Skip to content
Fencer Intel
medium 5.9

CVE-2018-10844 json

It was found that the GnuTLS implementation of HMAC-SHA-256 was vulnerable to a Lucky thirteen style attack.

published 8y ago modified 4mo ago also EUVD-2018-2913

cvss
5.9
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • gnu gnutls 3.6.12
  • gnutls28 Debian 14, Debian 13, Debian 12 3.5.19-1

debian advisories DEBIAN-CVE-2018-10844

  • gnutls28 Ubuntu 16.04 LTS 3.4.10-4ubuntu1.5
  • gnutls28 Ubuntu 18.04 LTS 3.5.18-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2018-10844

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gnutls RHEL 7 3.3.29-8.el7
  • gnutls-c++ RHEL 7 3.3.29-8.el7
  • gnutls-dane RHEL 7 3.3.29-8.el7
  • gnutls-utils RHEL 7 3.3.29-8.el7

red hat advisories RHSA-2018:3050

  • gnutls SLES 12 SP2-BCL, OpenStack Cloud 7, Enterprise Storage 4 +5 more 3.2.15-18.6.1
  • gnutls SLE Module for Desktop Applications 15, SLE Module for Basesystem 15 3.6.2-6.3.1
  • gnutls SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 3.3.27-3.3.1

suse advisories SUSE-SU-2018:2825-2SUSE-SU-2018:2930-1SUSE-SU-2018:2842-1SUSE-SU-2018:2825-1

Is CVE-2018-10844 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-10844 updated cvss 5.9

gnutls: HMAC-SHA-256 vulnerable to Lucky thirteen attack due to not enough dummy function calls

  • Red Hat Enterprise Linux 5 gnutls Red Hat Enterprise Linux 6 gnutls, gnutls-guile, gnutls-utils
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) gnutls 3.3.29-8.el7, gnutls-dane 3.3.29-8.el7, gnutls-utils 3.3.29-8.el7 Red Hat Enterprise Linux Client Optional (v. 7) gnutls-c++ 3.3.29-8.el7 Red Hat Enterprise Linux ComputeNode (v. 7) gnutls 3.3.29-8.el7, gnutls-dane 3.3.29-8.el7, gnutls-utils 3.3.29-8.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) gnutls-c++ 3.3.29-8.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) gnutls 3.3.29-8.el7, gnutls-c++ 3.3.29-8.el7, gnutls-dane 3.3.29-8.el7, gnutls-utils 3.3.29-8.el7 Red Hat Enterprise Linux Server (v. 7) gnutls 3.3.29-8.el7, gnutls-c++ 3.3.29-8.el7, gnutls-dane 3.3.29-8.el7, gnutls-utils 3.3.29-8.el7
    +1 more products
    Red Hat Enterprise Linux Workstation (v. 7) gnutls 3.3.29-8.el7, gnutls-c++ 3.3.29-8.el7, gnutls-dane 3.3.29-8.el7, gnutls-utils 3.3.29-8.el7
    fixed: vendor fix RHSA-2018:3050
  • Red Hat Enterprise Linux 8 gnutls, gnutls-c++, gnutls-dane, gnutls-utils, mingw-gnutls, mingw32-gnutls, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.61% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • [UNKNOWN] gnutls

Classification

Weakness
  • CWE-385 Covert Timing Channel
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.