Code Execution flaw patched in Apache Tomcat

Several security vulnerabilities have been patched in recent weeks in Apache Tomcat, including the CVE-2017-12617 Code Execution vulnerability.

Several security vulnerabilities have been patched in recent weeks in Apache Tomcat. The list of fixed flaws recently addressed also included code execution vulnerabilities.

Apache Tomcat is the most widely used web application server, with over one million downloads per month and over 70% penetration in the enterprise datacenter.

On Tuesday, the Apache Tomcat development team publicly disclosed the presence of a remote code execution vulnerability, tracked as CVE-2017-12617, affecting the popular web application server. The Tomcat versions 9.x, 8.5.x, 8.0.x and 7.0.x are affected by the flaw.

The vulnerability classified as “important” severity, has been fixed in the versions 9.0.1, 8.5.23, 8.0.47 and 7.0.82.

The vulnerability only affected systems that have the HTTP PUT method enabled, it could be exploited by attackers to upload a malicious JSP file to a targeted server using a specially crafted request. Once the file has been uploaded, the code it contains could be executed by requesting the file.

Fortunately, the extent of the flaw is limited by the fact that it could be triggered only on the default servlet configured with the readonly parameter set to false or the WebDAV servlet enabled with the readonly  parameter set to false.

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