CVE-2021-40393 : Security Advisory and Response

An out-of-bounds write vulnerability exists in the RS-274X aperture macro variables handling functionality of Gerbv 2.7.0 and dev (commit b5f1eacd) and the forked version of Gerbv (commit 71493260). A specially-crafted gerber file can lead to code execution. An attacker can provide a malicious file to trigger this vulnerability.

Understanding CVE-2021-40393

This section provides insight into the details of CVE-2021-40393.

What is CVE-2021-40393?

CVE-2021-40393 is an out-of-bounds write vulnerability in Gerbv software, where a crafted gerber file can trigger code execution.

The Impact of CVE-2021-40393

The vulnerability has a CVSS base score of 10 (Critical) with high impacts on confidentiality, integrity, and availability, allowing remote attackers to execute arbitrary code.

Technical Details of CVE-2021-40393

Explore the technical aspects related to CVE-2021-40393.

Vulnerability Description

The vulnerability involves improper handling of RS-274X aperture macro variables in Gerbv, leading to an out-of-bounds write scenario.

Affected Systems and Versions

Vendor: n/a
Product: Gerbv
Affected Versions:
Gerbv 2.7.0
Gerbv dev (commit b5f1eacd)
Gerbv forked dev (commit 71493260)

Exploitation Mechanism

The vulnerability can be exploited by providing a specially crafted gerber file to trigger the out-of-bounds write, potentially resulting in code execution.

Mitigation and Prevention

Learn about the steps to mitigate and prevent CVE-2021-40393.

Immediate Steps to Take

Update Gerbv software to a patched version.
Avoid opening gerber files from untrusted sources.

Long-Term Security Practices

Regularly update software and apply security patches.
Conduct security assessments and code reviews periodically.

Patching and Updates

Ensure timely installation of security patches and updates released by the software vendor.