Vulnerability Alert

Oracle Java Applet Object Type Confusion Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:29067
Version:1
First Published:2013 April 23 19:37 GMT
Last Published:2013 April 23 19:37 GMT
Port: Not available
CVE:CVE-2013-2423
BugTraq ID:59162
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.7
 
Version Summary:Oracle Java Runtime Environment contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are available.
 
 
Description
Oracle Java Runtime Environment (JRE) contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to insufficient access controls implemented by the affected software when setting final fields on static classes while invoking the reflection application programming interface (API). An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a crafted website that contains a malicious Java applet. Successful exploitation could allow the attacker to bypass Java sandbox protections and execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.

Functional code that exploits this vulnerability is publicly available as part of the Metasploit framework.

Oracle has confirmed the vulnerability in a security advisory and released software updates.

 
Warning Indicators
Oracle Java Development Kit (JDK) and JRE versions 7 Update 17 and prior are vulnerable.
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link, accept the Java security warning, and run the malicious applet.

Reports indicate that this vulnerability is being actively exploited in the wild.
 
Vendor Announcements
Oracle has released a security advisory at the following link: Oracle Java SE Critical Patch Update Advisory - April 2013
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to bypass Java sandbox protections and execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
 
Technical Information
The vulnerability in the Hotspot component of the affected software is due to insufficient access controls used by the affected software when setting final fields on static classes while invoking the reflection API.

An unauthenticated, remote attacker could exploit this vulnerability by using misleading language or instructions to persuade a user to visit a website that contains a crafted Java applet and convincing the user to accept the Java security warning and run the malicious applet. When the software processes the malicious applet, a Type Confusion could occur. A successful exploit could allow the attacker to use the Type Confusion to bypass Java sandbox protections and execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.

 
Safeguards
Administrators are advised to apply the appropriate updates.

Users should verify that unsolicited links are safe to follow.

Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.

Administrators are advised to use an unprivileged account for routine activities.

Administrators are advised to monitor affected systems.
 
Patches/Software
Oracle has released updates for registered users at the following link: Oracle CPU

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
2805/0Oracle Java SE Applet Reflection Code Execution VulnerabilityS7542013 Nov 14 
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Sun Microsystems, Inc.Java Development Kit (JDK) 7.0.0 Base, Update 1, Update 2, Update 3, Update 4, Update 5, Update 6, Update 7, Update 8, Update 9, Update 10, Update 11, Update 12, Update 13, Update 14, Update 15, Update 16, Update 17
Sun Microsystems, Inc.Java Runtime Environment (JRE) 7.0 Base, Update 1, Update 2, Update 3, Update 4, Update 5, Update 6, Update 7, Update 8, Update 9, Update 10, Update 11, Update 12, Update 13, Update 14, Update 15, Update 16, Update 17

Associated Products:
N/A




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