CVE-2021-40400 : What You Need to Know
Learn about CVE-2021-40400, a critical out-of-bounds read vulnerability in Gerbv versions 2.7.0 and dev (commit b5f1eacd). Find out the impact, affected systems, exploitation details, and mitigation steps.
This CVE article provides details about a critical out-of-bounds read vulnerability in Gerbv affecting specific versions.
Understanding CVE-2021-40400
This section delves into the key aspects of the vulnerability.
What is CVE-2021-40400?
CVE-2021-40400 is an out-of-bounds read flaw in the RS-274X aperture macro outline functionality of Gerbv versions 2.7.0 and dev (commit b5f1eacd), as well as the forked Gerbv version (commit d7f42a9a). It allows an attacker to trigger information disclosure via a specially-crafted malicious Gerber file.
The Impact of CVE-2021-40400
The vulnerability has a CVSS base score of 9.3, categorizing it as critical. Details of the impact are as follows:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Confidentiality Impact: Low
- Integrity Impact: None
- Availability Impact: High
Technical Details of CVE-2021-40400
In this section, the technical aspects of the vulnerability are explored.
Vulnerability Description
The vulnerability arises due to improper handling of memory buffers, leading to an out-of-bounds read issue.
Affected Systems and Versions
The following systems and versions are impacted:
- Product: Gerbv
- Affected Versions:
- 2.7.0
- dev (commit b5f1eacd)
- Product: Gerbv forked
- Affected Versions:
- dev (commit d7f42a9a)
Exploitation Mechanism
To exploit this vulnerability, an attacker can provide a specially-crafted Gerber file, triggering the out-of-bounds read condition.
Mitigation and Prevention
This section covers measures to mitigate and prevent exploitation of CVE-2021-40400.
Immediate Steps to Take
- Update Gerbv to a patched version or apply vendor-supplied fixes.
- Exercise caution while handling Gerber files from unknown or untrusted sources.
Long-Term Security Practices
- Regularly update software to address known vulnerabilities.
- Implement network protections like firewalls to prevent unauthorized access.
- Educate users on safe file handling practices.
Patching and Updates
- Stay informed about security advisories and patches issued by Gerbv.
- Apply patches promptly to secure systems against potential exploits.