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Adobe Reader X True Type Font MINDEX Remote Code Execution Vulnerability

TPTI-12-04: April 18th, 2012


Affected Vendors

Affected Products

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Adobe Reader. 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 Adobe Reader handles the Control Value Table 'cvt ' opcode stream in a embedded True Type Font. When processing a MINDEX opcode (0x26) the function reads an DWord from the TTF Stack, multiplies it by 4 and checks if the resulting size is small enough to fit in the remaining TTF stack space. It will then use the original value as a loop counter to copy data on the TTF stack located in the data section of Cooltype.dll. This can result in a buffer overwrite that can lead to code execution under the context of the current process.

Vendor Response

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

Disclosure Timeline

    2011-10-21 - Vulnerability reported to vendor
    2012-04-18 - Coordinated public release of advisory


This vulnerability was discovered by: