VCEM-80-000151 - The vCenter ESX Agent Manager service must disable "ALLOW_BACKSLASH".

Information

When Tomcat is installed behind a proxy configured to only allow access to certain contexts (web applications), an HTTP request containing "/\../" may allow attackers to work around the proxy restrictions using directory traversal attack methods. If "allow_backslash" is "true", the "\" character will be permitted as a path delimiter. The default value for the setting is "false", but Tomcat must always be configured as if no proxy restricting context access was used, and "allow_backslash" should be set to "false" to prevent directory-traversal-style attacks. This setting can create operability issues with noncompliant clients.

Solution

Navigate to and open:

/etc/vmware-eam/catalina.properties

Update or remove the following line:

org.apache.catalina.connector.ALLOW_BACKSLASH=false

Restart the service with the following command:

# vmon-cli --restart eam

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMW_vSphere_8-0_Y25M07_STIG.zip