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CVE-2018-10844

Published: 22 August 2018

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.

Notes

AuthorNote
mdeslaur
RHEL7 update brings back SHA256

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
gnutls28
Launchpad, Ubuntu, Debian
disco Not vulnerable
(3.6.5-2ubuntu1)
eoan Not vulnerable
(3.6.5-2ubuntu1)
focal Not vulnerable
(3.6.5-2ubuntu1)
hirsute Not vulnerable
(3.6.5-2ubuntu1)
jammy Not vulnerable
(3.6.5-2ubuntu1)
kinetic Not vulnerable
(3.6.5-2ubuntu1)
lunar Not vulnerable
(3.6.5-2ubuntu1)
bionic
Released (3.5.18-1ubuntu1.1)
cosmic Not vulnerable
(3.6.4-2ubuntu1)
groovy Not vulnerable
(3.6.5-2ubuntu1)
impish Not vulnerable
(3.6.5-2ubuntu1)
trusty Does not exist
(trusty was needed)
upstream
Released (3.5.19,3.6.3)
xenial
Released (3.4.10-4ubuntu1.5)
mantic Not vulnerable
(3.6.5-2ubuntu1)
Patches:
upstream: https://gitlab.com/gnutls/gnutls/merge_requests/657
upstream: https://gitlab.com/gnutls/gnutls/commit/e14d85eb8b1987d86f7b1d101a0e7795675d20d4 (3.5)
upstream: https://gitlab.com/gnutls/gnutls/commit/c2e094acd68f7159025b2e2556d6fb4427b41dd7 (3.5)
upstream: https://gitlab.com/gnutls/gnutls/commit/62a39773e9d0c4a686a3d8d2b6cca32f82c26cd7 (3.5)
upstream: https://gitlab.com/gnutls/gnutls/commit/c433cdf92349afae66c703bdacedf987f423605e (3.5)
upstream: https://gitlab.com/gnutls/gnutls/commit/9fdd24d53c84cc68dac1be28f8b1436e424ce1f1 (3.5)
gnutls26
Launchpad, Ubuntu, Debian
hirsute Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

impish Does not exist

trusty Needed

upstream Needs triage

xenial Does not exist

mantic Does not exist

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N