CVE-2021-26734— Junction Delete leading to elevation of privilege
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I. Basic Information for CVE-2021-26734
Vulnerability Information
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Vulnerability Title
Junction Delete leading to elevation of privilege
Source: NVD (National Vulnerability Database)
Vulnerability Description
Zscaler Client Connector Installer on Windows before version 3.4.0.124 improperly handled directory junctions during uninstallation. A local adversary may be able to delete folders in an elevated context.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
特权管理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Zscaler Client Connector 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zscaler Client Connector是zscaler的一个应用软件。一种安装在设备上的应用程序，可确保互联网流量和对组织内部应用程序的访问是安全的并符合组织的政策，即使不在公司网络时。 Zscaler Client Connector 3.4.0.124之前版本存在安全漏洞，该漏洞源于在卸载过程中未正确处理目录连接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Zscaler | Client Connector | 0 ~ 3.4.0.124 | - |
II. Public POCs for CVE-2021-26734
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Zscaler · 2023-10-23 · 12 CVEs total
| CVE-2023-28804 | 8.2 HIGH | Linux ZCC allows unsigned updates, allowing elevated Code Execution |
| CVE-2021-26738 | 7.8 HIGH | Privilege Escalation for ZCC macOS via PATH Variable |
| CVE-2023-28793 | 7.8 HIGH | Heap Based Buffer Overflow in Library |
| CVE-2023-28795 | 7.8 HIGH | Client IPC validation bypass |
| CVE-2023-28796 | 7.1 HIGH | IPC Bypass Through PLT Section in ELF |
| CVE-2021-26735 | 6.7 MEDIUM | Untrusted Search Path While Executing REG DELETE by Uninstaller |
| CVE-2021-26736 | 6.7 MEDIUM | ZApp Installer Privilege Escalation Vulnerabilities |
| CVE-2023-28805 | 6.7 MEDIUM | ZCC on Linux privilege escalation |
| CVE-2023-28797 | 6.3 MEDIUM | LPE using arbitrary file delete with Symlinks |
| CVE-2023-28803 | 5.9 MEDIUM | Traffic being bypassed by ZCC by configuring synthetic IP range as local network |
| CVE-2021-26737 | 5.5 MEDIUM | Privilege Escalation Using PID Reuse in ZCC macOS |
IV. Related Vulnerabilities
Same product: Client Connector
- CVE-2024-31127
MacOS Zscaler Client Connector Local Privilege Escalation - CVE-2023-28806
Signature validation error in DLL allows disabling anti-tamp - CVE-2024-23483
Local Privilege Escalation via lack of input validation - CVE-2024-23460
Incorrect signature validation of package - CVE-2024-23464
Zscaler bypass with administrative privileges on Windows
Same weakness: CWE-269
- CVE-2026-42562
Plainpad: Privilege Escalation via Writable Admin Field in P - CVE-2026-41163
bubblewrap vulnerable to privilege escalation in setuid mode - CVE-2026-44987
SysReptor: Privilege Escalation from User Admin to Superuser - CVE-2026-42185
People: Privilege Escalation via Missing Role Ceiling in Mai - CVE-2026-40001
Local privilege escalation vulnerability in ZTE PROCESS Guar
V. Comments for CVE-2021-26734
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