CVE-2019-13638 : Security Advisory and Response

A vulnerability in GNU patch up to version 2.7.6 allows for OS shell command injection via a maliciously crafted patch file. This CVE is distinct from CVE-2018-1000156.

Understanding CVE-2019-13638

This CVE pertains to a security issue in GNU patch versions up to 2.7.6 that can be exploited through a specific type of payload in a patch file.

What is CVE-2019-13638?

The vulnerability affects versions of GNU patch up to 2.7.6. It can be exploited through a maliciously crafted patch file that contains an ed style diff payload with shell metacharacters. The presence of the ed editor is not required on the vulnerable system.

The Impact of CVE-2019-13638

The vulnerability allows for OS shell command injection, posing a significant security risk to affected systems.

Technical Details of CVE-2019-13638

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability in GNU patch up to 2.7.6 allows for OS shell command injection through a crafted patch file containing specific payload elements.

Affected Systems and Versions

Versions of GNU patch up to 2.7.6

Exploitation Mechanism

Crafted patch file with an ed style diff payload containing shell metacharacters

Mitigation and Prevention

Protecting systems from CVE-2019-13638 requires specific actions to mitigate the risk.

Immediate Steps to Take

Update GNU patch to version 2.7.6 or higher to patch the vulnerability
Avoid applying patches from untrusted sources

Long-Term Security Practices

Regularly update software and apply security patches promptly
Implement file integrity monitoring to detect unauthorized changes

Patching and Updates

Stay informed about security advisories and updates from GNU patch and relevant vendors