Bypass Record
Tamper-Protection Bypass × Zscaler Client Connector for Windows
A publicly-reported instance of Tamper-Protection Bypass bypassing Zscaler Client Connector for Windows, recorded with its original source. Factual record; no assessment of any specific deployment.
Mechanism
A Time-of-Check Time-of-Use (TOCTOU) race condition in the Repair App functionality: a timing gap between the anti-tampering security check and the actual use of the protected resource allows an attacker to manipulate system state and bypass protections, potentially disabling or reconfiguring the Zscaler Client Connector agent.
Detection & mitigation
Monitor for unexpected termination or reconfiguration of Zscaler Client Connector processes, especially during repair operations. Use endpoint detection and response (EDR) telemetry to alert on suspicious process interactions or file modifications targeting Zscaler binaries and configuration files, and ensure the agent is updated to version 4.2.1 or later to remediate the vulnerability.
This is a record of a publicly-reported event, not an assessment of any specific organization's deployment. Detection and mitigation notes are drawn from the cited source. Where the source is silent, fields are omitted.