KM03631000 - Database and Middleware Automation. Vulnerability in Apache Tomcat - CVE-2020-1938

SUPPORT COMMUNICATION - SECURITY BULLETIN

Potential Security Impact: Remote code execution

VULNERABILITY SUMMARY

A vulnerability in Apache Tomcat was addressed by Database and Middleware Automation. The vulnerability could be exploited to remote code execution.

When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defense-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1938

CVE References:

CVE-2020-1938

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.

Micro Focus Product Name: Database and Middleware Automation

Impacted DMA versions with respective Tomcat version:

NOTE: Only versions within committed support or extended support are listed below

CVSS Version 3.0 and Version 2.0 Base Metrics

RESOLUTION

Micro Focus has made the following mitigation information available to resolve the vulnerability for the impacted versions of Database and Middleware Automation:

Step1: Login to the machine where DMA is installed as root or run below commands as “sudo” user.

Step2: Stop the DMA server with below command

            service dma stop

Step3: Open the server.xml from below location

            vi /opt/hp/dma/server/tomcat/conf/server.xml

Step4: Locate the below line (highlighted in Red) in the file and comment it out (as highlighted in Green), if not already commented out

                <!-- Define an AJP 1.3 Connector on port 8009 -->

    <Connector connectionTimeout="60000" port="8009" protocol="AJP/1.3" redirectPort="8443"/>

To Comment out

<! --  <Connector connectionTimeout="60000" port="8009" protocol="AJP/1.3" redirectPort="8443"/>  -- >

Step5: Restart the dma server with below command

       service dma start

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