CVE-2021-29627 : Vulnerability Insights and Analysis

In FreeBSD 13.0-STABLE before n245050, 12.2-STABLE before r369525, 13.0-RC4 before p0, and 12.2-RELEASE before p6, a vulnerability exists where listening socket accept filters incorrectly freed a process supplied argument string, leading to a potential double free or use after free issue.

Understanding CVE-2021-29627

This CVE affects FreeBSD versions that have specific conditions met where an attacker could potentially exploit the system.

What is CVE-2021-29627?

The vulnerability occurs due to incorrect handling of process supplied argument strings in listening socket accept filters, potentially resulting in a double free or use after free scenario.

The Impact of CVE-2021-29627

Exploitation of this vulnerability could allow an attacker to execute arbitrary code, crash the system, or perform other malicious activities, posing a serious security risk to affected systems.

Technical Details of CVE-2021-29627

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

The vulnerability exists in the FreeBSD operating system, specifically in how listening socket accept filters handle process supplied argument strings, leading to a double free or use after free condition.

Affected Systems and Versions

FreeBSD 13.0-STABLE before n245050, 12.2-STABLE before r369525, 13.0-RC4 before p0, and 12.2-RELEASE before p6 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted requests to target systems, triggering the improper handling of socket filters and potentially leading to malicious code execution.

Mitigation and Prevention

To address CVE-2021-29627 and enhance system security, follow these measures:

Immediate Steps to Take

Apply the necessary patches provided by FreeBSD to fix the vulnerability.
Monitor system logs for any suspicious activities that may indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update and patch the FreeBSD operating system to address known vulnerabilities and enhance overall security.
Implement network segmentation and access controls to minimize the attack surface.

Patching and Updates

Stay informed about security advisories and updates released by FreeBSD to quickly apply patches for known vulnerabilities and ensure system protection.