CVE-2021-45337 : Vulnerability Insights and Analysis
Learn about CVE-2021-45337, a privilege escalation vulnerability in the Self-Defense driver of Avast Antivirus. Find out about impacted versions, exploitation risks, and mitigation steps.
A privilege escalation vulnerability in the Self-Defense driver of Avast Antivirus could allow a local user to gain elevated privileges.
Understanding CVE-2021-45337
What is CVE-2021-45337?
The vulnerability in Avast Antivirus prior to version 20.8 enables a local user with SYSTEM privileges to escalate their privileges through a specific process, potentially compromising antimalware protection.
The Impact of CVE-2021-45337
The vulnerability can lead to privilege escalation for a local user with SYSTEM privileges, potentially bypassing security measures intended to protect the system.
Technical Details of CVE-2021-45337
Vulnerability Description
The vulnerability in the Self-Defense driver allows a local user to elevate their privileges by manipulating the process wsc_proxy.exe.
Affected Systems and Versions
- Avast Antivirus versions prior to 20.8
Exploitation Mechanism
The vulnerability is exploited through 'hollowing' the process wsc_proxy.exe, enabling the attacker to gain elevated privileges.
Mitigation and Prevention
Immediate Steps to Take
- Update Avast Antivirus to version 20.8 or newer.
- Monitor and restrict access to the vulnerable system to trusted users.
Long-Term Security Practices
- Regularly update antivirus software and perform system scans.
- Implement the principle of least privilege to restrict user access.
Patching and Updates
Apply security patches and updates promptly to ensure vulnerabilities like CVE-2021-45337 are mitigated.