Vulnerability 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).
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Plex | Media Server | < 1.25.0.5282 |
| Microsoft | Windows | - |
Related Weaknesses (CWE)
References
- https://bugsec.com/experts_teams/Third Party Advisory
- https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510Vendor Advisory
- https://ir-on.io/2021/12/02/local-privilege-plexcalation/ExploitThird Party Advisory
- https://www.plex.tv/media-server-downloads/ProductVendor Advisory
- https://bugsec.com/experts_teams/Third Party Advisory
- https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510Vendor Advisory
- https://ir-on.io/2021/12/02/local-privilege-plexcalation/ExploitThird Party Advisory
- https://www.plex.tv/media-server-downloads/ProductVendor Advisory
FAQ
What is CVE-2021-42835?
CVE-2021-42835 is a vulnerability with a CVSS score of 7.0 (HIGH). 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 upda...
How severe is CVE-2021-42835?
CVE-2021-42835 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-42835?
Check the references section above for vendor advisories and patch information. Affected products include: Plex Media Server, Microsoft Windows.