CVE-2020-7463 : Security Advisory and Response

In FreeBSD 12.1-STABLE before r364644, 11.4-STABLE before r364651, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, a use-after-free vulnerability exists due to improper handling in the kernel. This can be triggered by sending large user messages from multiple threads on the same SCTP socket, potentially leading to unintended kernel behavior, including a kernel panic.

Understanding CVE-2020-7463

This CVE involves a use-after-free vulnerability in FreeBSD systems.

What is CVE-2020-7463?

CVE-2020-7463 is a use-after-free vulnerability in FreeBSD that arises from improper kernel handling when large user messages are sent from multiple threads on the same SCTP socket.

The Impact of CVE-2020-7463

The use-after-free scenario can result in unintended kernel behavior, potentially causing a kernel panic and compromising system stability.

Technical Details of CVE-2020-7463

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in FreeBSD allows for a use-after-free bug triggered by specific actions on the SCTP socket, potentially leading to a kernel panic.

Affected Systems and Versions

FreeBSD 12.1-RELEASE before p9
FreeBSD 11.4-RELEASE before p3
FreeBSD 11.3-RELEASE before p13

Exploitation Mechanism

The vulnerability can be exploited by sending large user messages from multiple threads on the same SCTP socket, causing the use-after-free bug.

Mitigation and Prevention

Protecting systems from CVE-2020-7463 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply the necessary patches provided by FreeBSD to address the vulnerability.
Monitor security advisories for updates and follow best practices for secure system configuration.

Long-Term Security Practices

Regularly update and patch FreeBSD systems to mitigate known vulnerabilities.
Implement network segmentation and access controls to limit potential attack surfaces.

Patching and Updates

Ensure that FreeBSD systems are updated to versions that include the patches for CVE-2020-7463 to prevent exploitation and enhance system security.