CVE-2022-4149
Local privilege escalation using log file
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Local privilege escalation using log file
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.
Reserved 2022-11-28 | Published 2023-06-15 | Updated 2024-12-12 | Assigner NetskopeCWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Netskope credits Dawson Medin from Mandiant for reporting this flaw.
www.netskope.com/...tskope-security-advisory-nskpsa-2023-002
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