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CVE-2021-26738— Privilege Escalation for ZCC macOS via PATH Variable

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 3.7之前版本存在安全漏洞，该漏洞源于允许攻击者修改path变量来加载其他文件并以root权限执行代码。

CVSS 7.8 · High EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-26738

Vulnerability Information
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Vulnerability Title
Privilege Escalation for ZCC macOS via PATH Variable
Source: CVE Program / CVE List V5
Vulnerability Description
Zscaler Client Connector for macOS prior to 3.7 had an unquoted search path vulnerability via the PATH variable. A local adversary may be able to execute code with root privileges.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可信的搜索路径
Source: CVE Program / CVE List V5
Vulnerability Title
Zscaler Client Connector 代码问题漏洞
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 3.7之前版本存在安全漏洞，该漏洞源于允许攻击者修改path变量来加载其他文件并以root权限执行代码。
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 ~ 3.7 -

II. Public POCs for CVE-2021-26738

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III. Intelligence Information for CVE-2021-26738

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Other References for CVE-2021-26738 (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-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
CVE-2021-26734 4.4 MEDIUM Junction Delete leading to elevation of privilege

IV. Related Vulnerabilities

Same product: Client Connector
Same vendor: Zscaler
Same weakness: CWE-426

V. Comments for CVE-2021-26738

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