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Sun JDK/JRE: Applet privilege escalation

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200602-07 / Sun JDK, applet
Release Date February 15, 2006
Latest Revision February 15, 2006: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
dev-java/sun-jdk < 1.4.2.10 >= 1.4.2.10 All supported architectures
dev-java/sun-jre-bin < 1.4.2.10 >= 1.4.2.10 All supported architectures

Related bugreports: #122156

Synopsis

Sun's Java Development Kit (JDK) and Java Runtime Environment (JRE) do not adequately constrain applets from privilege escalation and arbitrary code execution.

2.  Impact Information

Background

Sun's JDK and JRE provide interpreters for Java Applets in a sandboxed environment. These implementations provide the Java Web Start technology that can be used for easy client-side deployment of Java applications.

Description

Applets executed using JRE or JDK can use "reflection" APIs functions to elevate its privileges beyond the sandbox restrictions. Adam Gowdiak discovered five vulnerabilities that use this method for privilege escalation. Two more vulnerabilities were discovered by the vendor. Peter Csepely discovered that Web Start Java applications also can an escalate their privileges.

Impact

A malicious Java applet can bypass Java sandbox restrictions and hence access local files, connect to arbitrary network locations and execute arbitrary code on the user's machine. Java Web Start applications are affected likewise.

3.  Resolution Information

Workaround

Select another Java implementation using java-config.

Resolution

All Sun JDK users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-java/sun-jdk-1.4.2.10"

All Sun JRE users should upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-java/sun-jre-bin-1.4.2.10"

4.  References



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Page updated February 15, 2006

Summary: This is a Gentoo Linux Security Advisory

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