Zabbix versions 2.0.8 and below suffer from a remote SQL injection vulnerability.
======================================================================= title: SQL injection vulnerability product: Zabbix vulnerable version: <=2.0.8 fixed version: 2.0.9rc1 CVE number: CVE-2013-5743 impact: critical homepage: http://www.zabbix.com/ found: 2013-09-03 by: Bernhard Schildendorfer SEC Consult Vulnerability Lab https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Zabbix is the ultimate open source availability and performance monitoring solution. Zabbix offers advanced monitoring, alerting, and visualization features today which are missing in other monitoring systems, even some of the best commercial ones." Source: http://www.zabbix.com/product.php Business recommendation: ------------------------ By exploiting this SQL injection vulnerability, an authenticated attacker (or guest user) is able to gain full access to the database. This causes a privilege escalation to power users as well as a possible compromise of the database and operating system the database is running on. Because of the functionalities Zabbix offers, an attacker with admin privileges could be able (depending on the actual configuration) to execute arbitrary OS commands on the configured Zabbix hosts. This results in a severe impact to the monitored infrastructure. Although the attacker needs to be authenticated in general, the system could also be at risk if the adversary has no user account. Zabbix offers a guest mode which provides a low privileged default account for users without password. If this guest mode is enabled, the SQL injection vulnerability can be exploited unauthenticated. Vulnerability overview/description: ----------------------------------- The PHP JSON API provides access to different classes which lack input validation of some of their parameters. This can be exploited to inject into SQL query statements. By exploiting this vulnerability, an attacker gains access to all records stored in the database with the privileges of the Zabbix database user. Proof of concept: ----------------- The affected PHP file api_jsonrpc.php handles JSON requests to the Zabbix API which get, after passing to class.cjsonrpc.php, dispatched by class.czbxrpc.php to the actual (vulnerable) API classes located in /frontends/php/api/classes/*. The example proof of concept exploit has been removed from this advisory. A quick search in the source code revealed, that at least the following methods are also vulnerable with the given parameters. Not all of them were tested: - alert.get // parameter: time_from, time_till - event.get // parameter: object, source, eventid_from, eventid_till - graphitem.get // parameter: type - graph.get // parameter: type - graphprototype.get // parameter: type - history.get // parameter: time_from, time_till - trigger.get // parameter: lastChangeSince, lastChangeTill, min_severity - triggerprototype.get // parameter: min_severity - usergroup.get // parameter: status Because no prepared statements are used to query the database, further injection points may be in place where prior validation fails. Vulnerable / tested versions: ----------------------------- Zabbix 2.0.8 Vendor contact timeline: ------------------------ 2013-09-10: Contacting vendor through [email protected] 2013-09-10: Initial vendor response 2013-09-10: Forwarding security advisory to vendor 2013-09-10: Vendor acknowledges that the advisory was received 2013-09-11: Vendor confirmed the issue 2013-10-02: Patch released by vendor 2013-10-04: SEC Consult releases coordinated security advisory. Solution: --------- According to the vendor, patches for the following Zabbix versions are available for download. They were not tested by SEC Consult. 1.8.18rc1: https://support.zabbix.com/secure/attachment/24448/ZBX-7091-1.8.18rc1.patch 1.8.2: https://support.zabbix.com/secure/attachment/24447/ZBX-7091-1.8.2.patch 2.0.8: https://support.zabbix.com/secure/attachment/24449/ZBX-7091-2.0.8.patch 2.0.9rc1: https://support.zabbix.com/secure/attachment/24450/ZBX-7091-2.0.9rc1.patch 2.1.7: https://support.zabbix.com/secure/attachment/24451/ZBX-7091-2.1.7.patch Additional information is available on the vendor's bug tracking page: https://support.zabbix.com/browse/ZBX-7091 Workaround: ----------- No workaround available. # 0day.today [2018-01-02] #