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Vulnerability Note VU#759996

Sun Java Reflection API security bypass vulnerabilities

Overview

Multiple vulnerabilities in the Sun Java Reflection API may allow an untrusted Java applet to bypass security restrictions and execute arbitrary code.

I. Description

The Sun Java Reflection API allows Java classes to determine information about other Java classes, such as public methods. There are seven vulnerabilities in the Java Reflection API that may allow a Java applet to bypass Java applet security restrictions. Once the security restrictions are bypassed, the malicious applet may be able to access and manipulate system resources.

For more information on the Java security model see Sun's Java documentation, particularly the Applet Security FAQ. For more information regarding these vulnerabilities and how to correct them, please refer to Sun Alert 102171.

Note these issues are different from the one reported in VU#974188.

II. Impact

By convincing a user to run a specially crafted Java applet, a remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the user running the applet. Web browsers with Java support may run applets from untrusted web sites.

III. Solution

Upgrade

Sun Alert 102171 suggests the following solutions:

    The first issue is addressed in the following releases:
  • JDK and JRE 5.0 Update 4 and later
  • SDK and JRE 1.4.2_09 and later
  • SDK and JRE 1.3.1_17 and later

    The second and third issues are addressed in the following releases:

  • JDK and JRE 5.0 Update 5 and later
  • SDK and JRE 1.4.2_10 and later

    The fourth issue is addressed in the following releases:

  • JDK and JRE 5.0 Update 5 and later

    The fifth, sixth, and seventh issues are addressed in the following releases:

  • JDK and JRE 5.0 Update 6 and later

    J2SE 5.0 is available for download at:

  • http://java.sun.com/j2se/1.5.0/download.jsp
  • http://java.com

    J2SE 1.4.2 is available for download at:

  • http://java.sun.com/j2se/1.4.2/download.html

Do not access Java Applets from untrusted sources

Attackers must deliver a malicious Java applet to a vulnerable system in order to take advantage of this vulnerability. By only accessing Java applets from known and trusted sources the chances of exploitation are reduced.

Disable Java in web browser

Java applets are commonly executed within a web browser. Disabling Java within the web browser may prevent an attacker from delivering a malicious applet to a vulnerable system.

Systems Affected

VendorStatusDate NotifiedDate Updated
Sun Microsystems, Inc.Vulnerable9-Feb-2006

References

http://www.kb.cert.org/vuls/id/974188
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102171-1
http://secunia.com/advisories/18760/
http://news.com.com/Sun+issues+patches+for+critical+Java+flaws/2100-7347_3-6036730.html?tag=cd.top
http://isc.sans.org/diary.php?storyid=1107&rss

Credit

These vulnerabilities were reported in Sun Alert 102171. Sun credits Adam Gowdiak with providing information about these issues.

This document was written by Jeff Gennari.

Other Information

Date Public:2006-02-07
Date First Published:2006-02-09
Date Last Updated:2006-05-03
CERT Advisory: 
CVE-ID(s):CVE-2006-0617
NVD-ID(s):CVE-2006-0617
US-CERT Technical Alerts: 
Metric:4.21
Document Revision:25

If you have feedback, comments, or additional information about this vulnerability, please send us email.
 

 
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