutls/gnutls/merge_requests/657
- RHSA-2018:3505 vendor-advisory
- 105138 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10844
- RHSA-2018:3050 vendor-advisory
- [debian-lts-announce] 20181030 [SECURITY] [DLA 1560-1] gnutls28 security update mailing-list
- USN-3999-1 vendor-advisory
- FEDORA-2020-f90fb78f70 vendor-advisory
- FEDORA-2020-d14280a6e8 vendor-advisory