CVE-2023-25567

Publication date 14 February 2023

Last updated 24 June 2025

Ubuntu priority

Cvss 3 Severity Score

Description

GSS-NTLMSSP, a mechglue plugin for the GSSAPI library that implements NTLM authentication, has an out-of-bounds read when decoding target information prior to version 1.2.0. The length of the `av_pair` is not checked properly for two of the elements which can trigger an out-of-bound read. The out-of-bounds read can be triggered via the main `gss_accept_sec_context` entry point and could cause a denial-of-service if the memory is unmapped. The issue is fixed in version 1.2.0.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gss-ntlmssp	26.04 LTS resolute	Not affected
	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needed
	22.04 LTS jammy	Fixed 0.7.0-4ubuntu0.22.04.1~esm1
	20.04 LTS focal	Fixed 0.7.0-4ubuntu0.20.04.1~esm1
	18.04 LTS bionic	Fixed 0.7.0-4ubuntu0.18.04.1~esm1
	16.04 LTS xenial	Fixed 0.7.0-3~ubuntu0.16.04.1+esm1
	14.04 LTS trusty	Ignored end of standard support

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Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7588-1
GSS NTLMSSP vulnerabilities
23 June 2025