Netskope Client prior R96 on Windows toctou

Summaryinfo

A vulnerability identified as critical has been detected in Netskope Client on Windows. The affected element is an unknown function. The manipulation leads to toctou. This vulnerability is documented as CVE-2022-4149. The attack needs to be performed locally. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Netskope Client on Windows and classified as critical. This issue affects some unknown functionality. The manipulation with an unknown input leads to a toctou vulnerability. Using CWE to declare the problem leads to CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 06/15/2023 as kpsa-2023-002. It is possible to read the advisory at netskope.com. The identification of this vulnerability is CVE-2022-4149 since 11/28/2022. The technical details are unknown and an exploit is not publicly available.

Upgrading to version R96 eliminates this vulnerability.

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Vendor

• Netskope

Name

• Client

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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