Vulnerability · Published Dec 8, 2021 · Assigned by mitre

CVE-2021-42835

High 7.0

In plain English

A high-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 68% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS NVD)7.0High

Exploit odds (30 days)1.2%top 32.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack tooling1Public PoC

Official 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).

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://www.plex.tv/media-server-downloads/ x_refsource_MISC
https://bugsec.com/experts_teams/ x_refsource_MISC
https://ir-on.io/2021/12/02/local-privilege-plexcalation/ x_refsource_MISC
https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510 x_refsource_MISC