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  • US-CERT Alert TA13-010A - Oracle Java 7 Security Manager Bypass Vuln

    From Ben Ritchey@1:393/68 to All on Fri Jan 11 17:03:58 2013

    From: US-CERT Alerts <technical-alerts@us-cert.gov>
    Organization: US-CERT - +1 202-205-5266
    Subject: US-CERT Alert TA13-010A - Oracle Java 7 Security Manager Bypass Vulnerability


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    National Cyber Awareness System

    US-CERT Alert TA13-010A
    Oracle Java 7 Security Manager Bypass Vulnerability

    Original release date: January 10, 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 through update 10 are affected. Web
    browsers using the Java 7 plug-in are at high risk.


    Overview

    A vulnerability in the way Java 7 restricts the permissions of Java
    applets could allow an attacker to execute arbitrary commands on a
    vulnerable system.


    Description

    A vulnerability in the Java Security Manager allows a Java applet
    to grant itself permission to execute arbitrary code. 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).

    Any web browser using the Java 7 plug-in is affected. The Java
    Deployment Toolkit plug-in and Java Web Start can also be used as
    attack vectors.

    Reports indicate this vulnerability is being actively exploited,
    and exploit code is publicly available.

    Further technical details are available in Vulnerability Note
    VU#625617.


    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.


    Solution

    Disable Java in web browsers

    This 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,
    disable Java in web browsers.

    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 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.


    References

    * Vulnerability Note VU#625617
    <http://www.kb.cert.org/vuls/id/625617>

    * Setting the Security Level of the Java Client

    <http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/client-security.htm


    * 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

    January 10, 2013: Initial release

    ____________________________________________________________________

    Feedback can be directed to US-CERT Technical Staff. Please send
    email to <cert@cert.org> with "TA13-010A Feedback VU#625617" in
    the subject.
    ____________________________________________________________________

    Produced by US-CERT, a government organization.
    ____________________________________________________________________

    This product is provided subject to this Notification: http://www.us-cert.gov/privacy/notification.html

    Privacy & Use policy:
    http://www.us-cert.gov/privacy/

    This document can also be found at http://www.us-cert.gov/cas/techalerts/TA13-010A.html

    For instructions on subscribing to or unsubscribing from this
    mailing list, visit http://www.us-cert.gov/cas/signup.html
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    + Origin: US-CERT - +1 202-205-5266 (1:396/3)

    =-=-=-=-=-=-=-= .END of Forwarded message =-=-=-=-=-=-=-=

    --
    Be well :^)

    : Ben aka cMech Web: http://cmech.dynip.com:8080
    : Home page: http://users.lusfiber.net/~fido4cmech
    :
    + WildCat! Board 24/7 +1-337-984-4794 any BAUD 8,N,1
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    * Origin: FIDONet - The Positronium Repository (1:393/68)