CVE-2021-36087 : Vulnerability Insights and Analysis

The CIL compiler in SELinux 3.2 is impacted by a heap-based buffer over-read vulnerability in ebitmap_match_any, which is indirectly invoked from cil_check_neverallow. The vulnerability arises due to the absence of checks for invalid statements within an optional block.

Understanding CVE-2021-36087

This section provides insights into the CVE-2021-36087 vulnerability.

What is CVE-2021-36087?

The CIL compiler in SELinux 3.2 suffers from a heap-based buffer over-read issue, leading to a security vulnerability when processing certain statements.

The Impact of CVE-2021-36087

The impact of this CVE includes the potential for exploitation by malicious actors to gain unauthorized access or perform denial of service attacks.

Technical Details of CVE-2021-36087

Explore the technical aspects of CVE-2021-36087 below.

Vulnerability Description

The vulnerability in SELinux 3.2 involves a heap-based buffer over-read in ebitmap_match_any, triggered indirectly via cil_check_neverallow.

Affected Systems and Versions

SELinux version 3.2 is affected by this vulnerability, potentially impacting systems utilizing this specific version.

Exploitation Mechanism

The lack of proper checks for invalid statements in an optional block allows threat actors to exploit this vulnerability.

Mitigation and Prevention

Learn how to protect your systems against CVE-2021-36087.

Immediate Steps to Take

Immediate steps include applying patches provided by the vendor or security updates to mitigate the vulnerability.

Long-Term Security Practices

Incorporate secure coding practices, regular security audits, and employee training to enhance overall cybersecurity resilience.

Patching and Updates

Regularly check for security updates and patches from SELinux to address CVE-2021-36087 and other potential vulnerabilities.