CVE-2021-42255 : What You Need to Know

AppGuard Enterprise before 6.7.100.1 creates a Temporary File in a Directory with Insecure Permissions, allowing local users to gain SYSTEM privileges.

Understanding CVE-2021-42255

AppGuard Enterprise vulnerability with insecure file permissions.

What is CVE-2021-42255?

AppGuard Enterprise before version 6.7.100.1 creates temporary files with insecure permissions, enabling local users to elevate privileges to SYSTEM by exploiting the %TEMP% directory.

The Impact of CVE-2021-42255

The vulnerability allows local users to gain escalated privileges within the system, posing a significant security risk.

Technical Details of CVE-2021-42255

Details of the vulnerability in AppGuard Enterprise.

Vulnerability Description

AppGuard Enterprise before 6.7.100.1 creates temporary files with insecure permissions.
Local users can exploit this to gain SYSTEM privileges.

Affected Systems and Versions

Product: AppGuard Enterprise
Vendor: N/A
Versions: All versions before 6.7.100.1

Exploitation Mechanism

Local users take advantage of the repair operation's reliance on an unprivileged user's %TEMP% directory to escalate privileges.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2021-42255 vulnerability.

Immediate Steps to Take

Update AppGuard Enterprise to version 6.7.100.1 or newer.
Restrict access permissions to sensitive directories and files.

Long-Term Security Practices

Regularly monitor and audit file permissions within the system.
Implement the principle of least privilege to limit user access.

Patching and Updates

Apply security patches promptly and consistently to address known vulnerabilities in software.