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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.

Priority

Low

CVSS 3 base score: 5.6

Status

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

precise Ignored
(end of ESM support, was needs-triage)
trusty Needs triage

upstream Needs triage

xenial Does not exist

gnutls28
Launchpad, Ubuntu, Debian
bionic Needed

cosmic Ignored
(reached end-of-life)
disco
Released (3.6.5-2ubuntu1)
eoan
Released (3.6.5-2ubuntu1)
focal
Released (3.6.5-2ubuntu1)
groovy
Released (3.6.5-2ubuntu1)
hirsute
Released (3.6.5-2ubuntu1)
impish
Released (3.6.5-2ubuntu1)
jammy
Released (3.6.5-2ubuntu1)
precise Does not exist

trusty Does not exist
(trusty was needed)
upstream
Released (3.6.5-2)
xenial Needed

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.

References

Bugs