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US-CERT Technical Cyber Security Alert - Oracle Java Multiple Vulnerabilities (US-CERT Alert TA13-051A)
National Cyber Awareness System

US-CERT Alert TA13-051A
Oracle Java Multiple Vulnerabilities

Original release date: February 20, 2013
Last revised: --

Systems Affected

     Any system using Oracle Java including

     * JDK and JRE 7 Update 13 and earlier
     * JDK and JRE 6 Update 39 and earlier
     * JDK and JRE 5.0 Update 39 and earlier
     * SDK and JRE 1.4.2_41 and earlier

     Web browsers using the Java plug-in are at high risk.


Overview

   Multiple vulnerabilities in Java could allow an attacker to execute
   arbitrary code on a vulnerable system.


Description

   The Oracle Java SE Critical Patch Update Advisory Update for
   February 2013 addresses multiple vulnerabilities in the Java
   Runtime Environment (JRE). An additional five fixes that had been
   previously planned for delivery are in this update. This
   distribution therefore completes the content for all originally
   planned fixes to be included in the Java SE Critical Patch Update
   for February 2013.

   Both Java applets delivered via web browsers and stand-alone Java
   applications are affected, however web browsers using the Java
   plug-in are at particularly high risk.

   The Java plug-in, the Java Deployment Toolkit plug-in, and Java Web
   Start can be used as attack vectors. An attacker could use social
   engineering techniques to entice a user to visit a link to a
   website hosting a malicious Java applet. An attacker could also
   compromise a legitimate website and upload a malicious Java applet
   (a "drive-by download" attack).

   Some vulnerabilities affect stand-alone Java applications,
   depending on how the Java application functions and how it
   processes untrusted data.

   Reports indicate that at least one of these vulnerabilities is
   being actively exploited.


Impact

   By convincing a user to load a malicious Java applet or Java
   Network Launching Protocol (JNLP) file, an attacker could execute
   arbitrary code on a vulnerable system with the privileges of the
   Java plug-in process.

   Stand-alone java applications may also be affected.


Solution

   Update Java

   The Oracle Java SE Critical Patch Update Advisory Update for
   February 2013 states that Java 7 Update 15 and Java 6 Update 41
   address these vulnerabilities.

   Disable Java in web browsers

   These and previous Java vulnerabilities have been widely targeted
   by attackers, and new Java vulnerabilities are likely to be
   discovered. To defend against this and future Java vulnerabilities,
   consider disabling Java in web browsers until adequate updates have
   been installed. As with any software, unnecessary features should
   be disabled or removed as appropriate for your environment.

   Starting with Java 7 Update 10, it is possible to disable Java
   content in web browsers through the Java control panel applet. From
   Setting the Security Level of the Java Client:

   For installations where the highest level of security is required,
   it is possible to entirely prevent any Java apps (signed or
   unsigned) from running in a browser by de-selecting Enable Java
   content in the browser in the Java Control Panel under the Security
   tab.

   If you are unable to update to at least Java 7 Update 10, please
   see the solution section of Vulnerability Note VU#636312 for
   instructions on how to disable Java on a per-browser basis.

   Restrict access to Java applets

   Network administrators unable to disable Java in web browsers may
   be able to help mitigate these and other Java vulnerabilities by
   restricting access to Java applets using a web proxy. Most web
   proxies have features that can be used to block or whitelist
   requests for .jar and .class files based on network location.
   Filtering requests that contain a Java User-Agent header may also
   be effective. For environments where Java is required on the local
   intranet, the proxy can be configured to allow access to Java
   applets hosted locally, but block access to Java applets on the
   internet.


References

 * Oracle Java SE Critical Patch Update Advisory Update - February
   2013
  
<http://www.oracle.com/technetwork/topics/security/javacpufeb2013update-1905892.ht
ml>

 * Setting the Security Level of the Java Client
  
<http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/client-security.html&g
t;

 * The Security Manager
  
<http://docs.oracle.com/javase/tutorial/essential/environment/security.html>

 * How to disable the Java web plug-in in Safari
   <https://support.apple.com/kb/HT5241>

 * How to turn off Java applets
  
<https://support.mozilla.org/en-US/kb/How%20to%20turn%20off%20Java%20applets>

 * NoScript
   <http://noscript.net/>

 * Securing Your Web Browser
   <https://www.us-cert.gov/reading_room/securing_browser/#Safari>

 * Vulnerability Note VU#636312
   <http://www.kb.cert.org/vuls/id/636312#solution>


Revision History

  February 20, 2013: Initial release

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   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA13-051A Feedback " in
   the subject.
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