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Checkmk Vulnerabilities Can Be Chained for Distant Code Execution

By Ionut Arghire on November 03, 2022

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Researchers at code safety agency Sonar Supply have shared particulars on a number of Checkmk vulnerabilities that could possibly be chained collectively to execute code remotely, with out authentication.

Written in Python and C++, Checkmk is an IT Infrastructure monitoring answer that permits organizations to watch servers, containers, cloud infrastructure, networks, databases, and different property utilizing a single net interface.

“Based on the seller’s web site, greater than 2,000 clients depend on Checkmk. As a result of its function, Checkmk is a central part often deployed at a privileged place in an organization’s community. This makes it a high-profile goal for menace actors,” Sonar Supply notes.

The corporate has recognized 4 vulnerabilities in Checkmk and its NagVis integration, together with two with a ‘important’ severity score (CVSS rating of 9.1).

These safety defects, Sonar Supply warns, “could be chained collectively by an unauthenticated, distant attacker to totally take over the server operating a susceptible model of Checkmk.”

The primary of the problems is described as a code injection vulnerability within the watolib part, which existed as a result of consumer information entered in Wato was improperly sanitized when writing to the PHP file.

“Previous to this Werk it was doable for authenticated customers to inject PHP code in recordsdata generated by Wato for NagVis integration. The code can be executed as soon as a request to the respective NagVis part is made,” Checkmk explains.

The second critical-severity flaw is described as an arbitrary file learn impacting NagVis, the part chargeable for creating community maps.

“An authenticated attacker can learn arbitrary recordsdata with the permissions of the online server consumer,” Checkmk notes in its advisory.

The 2 different vulnerabilities, each rated ‘medium severity’, are a line feed injection and a restricted server-side request forgery (SSRF) challenge.

“A few of the recognized vulnerabilities have restricted sensible influence on their very own. Nonetheless, a malicious attacker can chain them collectively to attain distant code execution,” Sonar Supply underlines.

The code evaluation agency explains that the exploitation chain would begin with the unauthenticated attacker exploiting the SSRF to entry an endpoint reachable from the localhost solely and which is susceptible to the road feed injection.

By forging arbitrary LQL queries – which Checkmk makes use of to fetch information from the monitoring core – the attacker can then delete arbitrary recordsdata, which might permit them to bypass current authentication mechanisms and entry NagVis.

With entry to NagVis, the attacker might exploit the arbitrary file learn to entry a particular Checkmk configuration file and achieve entry to the Checkmk GUI, after which exploit the code injection in watolib to attain distant code execution (RCE).

Sonar Supply reported the vulnerabilities to Checkmk on August 22, which patched them inside every week.

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