US-CERT Alert TA13-032A - Oracle Java 7 Multiple Vulnerabilities

02/02/13, US-CERT Alert TA13-032A - Oracle Java 7 Multiple Vulnerabilities
From: US-CERT Alerts <technical-alerts@us-cert.gov>

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To: technical-alerts@us-cert.gov
Subject: US-CERT Alert TA13-032A - Oracle Java 7 Multiple Vulnerabilities
From: US-CERT Alerts <technical-alerts@us-cert.gov>
Date: Fri, 1 Feb 2013 18:40:10 -0500
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National Cyber Awareness System

US-CERT Alert TA13-032A
Oracle Java 7 Multiple Vulnerabilities

Original release date: February 01, 2013
Last revised: --

Systems Affected

     Any system using Oracle Java 7 (1.7, 1.7.0) including

     * Java Platform Standard Edition 7 (Java SE 7)
     * Java SE Development Kit (JDK 7)
     * Java SE Runtime Environment (JRE 7)

     All versions of Java 7 before Update 13 are affected. Web
     browsers using the Java 7 plug-in are at high risk.


Overview

   Multiple vulnerabilities in Java 7 could allow an attacker to
   execute arbitrary code on a vulnerable system.


Description

   The Oracle Java SE Critical Patch Update Advisory for February 2013
   addresses multiple vulnerabilities in the Java Runtime Environment
   (JRE). Both Java applets delivered via web browsers and stand-alone
   Java applications are affected, however web browsers using the Java
   7 plug-in are at particularly high risk. Java 7 versions below
   Update 13 are affected.

   The Java 7 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 web site 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.

   Further technical details are available in Vulnerability Note
   VU#858729.


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 for February 2013
   states that Java 7 Update 13 addresses 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

 * Vulnerability Note VU#858729
   <http://www.kb.cert.org/vuls/id/858729>

 * Oracle Java SE Critical Patch Update Advisory - February 2013
   <http://www.oracle.com/technetwork/topics/security/javacpufeb2013-1841061.html>

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

 * 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>

 * Java SE Development Kit 7, Update 13 (JDK 7u13)
   <http://www.oracle.com/technetwork/java/javase/7u13-relnotes-1902884.html>

 * Do Devs Care About Java (In)Security? (Comment about proxy
   filtering)
   <http://taosecurity.blogspot.com/2012/11/do-devs-care-about-java-insecurity.html?showComment=1353874245992#c4794680666510382012>


Revision History

  February 01, 2013: Initial release

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   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA13-032A Feedback VU#858729" in
   the subject.
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