Description

Versa SASE Client for Windows versions released between 7.8.7 and 7.9.4 contain a local privilege escalation vulnerability in the audit log export functionality. The client communicates user-controlled file paths to a privileged service, which performs file system operations without impersonating the requesting user. Due to improper privilege handling and a time-of-check time-of-use race condition combined with symbolic link and mount point manipulation, a local authenticated attacker can coerce the service into deleting arbitrary directories with SYSTEM privileges. This can be exploited to delete protected system folders such as C:\\Config.msi and subsequently achieve execution as NT AUTHORITY\\SYSTEM via MSI rollback techniques.

Weaknesses 2

References 2

• security-portal.versa-networks.com https://security-portal.versa-networks.com/emailbulletins/69421e33d03aafc8e5bdaf21
• vulncheck.com https://www.vulncheck.com/advisories/versa-sase-client-for-windows-arbitrary-file-deletion-leading-to-lpe

Remediation