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.
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