CVE-2021-26936 Explained : Impact and Mitigation

ReplaySorcery version 0.4.0 through 0.5.0 is vulnerable to privilege escalation through the replay-sorcery program when configured with setuid-root, enabling a local attacker to gain root privileges by specifying video output paths in privileged locations.

Understanding CVE-2021-26936

This CVE identifies a privilege escalation vulnerability in ReplaySorcery versions 0.4.0 through 0.5.0.

What is CVE-2021-26936?

The vulnerability in the replay-sorcery program in ReplaySorcery versions 0.4.0 through 0.5.0, when using the default setuid-root configuration, allows a local attacker to escalate privileges to root by specifying video output paths in privileged locations.

The Impact of CVE-2021-26936

Exploitation of this vulnerability could result in a local attacker gaining root privileges on the affected system, potentially leading to unauthorized access and control over the system.

Technical Details of CVE-2021-26936

This section will delve into the specifics of the vulnerability, including its description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The replay-sorcery program in ReplaySorcery versions 0.4.0 through 0.5.0, with the default setuid-root configuration, enables local attackers to escalate privileges to root by specifying video output paths in privileged locations.

Affected Systems and Versions

ReplaySorcery versions 0.4.0 through 0.5.0 are impacted by this privilege escalation vulnerability when configured with setuid-root.

Exploitation Mechanism

By manipulating video output paths in specific locations, local attackers can exploit the vulnerability to elevate their privileges to root.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-26936, immediate steps can be taken along with adopting long-term security practices and ensuring timely patching and updates.

Immediate Steps to Take

Administrators are advised to update ReplaySorcery to a non-vulnerable version, restrict access to sensitive directories, and monitor system logs for any suspicious activities.

Long-Term Security Practices

Implement least privilege principles, perform regular security audits, educate users on secure practices, and consider security enhancements or alternatives to vulnerable software.

Patching and Updates

Stay informed about security advisories, promptly apply patches released by software vendors, and maintain a proactive approach towards system security.