CVE-2018-1000156 Explained : Impact and Mitigation

GNU Patch version 2.7.6 contains an input validation vulnerability that can lead to code execution when processing patch files. This vulnerability is similar to FreeBSD's CVE-2015-1418.

Understanding CVE-2018-1000156

What is CVE-2018-1000156?

The input validation flaw in GNU Patch version 2.7.6 allows for potential code execution during the processing of patch files, specifically through the invocation of the EDITOR_PROGRAM using ed.

The Impact of CVE-2018-1000156

This vulnerability can be exploited by using a patch file with the patch utility, potentially leading to code execution. Although similar to FreeBSD's CVE-2015-1418, the code bases of these systems have evolved separately over time.

Technical Details of CVE-2018-1000156

Vulnerability Description

The vulnerability in GNU Patch version 2.7.6 arises from an input validation issue when processing patch files, particularly in the invocation of the EDITOR_PROGRAM using ed, which can result in code execution.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Version: 2.7.6

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious patch file and using the patch utility to process it, potentially allowing an attacker to execute arbitrary code.

Mitigation and Prevention

Immediate Steps to Take

Apply security updates provided by the vendor promptly.
Avoid processing untrusted patch files.

Long-Term Security Practices

Regularly update software and apply patches to address known vulnerabilities.
Implement proper input validation mechanisms to prevent code execution through patch files.

Patching and Updates

Ensure that the GNU Patch software is updated to a patched version that addresses the input validation vulnerability.