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Ubuntu.comUB:CVE-2023-5981

HistoryNov 17, 2023 - 12:00 a.m.

CVE-2023-5981

2023-11-1700:00:00

ubuntu.com

rsa-psk clientkeyexchange

malformed ciphertexts

pkcs#1 v1.5 padding

gnutls

backport patch

cve-2018-16868

cve-2018-16869

xenial

nettle

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

5.5 Medium

AI Score

Confidence

High

2.6 Low

CVSS2

Access Vector

NETWORK

Access Complexity

HIGH

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:H/Au:N/C:P/I:N/A:N

0.001 Low

EPSS

Percentile

41.2%

JSON

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.

Bugs

<https://gitlab.com/gnutls/gnutls/-/issues/1511>

Notes

Author	Note
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.

Author

Note

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.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchgnutls28< 3.5.18-1ubuntu1.6+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu20.04noarchgnutls28< 3.6.13-2ubuntu1.9UNKNOWN
ubuntu22.04noarchgnutls28< 3.7.3-4ubuntu1.3UNKNOWN
ubuntu23.04noarchgnutls28< 3.7.8-5ubuntu1.1UNKNOWN
ubuntu23.10noarchgnutls28< 3.8.1-4ubuntu1.1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	gnutls28	< 3.5.18-1ubuntu1.6+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	20.04	noarch	gnutls28	< 3.6.13-2ubuntu1.9	UNKNOWN
ubuntu	22.04	noarch	gnutls28	< 3.7.3-4ubuntu1.3	UNKNOWN
ubuntu	23.04	noarch	gnutls28	< 3.7.8-5ubuntu1.1	UNKNOWN
ubuntu	23.10	noarch	gnutls28	< 3.8.1-4ubuntu1.1	UNKNOWN