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CVE-2023-25563

5.9 · MEDIUM

GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication.

Published Feb 14, 2023CWE-125EPSS 1.09%

Overview

CVE-2023-25563 is a medium-severity vulnerability. It was published on February 14, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, multiple out-of-bounds reads when decoding NTLM fields can trigger a denial of service. A 32-bit integer overflow condition can lead to incorrect checks of consistency of length of internal buffers. Although most applications will error out before accepting a singe input buffer of 4GB in length this could theoretically happen. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point if the application allows tokens greater than 4GB in length. This can lead to a large, up to 65KB, out-of-bounds read which could cause a denial-of-service if it reads from unmapped memory. Version 1.2.0 contains a patch for the out-of-bounds reads.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/gssapi/gss-ntlmssp/commit/97c62c6167299028d80765080e74d91dfc99efbdGitHubgithub.com/gssapi/gss-ntlmssp/releases/tag/v1.2.0GitHubgithub.com/gssapi/gss-ntlmssp/security/advisories/GHSA-jjjx-5qf7-9mgfGitHubgithub.com/gssapi/gss-ntlmssp/commit/97c62c6167299028d80765080e74d91dfc99efbdGitHubgithub.com/gssapi/gss-ntlmssp/releases/tag/v1.2.0GitHubgithub.com/gssapi/gss-ntlmssp/security/advisories/GHSA-jjjx-5qf7-9mgf

How CyberStrike helps

Frequently asked questions

What is CVE-2023-25563?

CVE-2023-25563 is a medium-severity vulnerability. It was published on February 14, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2023-25563?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-25563?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-25563?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-25563 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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