GSS-NTLMSSP up to 1.1.x NTLM Authentication gss_accept_sec_context memory leak

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

Summaryinfo

A vulnerability has been found in GSS-NTLMSSP up to 1.1.x and classified as problematic. This issue affects the function gss_accept_sec_context of the component NTLM Authentication. Performing a manipulation results in memory leak. This vulnerability is cataloged as CVE-2023-25566. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in GSS-NTLMSSP up to 1.1.x. This affects the function gss_accept_sec_context of the component NTLM Authentication. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. The summary by CVE is:

GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, a memory leak can be triggered when parsing usernames which can trigger a denial-of-service. The domain portion of a username may be overridden causing an allocated memory area the size of the domain name to be leaked. An attacker can leak memory via the main `gss_accept_sec_context` entry point, potentially causing a denial-of-service. This issue is fixed in version 1.2.0.

The weakness was shared 02/14/2023 as GHSA-mfm4-6g58-jw74. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-25566 since 02/07/2023. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.2.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 8660fb16474054e692a596e9c79670cd4d3954f4 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 vulnerability database at CERT Bund (WID-SEC-2023-1238). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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: Memory leak
CWE: CWE-401 / 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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: GSS-NTLMSSP 1.2.0
Patch: 8660fb16474054e692a596e9c79670cd4d3954f4

Timelineinfo

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

Sourcesinfo

Advisory: GHSA-mfm4-6g58-jw74
Status: Confirmed

CVE: CVE-2023-25566 (🔍)
GCVE (CVE): GCVE-0-2023-25566
GCVE (VulDB): GCVE-100-221049
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), 01/04/2026 03:05 (22)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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