CVE-2023-25567

GSS-NTLMSSP vulnerable to out-of-bounds read when decoding target information

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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.

A flaw was found in GSS-NTLMSSP, a mechglue plugin for the GSSAPI library that implements NTLM authentication. It has an out-of-bounds read when decoding target information. The length of the `av_pair` is not checked properly for two of the elements, which can trigger an out-of-bounds read via the main `gss_accept_sec_context` entry point and could cause a denial of service if the memory is unmapped.

The gssntlmssp is a GSSAPI NTLM mechanism that allows to perform NTLM authentication in GSSAPI programs. Issues addressed include memory leak and out of bounds read vulnerabilities.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-02-07 CVE Reserved
2023-02-14 CVE Published
2025-03-10 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (5)

URL	Tag	Source
https://github.com/gssapi/gss-ntlmssp/releases/tag/v1.2.0	Third Party Advisory
https://github.com/gssapi/gss-ntlmssp/security/advisories/GHSA-24pf-6prf-24ch	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/gssapi/gss-ntlmssp/commit/025fbb756d44ffee8f847db4222ed6aa4bd1fbe4	2023-02-22

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2023-25567	2023-05-16
https://bugzilla.redhat.com/show_bug.cgi?id=2172023	2023-05-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Gss-ntlmssp Project Search vendor "Gss-ntlmssp Project"		Gss-ntlmssp Search vendor "Gss-ntlmssp Project" for product "Gss-ntlmssp"				< 1.2.0 Search vendor "Gss-ntlmssp Project" for product "Gss-ntlmssp" and version " < 1.2.0"		-		Affected