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An issue was discovered in Plex Media Server through 1.24...

High severity Unreviewed Published Dec 9, 2021 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

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Affected versions

Unknown

Patched versions

Unknown

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).

References

Published by the National Vulnerability Database Dec 8, 2021
Published to the GitHub Advisory Database Dec 9, 2021
Last updated Feb 1, 2023

Severity

High

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(95th percentile)

Weaknesses

Time-of-check Time-of-use (TOCTOU) Race Condition

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. Learn more on MITRE.

CVE ID

CVE-2021-42835

GHSA ID

GHSA-724p-rm8h-wjx7

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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