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CVE-2022-4149— Local privilege escalation using log file

Quick assessment

Affected
Netskope Netskope Client
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.

Netskope是美国Netskope公司的一款应用于云环境的威胁防护网关。 Netskope client R96之前版本存在安全漏洞。攻击者利用该漏洞可以获得访问控制列表的权限。

CVSS 7.0 · High EPSS 0.16% · P5
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I. Basic Information for CVE-2022-4149

Vulnerability Information
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Vulnerability Title
Local privilege escalation using log file
Source: CVE Program / CVE List V5
Vulnerability Description
The Netskope client service (prior to R96) on Windows runs as NT AUTHORITY\SYSTEM which writes log files to a writable directory (C:\Users\Public\netSkope) for a standard user. The files are created and written with a SYSTEM account except one file (logplaceholder) which inherits permission giving all users full access control list. Netskope client restricts access to this file by allowing only read permissions as a standard user. Whenever the Netskope client service restarts, it deletes the logplaceholder and recreates, creating a race condition, which can be exploited by a malicious local user to create the file and set ACL permissions on the file. Once the file is created by a malicious user with proper ACL permissions, all files within C:\Users\Public\netSkope\ becomes modifiable by the unprivileged user. By using Windows pseudo-symlink, these files can be pointed to other places in the system and thus malicious users will be able to elevate privileges.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Netskope 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netskope是美国Netskope公司的一款应用于云环境的威胁防护网关。 Netskope client R96之前版本存在安全漏洞。攻击者利用该漏洞可以获得访问控制列表的权限。
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
Netskope Netskope Client 95, 0 -

II. Public POCs for CVE-2022-4149

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III. Intelligence Information for CVE-2022-4149

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Other References for CVE-2022-4149 (1)

IV. Related Vulnerabilities

Same product: Netskope Client
Same vendor: Netskope
Same weakness: CWE-367

V. Comments for CVE-2022-4149

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