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Zero Day Initiative Advisory 09-050

Zero Day Initiative Advisory 09-050
Posted Aug 6, 2009
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 09-050 - This vulnerability allows remote attackers to execute arbitrary code 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 specific flaw exists within the code that handles loading a custom JPEG splash screen for a WebStart application. While handling certain parts of the splash screen, javaws.exe makes an improper calculation which is later used for an allocation. Later during decompression, Java Web Start will write data into this mis-allocated buffer resulting in a heap-based buffer overflow and eventual code execution under the context of the current user.

tags | advisory, java, remote, web, overflow, arbitrary, code execution
SHA-256 | ca7d543314563c01cb76f03850630e04c3f3bbe875fb0a9b6887812d3e2a5e75

Zero Day Initiative Advisory 09-050

Change Mirror Download
ZDI-09-050: Sun Java Web Start JPEG Header Parsing Integer Overflow
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-09-050
August 5, 2009

-- Affected Vendors:
Sun Microsystems

-- Affected Products:
Sun Microsystems Java Runtime

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code 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 specific flaw exists within the code that handles loading a custom
JPEG splash screen for a WebStart application. While handling certain
parts of the splash screen, javaws.exe makes an improper calculation
which is later used for an allocation. Later during decompression, Java
Web Start will write data into this mis-allocated buffer resulting in a
heap-based buffer overflow and eventual code execution under the context
of the current user.

-- 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=1-66-263428-1

-- Disclosure Timeline:
2009-03-26 - Vulnerability reported to vendor
2009-08-05 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
* Anonymous

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/
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