CVE-2023-28806— Signature validation error in DLL allows disabling anti-tampering protection
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公司的一个轻量级代理。 Zscaler Client Connector 4.2.0之前版本存在安全漏洞，该漏洞源于签名验证不当，允许经过身份验证的用户禁用防篡改功能。
Possible ATT&CK Techniques 1 AI
T1562
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I. Basic Information for CVE-2023-28806
Vulnerability Information
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Vulnerability Title
Signature validation error in DLL allows disabling anti-tampering protection
Source: CVE Program / CVE List V5
Vulnerability Description
An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
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公司的一个轻量级代理。 Zscaler Client Connector 4.2.0之前版本存在安全漏洞，该漏洞源于签名验证不当，允许经过身份验证的用户禁用防篡改功能。
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 ~ 4.2.0.190 | - |
|
II. Public POCs for CVE-2023-28806
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2023-28806 (1)
Same Patch Batch · Zscaler · 2024-08-06 · 6 CVEs total
| CVE-2024-23456 | 7.8 HIGH | Signature validation issue leads to Anti-Tampering bypass |
| CVE-2024-23458 | 7.3 HIGH | Local Privilege Escalation on Zscaler Client Connector on Windows |
| CVE-2024-23464 | 7.2 HIGH | Zscaler bypass with administrative privileges on Windows |
| CVE-2024-23483 | 7.0 HIGH | Local Privilege Escalation via lack of input validation |
| CVE-2024-23460 | 6.4 MEDIUM | Incorrect signature validation of package |
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Same weakness: CWE-347
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V. Comments for CVE-2023-28806
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