CVE-2023-25565

Publication date 14 February 2023

Last updated 24 June 2025

Ubuntu priority

Cvss 3 Severity Score

Description

GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, an incorrect free when decoding target information can trigger a denial of service. The error condition incorrectly assumes the `cb` and `sh` buffers contain a copy of the data that needs to be freed. However, that is not the case. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point. This will likely trigger an assertion failure in `free`, causing a denial-of-service. This issue is fixed in version 1.2.0.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gss-ntlmssp	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 needs-triage
	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