CVE-2021-26734— Junction Delete leading to elevation of privilege
Quick assessment
Affected
Zscaler Client Connector
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege Escalation
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
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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Other References for CVE-2021-26734 (1)
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 |
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Same vendor: Zscaler
Same weakness: CWE-269
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V. Comments for CVE-2021-26734
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