Vulnerability Details

Plex Media Server < 1.21.3.4014 SSDP (PMSSDP) Reflection/Amplification DDoS Attack

Published: 2021-02-10 07:17:59

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Detection Type:
Remote Vulnerability

Solution Type:
Vendor Patch

Summary:
Plex Media Server installations in a specific (and uncommon) network position could potentially be used to reflect UDP traffic on certain device-discovery ports as part of a possible DDoS (distributed denial-of-service) attack.

Technical Details:
Plex Media Server instances which have either been deployed on a public-facing network DMZ or in an Internet Data Center (IDC), or with manually configured port-forwarding rules which forward specific UDP ports from the public Internet to devices running Plex Media Server, can potentially be abused as part of possible DDoS attacks. These actions can have the effect of exposing a Plex UPnP-enabled service registration responder to the general Internet, where it can be abused to generate reflection/amplification DDoS attacks.

Detection Method:
Sends a crafted UDP request and checks the response.

Affected Versions:
Plex Media Server prior to version 1.21.3.4014.

Recommendations:
Update to version 1.21.3.4014 or later. For mitigation steps see the referenced vendor response.

References:

https://forums.plex.tv/t/security-regarding-ssdp-reflection-amplification-ddos/687162
https://www.netscout.com/blog/asert/plex-media-ssdp-pmssdp-reflectionamplification-ddos-attack
https://mp.weixin.qq.com/s/y8IqT_mT-oC4EVC4y3bVSw

Severity
Medium
CVSS Score
5.0
Published
2021-02-10
Modified
2021-02-11
Category
Denial of Service

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