CVE-2019-0232 Scanner

Apache Tomcat is a widely used open-source web server and servlet container that powers numerous applications and websites. It is utilized by developers and organizations worldwide to host Java applications, providing a robust infrastructure for running complex enterprise-grade services. Tomcat is often deployed in environments requiring scalability and reliability, from small startups to large corporations. It plays a crucial role in enabling dynamic web content, supporting various Java technologies such as Servlets and JSPs. Despite its extensive use, improper configuration or outdated versions of Tomcat can introduce vulnerabilities that may be exploited maliciously. As such, administrators must ensure that their Tomcat installations are up-to-date and securely configured to prevent potential threats.

The Remote Code Execution (RCE) vulnerability in Apache Tomcat allows attackers to execute arbitrary commands in the context of the web server. This vulnerability arises when the 'CGIServlet' is configured with the 'enableCmdLineArguments' option enabled, particularly on Windows platforms. Due to the way Java Runtime Environment (JRE) handles command-line arguments, an attacker can exploit this flaw to deliver and execute malicious payloads. The ability to run arbitrary code poses a significant security risk, potentially leading to full system compromise. This issue highlights the importance of configuring security settings properly to prevent unauthorized access and operation execution.

Technical details of this vulnerability involve improper handling of command-line arguments by the JRE, which can be manipulated when 'CGIServlet' is activated. On vulnerable Apache Tomcat versions, the 'enableCmdLineArguments' feature permits the passage of untrusted data to the command shell. Using crafted HTTP requests, attackers can inject and execute commands, bypassing security mechanisms. The vulnerability is particularly effective against Windows systems running specific Apache Tomcat versions and configurations. Exploitation typically involves sending crafted requests that leverage the flawed script execution capabilities, which can be validated by observing the echoed injected string in a plain-text response with a 200 status.

Exploiting this vulnerability can have dire consequences, such as unauthorized system access and control. Attacks may result in data theft, data manipulation, or denial of service to legitimate users by crashing or corrupting the system. Additionally, compromised systems could be used as a launchpad for further attacks within a network. These potential effects underline the critical necessity for regular system updates and proper configuration management to mitigate exploit risks. Organizations are urged to prioritize security patches and thoroughly audit system settings against misconfigurations that can facilitate such exploits.

REFERENCES

• http://packetstormsecurity.com/files/153506/Apache-Tomcat-CGIServlet-enableCmdLineArguments-Remote-Code-Execution.html
• http://seclists.org/fulldisclosure/2019/May/4
• https://access.redhat.com/errata/RHSA-2019:1712
• https://blog.trendmicro.com/trendlabs-security-intelligence/uncovering-cve-2019-0232-a-remote-code-execution-vulnerability-in-apache-tomcat/
• https://codewhitesec.blogspot.com/2016/02/java-and-command-line-injections-in-windows.html