CVE-2021-21324 Information

Description

GLPI is an open-source asset and IT management software package that provides ITIL Service Desk features licenses tracking and software auditing. In GLPI before version 9.5.4 there is an Insecure Direct Object Reference (IDOR) on \Solutions. This vulnerability gives an unauthorized user the ability to enumerate GLPI items names (including users logins) using the knowbase search form (requires authentication). To Reproduce: Perform a valid authentication at your GLPI instance Browse the ticket list and select any open ticket click on Solution form then Search a solution form that will redirect you to the endpoint /\glpi/front/knowbaseitem.php?item_itemtype=Ticket&item_items_id=18&forcetab=Knowbase$1\ and the item_itemtype=Ticket parameter present in the previous URL will point to the PHP alias of glpi_tickets table so just replace it with �sers\ to point to glpi_users table instead; in the same way item_items_id=18 will point to the related column id so changing it too you should be able to enumerate all the content which has an alias. Since such id(s) are obviously incremental a malicious party could exploit the vulnerability simply by guessing-based attempts.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

https://github.com/glpi-project/glpi/security/advisories/GHSA-jvwm-gq36-3v7v https://github.com/glpi-project/glpi/commit/aade65b7f67d46f23d276a8acb0df70651c3b1dc https://github.com/glpi-project/glpi/releases/tag/9.5.4

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5