ZDI-08-081: Sun Java Web Start and Applet Multiple Sandbox Bypass 
Vulnerabilities
http://www.zerodayinitiative.com/advisories/ZDI-08-081
December 4, 2008

-- Affected Vendors:
Sun Microsystems

-- Affected Products:
Sun Microsystems Java Runtime

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 5527, 4714. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
These vulnerabilities allow remote attackers to bypass sandbox
restrictions on vulnerable installations of Sun Java Web Start. User
interaction is required to exploit this vulnerability in that the target
must visit a malicious page.

The first vulnerability results in a cache location and a user name
information disclosure. By accessing the SI_FILEDIR property of a
SingleInstanceImpl class, the location of the temporary single instance
files can be parsed to discover the user name and cache location.

The second vulnerability allows applets to read any file on a victim's
filesystem, outside of the restricted path of the applet. The specific
flaw exists in the handling of the file: protocol assigned to an applet
codebase. If the codebase points to the local filesystem, any file is
then readable by the malicious applet.

The third vulnerability allows JNLP files to bypass socket restrictions.
By loading a secondary JNLP with an href attribute containing a
wildcard. When this object is instantiated, all hosts are eligible for
socket connect and accept.

-- Vendor Response:
Sun Microsystems has issued an update to correct this vulnerability. More
details can be found at:

http://sunsolve.sun.com/search/document.do?assetkey=1-66-244988-1

-- Disclosure Timeline:
2008-07-14 - Vulnerability reported to vendor
2008-12-04 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Peter Csepely

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