Elevated folder deletion via uninstaller junction handling
Published Oct 23, 2023 · Updated Sep 17, 2024
Improper privilege management in Zscaler Client Connector for Windows before 3.4.0.124 allows local users to delete folders with elevated rights. During uninstallation, the elevated process follows an attacker-prepared directory junction and removes the folder resolved through that junction. Exploitation requires low-privileged local access and user interaction; deletion can interrupt the host when targeted folders are operationally important.
Summary
What happened
Improper privilege management in Zscaler Client Connector for Windows before 3.4.0.124 allows local users to delete folders with elevated rights. During uninstallation, the elevated process follows an attacker-prepared directory junction and removes the folder resolved through that junction. Exploitation requires low-privileged local access and user interaction; deletion can interrupt the host when targeted folders are operationally important.
The record
- CVE
- CVE-2021-26734
- Published
- Oct 23, 2023
- Updated
- Sep 17, 2024
- Vendor
- Zscaler
- Product
- Zscaler Client Connector
- Classifications
- CWE-269, CAPEC-233, T1485
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 23, 2023CVE publishedPublication date reported by the CVE source.
- Sep 17, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.4.0.124
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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