CVE-2023-25567 : Vulnerability Insights and Analysis

This CVE-2023-25567 involves a vulnerability in the GSS-NTLMSSP container, specifically related to an out-of-bounds read when decoding target information.

Understanding CVE-2023-25567

This vulnerability in the GSS-NTLMSSP container can have significant implications on system security and integrity, especially for versions prior to 1.2.0.

What is CVE-2023-25567?

The vulnerability lies in the GSS-NTLMSSP, a mechglue plugin for the GSSAPI library responsible for implementing NTLM authentication. Prior to version 1.2.0, there is an out-of-bounds read issue when decoding target information. The length of the

av_pair

is not adequately checked for two elements, leading to a potential out-of-bounds read exploit. This exploit can be triggered through the

gss_accept_sec_context

entry point, potentially resulting in a denial-of-service situation if memory is improperly accessed.

The Impact of CVE-2023-25567

With a CVSS v3.1 base score of 7.5 (High Severity), the vulnerability poses a notable threat, particularly in terms of availability impact. While confidentiality and integrity impacts are rated as none, the potential for high availability impact raises concerns for affected systems.

Technical Details of CVE-2023-25567

Understanding the technical aspects of the vulnerability is crucial for effectively addressing and mitigating the risks associated with CVE-2023-25567.

Vulnerability Description

The vulnerability in GSS-NTLMSSP stems from an out-of-bounds read issue during the decoding of target information prior to version 1.2.0. Insufficient checks on the

av_pair

length for specific elements create a scenario where an out-of-bounds read can be triggered, potentially leading to unauthorized access and exploitation.

Affected Systems and Versions

The vulnerability impacts versions of the gss-ntlmssp container that are earlier than 1.2.0. Systems running these affected versions are at risk of exploitation and should take immediate action to mitigate the vulnerability.

Exploitation Mechanism

The exploit can be activated through the main

gss_accept_sec_context

entry point. By leveraging the inadequately checked

av_pair

length, threat actors can trigger an out-of-bounds read, potentially leading to a denial-of-service scenario and jeopardizing system stability.

Mitigation and Prevention

Addressing CVE-2023-25567 requires a comprehensive approach to mitigate the identified vulnerability and enhance the overall security posture of affected systems.

Immediate Steps to Take

Update the gss-ntlmssp container to version 1.2.0 or later to ensure the vulnerability is remediated.
Implement network security measures to restrict unauthorized access and reduce the risk of exploitation.

Long-Term Security Practices

Regularly monitor for security updates and patches from the software provider to address potential vulnerabilities promptly.
Conduct thorough security assessments and audits to identify and remediate any existing or emerging security gaps within the system.

Patching and Updates

Ensure timely application of patches and updates provided by gssapi for the gss-ntlmssp container to address known vulnerabilities and enhance system security. Regularly review and adhere to best practices for secure software deployment and maintenance.