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CVE-2018-16868

Published: 3 December 2018

A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the victim process, could use this to extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.

Notes

AuthorNote
mdeslaur
Fixing this requires fixing CVE-2018-16869 in nettle first, but
nettle changes are too intrusive to backport to stable releases.
In addition, the upstream gnutls28 fix appears to break OpenPGP
support when backported to the version in bionic.

Priority

Low

Cvss 3 Severity Score

5.6

Score breakdown

Status

Package Release Status
gnutls26
Launchpad, Ubuntu, Debian
groovy Does not exist

jammy Does not exist

kinetic Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

trusty Ignored
(change too intrusive)
upstream Needs triage

xenial Does not exist

lunar Does not exist

gnutls28
Launchpad, Ubuntu, Debian
groovy
Released (3.6.5-2ubuntu1)
jammy
Released (3.6.5-2ubuntu1)
kinetic
Released (3.6.5-2ubuntu1)
bionic Ignored
(change too intrusive)
cosmic Ignored
(end of life)
disco
Released (3.6.5-2ubuntu1)
eoan
Released (3.6.5-2ubuntu1)
focal
Released (3.6.5-2ubuntu1)
hirsute
Released (3.6.5-2ubuntu1)
impish
Released (3.6.5-2ubuntu1)
lunar
Released (3.6.5-2ubuntu1)
trusty Does not exist
(trusty was needed)
upstream
Released (3.6.5-2)
xenial Ignored
(change too intrusive)
Patches:
upstream: https://gitlab.com/gnutls/gnutls/commit/4804febddc2ed958e5ae774de2a8f85edeeff538 (3.6)
upstream: https://gitlab.com/gnutls/gnutls/commit/ed3bdddab73c792364deec423b2c2c498a939a64 (3.6)

Severity score breakdown

Parameter Value
Base score 5.6
Attack vector Physical
Attack complexity High
Privileges required Low
User interaction None
Scope Changed
Confidentiality High
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N