PT-2023-3613 · Netskope · Netskope Client Service

Dawson Medin · Published 2023-05-10 · Updated 2023-06-30 · CVE-2022-4149

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Netskope client service versions prior to R96

Description The issue is related to a synchronization error when using a shared resource, which can be exploited by a malicious local user to elevate privileges. The Netskope client service runs as NT AUTHORITYSYSTEM and writes log files to a writable directory for a standard user. A race condition is created when the service restarts, allowing a malicious user to create a file and set ACL permissions. This can make all files within the directory modifiable by an unprivileged user, and by using Windows pseudo-symlink, these files can be pointed to other places in the system, enabling malicious users to elevate privileges.

Recommendations For versions prior to R96, consider disabling the logplaceholder file until a patch is available to prevent exploitation of the race condition. Restrict access to the C:UsersPublic etSkope directory to minimize the risk of exploitation. Avoid using Windows pseudo-symlink on the affected files until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

BDU:2023-03897

CVE-2022-4149

Affected Products

Netskope Client Service

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2022-4149 · Security Note
• https://netskope.com/company/security-compliance-and-assurance/security-advisories-and-disclosures/netskope-security-advisory-nskpsa-2023-002 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2022-4149 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-03897 · Security Note
• https://t.me/cvenotify/52382 · Telegram Post
• https://t.me/cibsecurity/65256 · Telegram Post