CVE-2023-5981

Publication date 17 November 2023

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gnutls28	23.10 mantic	Fixed 3.8.1-4ubuntu1.1
	23.04 lunar	Fixed 3.7.8-5ubuntu1.1
	22.04 LTS jammy	Fixed 3.7.3-4ubuntu1.3
	20.04 LTS focal	Fixed 3.6.13-2ubuntu1.9
	18.04 LTS bionic	Fixed 3.5.18-1ubuntu1.6+esm1 Ubuntu Pro
	16.04 LTS xenial	Ignored change too intrusive
	14.04 LTS trusty	Ignored end of standard support

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Notes

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.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
gnutls28	Upstream: https://gitlab.com/gnutls/gnutls/-/merge_requests/1787/diffs?commit_id=29d6298d0b04cfff970b993915db71ba3f580b6d

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
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