CVE-2021-40394 : Exploit Details and Defense Strategies

This CVE-2021-40394 article provides details about an out-of-bounds write vulnerability in Gerbv software.

Understanding CVE-2021-40394

This section will cover what CVE-2021-40394 is and its impact.

What is CVE-2021-40394?

CVE-2021-40394 is an out-of-bounds write vulnerability in the RS-274X aperture macro variables handling functionality of Gerbv 2.7.0 and newer versions. It allows attackers to execute code via a specially-crafted gerber file.

The Impact of CVE-2021-40394

The vulnerability has a CVSS base score of 10.0 (Critical) with high confidentiality, integrity, and availability impact. Attackers can exploit this flaw to execute arbitrary code, posing a significant threat.

Technical Details of CVE-2021-40394

Detailed technical information on the vulnerability.

Vulnerability Description

The vulnerability exists in Gerbv's RS-274X aperture macro variables handling, facilitating out-of-bounds write attacks by processing specially-crafted gerber files.

Affected Systems and Versions

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

Exploitation Mechanism

The attacker provides a malicious gerber file to the vulnerable Gerbv software, triggering the out-of-bounds write vulnerability.

Mitigation and Prevention

Learn how to mitigate and prevent exploitation of CVE-2021-40394.

Immediate Steps to Take

Update Gerbv to the latest version to patch the vulnerability.
Avoid opening gerber files from untrusted or unknown sources.

Long-Term Security Practices

Regularly update software and firmware to prevent known vulnerabilities.
Deploy network intrusion detection systems to detect and block exploit attempts.

Patching and Updates

Apply security updates and patches promptly to protect against the CVE-2021-40394 vulnerability.