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CVE-2021-42835 Detail

Description

An issue was discovered in Plex Media Server through 1.24.4.5081-e362dc1ee. An attacker (with a foothold in a endpoint via a low-privileged user account) can access the exposed RPC service of the update service component. This RPC functionality allows the attacker to interact with the RPC functionality and execute code from a path of his choice (local, or remote via SMB) because of a TOCTOU race condition. This code execution is in the context of the Plex update service (which runs as SYSTEM).


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://bugsec.com/experts_teams/ Third Party Advisory 
https://bugsec.com/experts_teams/ Third Party Advisory 
https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510 Vendor Advisory 
https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510 Vendor Advisory 
https://ir-on.io/2021/12/02/local-privilege-plexcalation/ Exploit  Third Party Advisory 
https://ir-on.io/2021/12/02/local-privilege-plexcalation/ Exploit  Third Party Advisory 
https://www.plex.tv/media-server-downloads/ Product  Vendor Advisory 
https://www.plex.tv/media-server-downloads/ Product  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-42835
NVD Published Date:
12/08/2021
NVD Last Modified:
11/21/2024
Source:
MITRE