CVE-2020-28007 : Vulnerability Insights and Analysis

Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges, posing a critical security risk.

Understanding CVE-2020-28007

Exim vulnerability allowing symlink or hard link attacks to overwrite critical root-owned files.

What is CVE-2020-28007?

Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges, enabling attackers to overwrite critical root-owned files.

The Impact of CVE-2020-28007

Attackers can exploit Exim's root privileges in the log directory to compromise the entire filesystem.

Technical Details of CVE-2020-28007

Exim vulnerability details and affected systems.

Vulnerability Description

Exim 4 before 4.94.2 allows symlink or hard link attacks, leading to unauthorized file overwrites.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions: N/A

Exploitation Mechanism

Attackers can create symbolic or hard links to overwrite critical root-owned files due to Exim operating as root in a non-root user-owned log directory.

Mitigation and Prevention

Protecting systems from CVE-2020-28007.

Immediate Steps to Take

Update Exim to version 4.94.2 or newer to mitigate the vulnerability.
Implement file system permissions to restrict unauthorized access.

Long-Term Security Practices

Regularly monitor and audit file system changes for unauthorized modifications.
Follow the principle of least privilege to limit the impact of potential attacks.

Patching and Updates

Apply security patches promptly to address known vulnerabilities like CVE-2020-28007.