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Oracle Java True Type Font IDEF Opcode Parsing Remote Code Execution

Oracle Java True Type Font IDEF Opcode Parsing Remote Code Execution
Posted Feb 23, 2012
Authored by Peter Vreugdenhil | Site tippingpoint.com

A 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 True Type Font files. When reading a font file, Java will use the MaxInstructionSize from the maxp table to create a heap memory location to store all the Instruction Definition found in the Font Program 'fpgm' table. However, when Java encounters an IDEF opcode (0x89) in the opcode stream it never checks the size of the MaxInstructionSize which can result in a heap buffer overflow. This can lead to remote code execution under the context of the current process.

tags | advisory, java, remote, overflow, arbitrary, code execution
MD5 | 6dc4b5f748c872b9f9d63515be17303a

Oracle Java True Type Font IDEF Opcode Parsing Remote Code Execution

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

TPTI-12-01 : Oracle Java True Type Font IDEF Opcode Parsing Remote
Code Execution Vulnerability
http://dvlabs.tippingpoint.com/advisory/TPTI-12-01
February 22, 2012

- -- CVE ID:


- -- 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 True Type Font
files. When reading a font file, Java will use the MaxInstructionSize
from the maxp table to create a heap memory location to store all the
Instruction Definition found in the Font Program 'fpgm' table.
However, when Java encounters an IDEF opcode (0x89) in the opcode
stream it never checks the size of the MaxInstructionSize which can
result in a heap buffer overflow. This can lead to remote code
execution under the context of the current process.

- -- Vendor Response:

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

http://www.oracle.com/technetwork/topics/security/javacpufeb2012-366318.html




- -- Disclosure Timeline:
2011-10-21 - Vulnerability reported to vendor

2012-02-22 - Coordinated public release of advisory



- -- Credit:
This vulnerability was discovered by:

* Peter Vreugdenhil



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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:

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