[NEWS] Sun Microsystems Java GIF File Parsing Memory Corruption (ZDI-07-005)

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Sun Microsystems Java GIF File Parsing Memory Corruption (ZDI-07-005)
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SUMMARY

A security vulnerability in processing GIF images in the Java Runtime
Environment may allow an untrusted applet to elevate it's privileges.

DETAILS

Vulnerable Systems:
* JDK and JRE 5.0 Update 9 and earlier (all platforms)
* SDK and JRE 1.4.2_12 and earlier (all platforms)
* SDK and JRE 1.3.1_18 and earlier (all platforms)

This vulnerability allows attackers to execute arbitrary code on
vulnerable installations of Sun Microsystems Java Virtual Machine (JVM).
User interaction is required to exploit this vulnerability in that the
target must visit a malicious website.

The specific flaw exists during the parsing of GIF image components. When
the image width in an image block of a valid GIF file is set to 0, the
Java runtime will allocate the specified size but subsequently copy all
data to the under allocated memory chunk. The overflow results in the
corruption of multiple pointers, at least one of which is later
dereferenced and can therefore result in execution of arbitrary code.

Vendor Response:
Sun has issued an update to correct this vulnerability. More details can
be found at:
<http://www.sunsolve.sun.com/search/document.do?assetkey=1-26-102760-1>
http://www.sunsolve.sun.com/search/document.do?assetkey=1-26-102760-1

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0243>
CVE-2007-0243

Disclosure Timeline:
* 2006.06.16 - Vulnerability reported to vendor
* 2006.12.18 - Digital Vaccine released to TippingPoint customers
* 2007.01.16 - Coordinated public release of advisory


ADDITIONAL INFORMATION

The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-07-005.html>
http://www.zerodayinitiative.com/advisories/ZDI-07-005.html



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