Welcome to our detailed exploration of a specific cybersecurity issue that affects Apache Tomcat, one of the most popular Java application server environments used by millions around the world. Today, we’re discussing CVE-2019-0221, a vulnerability that has been classified with a medium severity level and a CVSS score of 6.1. This vulnerability pertains to the Server Side Includes (SSI) function in Apache Tomcat, specifically the printenv command.
Apache Tomcat versions affected by this issue are 9.0.0.M1 to 9.0.0.17, 8.5.0 to 8.5.39, and 7.0.0 to 7.0.93. The security flaw lies in the way the SSI printenv command can echo data provided by the user without proper escaping. This makes it susceptible to cross-site scripting (XSS) attacks. XSS occurs when attackers inject malicious scripts into web pages viewed by other users, potentially stealing credentials, taking over user sessions, or defacing web pages.
It is important to note that Server Side Includes (SSI) are disabled by default in Apache Tomcat. The printenv command, which is primarily used for debugging purposes, is not typically enabled on production sites. Despite its lesser likelihood of exposure, the potential impact on affected systems can still be serious if the vulnerable components are enabled and exploited.
Apache Tomcat serves as a crucial element in web infrastructure, managing the execution of Java servlets and rendering web pages that include JSP code. Because of its widespread use, any vulnerability in Tomcat can have significant repercussions, underscoring the need for swift action to address any issues.
In response to this vulnerability, administrators of Apache Tomcat servers must ensure that they upgrade to the latest, patched versions of the software. For Apache Tomcat 9.x, upgrading to version 9.0.0.18 or higher will resolve the issue. Similarly, users of Tomcat 8.5.x and 7.0.x should update to version 8.5.40 or 7.0.94, respectively, or later versions.
For those unsure about how to proceed with updating Tomcat or assessing the presence of the SSI printenv command in their environment, consulting the documentation provided by Apache or seeking professional advice is recommended. It is also prudent to regularly review and update your server software to protect against newly discovered vulnerabilities.
Maintaining the security of your server installations is not just about fixing current vulnerabilities; it also involves proactive measures such as configuring server settings securely, monitoring for unusual activity, and applying security best practices. Organizations can benefit from employing comprehensive patch management platforms like LinuxPatch to manage and automate the patching process efficiently and effectively. By ensuring that all components of your systems are up-to-date, you safeguard your technological assets against potential threats.
To learn more about how you can protect your Linux servers and keep them secure against vulnerabilities, visit LinuxPatch.