SB2019041101 - Remote code execution in Apache Tomcat

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) OS Command Injection (CVE-ID: CVE-2019-0232)

The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The vulnerability exists due to an input validation error within the CGI Servlet when passing arguments from JRE to the Windows environment. A remote attacker can send a specially crafted request to the CGI Servlet, inject and execute arbitrary OS commands on the system with Apache Tomcat privileges.

Successful exploitation of the vulnerability requires that Apache Tomcat is installed on Windows operating system with enabled option “enableCmdLineArguments” (CGI Servlet and “enableCmdLineArguments” option are disabled by default).

2) Cross-site scripting (CVE-ID: CVE-2019-0221)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within SSI printenv command, when parsing URI. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Example:

http://[host]/printenv.shtml?%3Cscript%3Ealert(%27xss%27)%3C/script%3E

Remediation

Install update from vendor's website.

References

• http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.19
• http://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.40
• http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.94
• http://seclists.org/fulldisclosure/2019/May/50
• https://lists.apache.org/thread.html/6e6e9eacf7b28fd63d249711e9d3ccd4e0a83f556e324aee37be5a8c@%3Cannounce.tomcat.apache.org%3E