CVE-2021-42835
CVSS V2 Medium 6.9
CVSS V3 High 7
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).
Overview
- CVE ID
- CVE-2021-42835
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-12-08T15:15:10
- Last Modified Date
- 2021-12-13T17:14:44
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| AND | ||||
| cpe:2.3:a:plex:media_server:*:*:*:*:*:*:*:* | 1 | OR | 1.25.0.5282 | |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | 0 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:M/Au:N/C:C/I:C/A:C
- Access Vector
- LOCAL
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- COMPLETE
- Integrity Impact
- COMPLETE
- Availability Impact
- COMPLETE
- Base Score
- 6.9
- Severity
- MEDIUM
- Exploitability Score
- 3.4
- Impact Score
- 10
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- LOCAL
- Attack Compatibility
- HIGH
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 7
- Base Severity
- HIGH
- Exploitability Score
- 1
- Impact Score
- 5.9
References
| Reference URL | Reference Tags |
|---|---|
| https://forums.plex.tv/t/security-regarding-cve-2021-42835/761510 | Vendor Advisory |
| https://bugsec.com/experts_teams/ | Third Party Advisory |
| https://ir-on.io/2021/12/02/local-privilege-plexcalation/ | Exploit Third Party Advisory |
| https://www.plex.tv/media-server-downloads/ | Product Vendor Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-42835 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42835 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:41:33 | Added to TrackCVE | |||
| 2022-12-06 03:21:58 | 2021-12-08T15:15Z | 2021-12-08T15:15:10 | CVE Published Date | updated |
| 2022-12-06 03:21:58 | 2021-12-13T17:14:44 | CVE Modified Date | updated | |
| 2022-12-06 03:21:58 | Analyzed | Vulnerability Status | updated |