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CVE-2023-5981

Published: 17 November 2023

A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.

Notes

AuthorNote
ccdm94
in order to backport the patch for this CVE for xenial and earlier
it is necessary to also include the changes from commit 4804febdd,
which is also the fix for CVE-2018-16868, due to the use of function
'gnutls_privkey_decrypt_data2' in the patch. However, to successfully
add the fix for CVE-2018-16868 it is required that the patch for
CVE-2018-16869 also be applied to nettle, which is not possible for
xenial and earlier due to it being too intrusive. Therefore, it will
not be possible to patch CVE-2023-5981 in xenial and earlier because
it would also be considered too intrusive in this case.

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
gnutls28
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
xenial Ignored
(change too intrusive)
bionic
Released (3.5.18-1ubuntu1.6+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (3.6.13-2ubuntu1.9)
upstream
Released (3.8.2)
jammy
Released (3.7.3-4ubuntu1.3)
lunar
Released (3.7.8-5ubuntu1.1)
mantic
Released (3.8.1-4ubuntu1.1)
Patches:
upstream: https://gitlab.com/gnutls/gnutls/-/merge_requests/1787/diffs?commit_id=29d6298d0b04cfff970b993915db71ba3f580b6d

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