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Zero Day Initiative Advisory 11-306

Zero Day Initiative Advisory 11-306
Posted Oct 26, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-306 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Oracle Java. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the way Java handles IIOP deserialization. Due to insufficient type checking it is possible to trick java into allowing access to otherwise protected and private fields in built-in objects. This could be used, for example, to disable to security manager normally in place for applets. This leads to remote code execution under the context of the current user.

tags | advisory, java, remote, arbitrary, code execution
advisories | CVE-2011-3521
SHA-256 | 361a262ae72479a4afab85c66c4c74c4946348a51ecd9466a86252761ade0d32

Zero Day Initiative Advisory 11-306

Change Mirror Download
ZDI-11-306 : Oracle Java IIOP Deserialization Type Confusion Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-306
October 26, 2011

-- CVE ID:
CVE-2011-3521

-- CVSS:
9, AV:N/AC:L/Au:N/C:P/I:P/A:C

-- Affected Vendors:

Oracle



-- Affected Products:

Oracle Java Runtime



-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Oracle Java. User interaction is required to
exploit this vulnerability in that the target must visit a malicious
page or open a malicious file.

The specific flaw exists within the way Java handles IIOP
deserialization. Due to insufficient type checking it is possible to
trick java into allowing access to otherwise protected and private
fields in built-in objects. This could be used, for example, to disable
to security manager normally in place for applets. This leads to remote
code execution under the context of the current user.

-- Vendor Response:

Oracle has issued an update to correct this vulnerability. More details
can be found at:

http://www.oracle.com/technetwork/topics/security/javacpuoct2011-443431.html



-- Disclosure Timeline:
2011-05-12 - Vulnerability reported to vendor
2011-10-26 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:

* Sami Koivu



-- 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/

Follow the ZDI on Twitter:

http://twitter.com/thezdi

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