What’s Vulnerable › Vulnerabilities

CVE-2018-10844

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-08-22 · updated 2026-06-17
• Weakness: CWE-385

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

• Canonical Ubuntu Linux: 16.04, 18.04, 18.10, 19.04
• Debian Linux: 8.0
• Fedoraproject Fedora: 31, 32
• [UNKNOWN] gnutls: before 3.6.12 — fixed in 3.6.12
• RedHat Enterprise Linux Desktop: 7.0
• RedHat Enterprise Linux Server: 7.0
• RedHat Enterprise Linux Workstation: 7.0

How to fix

Upgrade to a fixed version: [UNKNOWN] gnutls 3.6.12. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/105138
• https://access.redhat.com/errata/RHSA-2018:3050
• https://access.redhat.com/errata/RHSA-2018:3505
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10844
• https://eprint.iacr.org/2018/747
• https://gitlab.com/gnutls/gnutls/merge_requests/657
• https://lists.debian.org/debian-lts-announce/2018/10/msg00022.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/
• https://usn.ubuntu.com/3999-1/
• http://www.securityfocus.com/bid/105138
• https://access.redhat.com/errata/RHSA-2018:3050

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