CVE-2020-7458 : Security Advisory and Response

In FreeBSD 12.1-STABLE before r362281, 11.4-STABLE before r362281, and 11.4-RELEASE before p1, a vulnerability exists that could lead to arbitrary code execution due to a buffer overflow in the posix_spawnp function.

Understanding CVE-2020-7458

This CVE identifies a security issue in FreeBSD versions that could allow an attacker to execute arbitrary code.

What is CVE-2020-7458?

CVE-2020-7458 is a buffer overflow vulnerability in FreeBSD versions 12.1-STABLE, 11.4-STABLE, and 11.4-RELEASE before p1, triggered by long values in the user-controlled PATH environment variable.

The Impact of CVE-2020-7458

The vulnerability could potentially allow an attacker to execute arbitrary code by exploiting the buffer overflow in the posix_spawnp function.

Technical Details of CVE-2020-7458

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue arises from long values in the user-controlled PATH environment variable causing posix_spawnp to write beyond the end of the heap allocated stack, leading to a buffer overflow.

Affected Systems and Versions

FreeBSD 12.1-STABLE before r362281
FreeBSD 11.4-STABLE before r362281
FreeBSD 11.4-RELEASE before p1

Exploitation Mechanism

The vulnerability can be exploited by manipulating the PATH environment variable to trigger the buffer overflow in the posix_spawnp function.

Mitigation and Prevention

Protecting systems from CVE-2020-7458 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply the necessary patches provided by FreeBSD to address the vulnerability.
Monitor for any signs of exploitation or unauthorized access.

Long-Term Security Practices

Regularly update and patch FreeBSD systems to prevent known vulnerabilities.
Implement proper input validation and boundary checks in code to mitigate buffer overflow risks.
Conduct security audits and assessments to identify and address potential security weaknesses.
Stay informed about security advisories and updates from FreeBSD.

Patching and Updates

FreeBSD has released patches to fix the vulnerability. Ensure that systems are updated to the latest patched versions to mitigate the risk of exploitation.