CVE-2021-38085 : What You Need to Know
Learn about CVE-2021-38085, a privilege escalation vulnerability in Canon TR150 print driver through 3.71.2.10. Understand the impact, affected systems, and mitigation steps.
The Canon TR150 print driver version through 3.71.2.10 is susceptible to a privilege escalation vulnerability that allows a local attacker to escalate privileges by overwriting a specific DLL file. This can lead to the DLL being loaded into a SYSTEM process, resulting in privilege escalation.
Understanding CVE-2021-38085
This section delves into the details of the CVE-2021-38085 vulnerability in the Canon TR150 print driver.
What is CVE-2021-38085?
The CVE-2021-38085 vulnerability involves a privilege escalation issue in the Canon TR150 print driver through version 3.71.2.10. It allows a local attacker to overwrite a DLL file during the add printer process, leading to the escalation of privileges.
The Impact of CVE-2021-38085
The impact of this vulnerability is significant as it enables a local attacker to elevate their privileges on the system by manipulating a specific DLL file. Successful exploitation could result in unauthorized access and control over the affected system.
Technical Details of CVE-2021-38085
This section provides a technical overview of the CVE-2021-38085 vulnerability.
Vulnerability Description
The vulnerability arises due to the Canon TR150 print driver dropping a world-writable DLL into a CanonBJ %PROGRAMDATA% location. This DLL can then be loaded by a system process, leading to privilege escalation.
Affected Systems and Versions
The vulnerability affects Canon TR150 print driver versions through 3.71.2.10.
Exploitation Mechanism
A local attacker can exploit this vulnerability during the add printer process by overwriting the CNMurGE.dll. If timed correctly, the manipulated DLL gets loaded into a system process, allowing for privilege escalation.
Mitigation and Prevention
This section outlines steps to mitigate and prevent exploitation of CVE-2021-38085.
Immediate Steps to Take
Users are advised to update the Canon TR150 print driver to a patched version to eliminate the privilege escalation vulnerability. Additionally, restricting access to system files can help prevent unauthorized modifications.
Long-Term Security Practices
Implementing least privilege access, regular security updates, and monitoring for suspicious activity can enhance the overall security posture and prevent similar vulnerabilities.
Patching and Updates
Regularly check for security updates from Canon and apply patches promptly to address known vulnerabilities and enhance system security.