CVE-2021-42835: Race Condition
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 Software
Event History
Frequently Asked Questions
What is CVE-2021-42835?
CVE-2021-42835 is a vulnerability discovered in Plex Media Server through version 1.24.4.5081-e362dc1ee.
How does CVE-2021-42835 affect Plex Media Server?
CVE-2021-42835 allows an attacker with a low-privileged user account to access the exposed RPC service of the Plex Media Server update service component.
What can an attacker do with CVE-2021-42835?
With CVE-2021-42835, an attacker can interact with the RPC functionality of the Plex Media Server update service component.
What is the severity of CVE-2021-42835?
CVE-2021-42835 is classified as a high-severity vulnerability with a severity value of 7.
How do I fix CVE-2021-42835 in Plex Media Server?
To fix CVE-2021-42835, you should update Plex Media Server to version 1.25.0.5282 or newer.