GSS-NTLMSSP up to 1.1.x NTLM Authentication gss_accept_sec_context cb/sh denial of service

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in GSS-NTLMSSP up to 1.1.x. This vulnerability affects the function gss_accept_sec_context of the component NTLM Authentication. Such manipulation of the argument cb/sh leads to denial of service. This vulnerability is listed as CVE-2023-25565. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in GSS-NTLMSSP up to 1.1.x. It has been rated as problematic. Affected by this issue is the function gss_accept_sec_context of the component NTLM Authentication. The manipulation of the argument cb/sh with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

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.

The weakness was presented 02/14/2023 as GHSA-7q7f-wqcg-mvfg. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2023-25565 since 02/07/2023. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 240491 (Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS : GSS NTLMSSP vulnerabilities (USN-7588-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.2.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch c16100f60907a2de92bcb676f303b81facee0f64 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (240491) and CERT Bund (WID-SEC-2023-1238). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Oracle Linux
  • Red Hat Enterprise Linux
  • RESF Rocky Linux

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 240491
Nessus Name: Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS : GSS NTLMSSP vulnerabilities (USN-7588-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: GSS-NTLMSSP 1.2.0
Patch: c16100f60907a2de92bcb676f303b81facee0f64

Timelineinfo

02/07/2023 🔍
02/14/2023 +7 days 🔍
02/14/2023 +0 days 🔍
01/04/2026 +1055 days 🔍

Sourcesinfo

Advisory: GHSA-7q7f-wqcg-mvfg
Status: Confirmed

CVE: CVE-2023-25565 (🔍)
GCVE (CVE): GCVE-0-2023-25565
GCVE (VulDB): GCVE-100-221048
CERT Bund: WID-SEC-2023-1238 - Red Hat Enterprise Linux: Mehrere Schwachstellen in verschiedenen Komponenten

Entryinfo

Created: 02/14/2023 21:09
Updated: 01/04/2026 03:05
Changes: 02/14/2023 21:09 (54), 03/15/2023 23:58 (1), 06/26/2025 19:40 (17), 01/04/2026 03:05 (7)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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