Plex Media Server < 1.18.2 Privilege Escalation

high Nessus Plugin ID 137327
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Synopsis

A client-server media player running on the remote host is affected by a privilege escalation vulnerability.

Description

According to its self-reported version number, the version of Plex Media Server installed on the remote Windows host is prior to 1.18.2. It is, therefore, affected by a local privilege escalation vulnerability. The vulnerability exists in the Plex Update Service due to exposed functionality over an ALPC port. An unauthenticated, local attacker can exploit this, via the ALPC port, to execute arbitrary commands with SYSTEM privileges.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Plex Media Server version 1.18.2 or later. Versions 1.19.1.2701, 1.19.2.2702, or later, are recommended by Plex, as those versions include additional hardening to protect against future vulnerabilities.

See Also

https://www.tenable.com/security/research/tra-2020-25

https://forums.plex.tv/t/security-regarding-cve-2020-5740/579634

Plugin Details

Severity: High

ID: 137327

File Name: plex_1_18_2.nasl

Version: 1.3

Type: combined

Agent: windows

Family: Windows

Published: 6/11/2020

Updated: 7/2/2020

Dependencies: plex_detect.nbin, os_fingerprint.nasl, plex_win_installed.nbin

Risk Information

CVSS Score Source: CVE-2020-5740

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:plex:plex_media_server

Required KB Items: installed_sw/Plex Media Server, Host/OS

Exploit Ease: No known exploits are available

Patch Publication Date: 4/21/2020

Vulnerability Publication Date: 4/21/2020

Reference Information

CVE: CVE-2020-5740