CVE-2021-26736 Explained : Impact and Mitigation
Learn about the privilege escalation vulnerabilities in Zscaler's ZApp Installer for Windows pre-version 3.6, enabling local adversaries to execute code with SYSTEM privileges. Find mitigation steps and long-term security practices.
Multiple vulnerabilities in the Zscaler Client Connector Installer and Uninstaller for Windows prior to version 3.6 allowed execution of binaries from a low privileged path, potentially enabling a local adversary to execute code with SYSTEM privileges.
Understanding CVE-2021-26736
This CVE details privilege escalation vulnerabilities in Zscaler's Client Connector Installer and Uninstaller for Windows.
What is CVE-2021-26736?
CVE-2021-26736 involves multiple vulnerabilities in the Zscaler Client Connector Installer and Uninstaller that could be exploited by a local adversary to execute code with SYSTEM privileges.
The Impact of CVE-2021-26736
The impact of these vulnerabilities is significant, as they could allow malicious actors to escalate privileges and execute arbitrary code with high system-level permissions.
Technical Details of CVE-2021-26736
This section provides insights into the vulnerability description, affected systems and versions, as well as the exploitation mechanism.
Vulnerability Description
The vulnerabilities in the Zscaler Client Connector Installer and Uninstaller for Windows prior to version 3.6 enabled the execution of binaries from a low privileged path, posing a privilege escalation risk.
Affected Systems and Versions
The affected product is Zscaler's Client Connector for Windows version less than 3.6.
Exploitation Mechanism
A local adversary could exploit these vulnerabilities to execute code with SYSTEM privileges, potentially leading to unauthorized system access.
Mitigation and Prevention
To protect systems from CVE-2021-26736, it is crucial to take immediate steps and implement long-term security practices while ensuring timely patching and updates.
Immediate Steps to Take
Update the Zscaler Client Connector to version 3.6 or above, restrict user privileges, and monitor system activities for any suspicious behavior.
Long-Term Security Practices
Implement the principle of least privilege, conduct regular security audits, and educate users on safe computing practices to mitigate future risks.
Patching and Updates
Stay informed about security advisories from Zscaler, apply patches promptly, and maintain proactive monitoring of system vulnerabilities and exploits.