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Adobe Reader X TrueType Font 'cmap' Table Integer Overflow Vulnerability



Adobe Reader is a portable document format (PDF) reader. For more information, please visit the following page:


Remote exploitation of an integer overflow vulnerability in Adobe Systems Inc.'s Adobe Reader versions 10.1.4 and earlier could allow an attacker to execute arbitrary code with the privileges of the current user.

The vulnerability occurs during the processing of a malformed true type font 'cmap' table. When processing a specific element of the 'cmap' table data structure an integer overflow can occur resulting in a buffer, located on the heap, being improperly indexed and written to. The improper indexing of the heap buffer can result in the execution of arbitrary code.


Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing a malformed PDF document using a vulnerable version of Adobe Reader. Since PDF documents can be embedded in a Web page and parsed by default, this vulnerability can be exploited as a typical Web browser vulnerability. To exploit this vulnerability an attacker would need to craft a PDF document containing an embedded true type font file which triggers the integer overflow. Once a user has been tricked into opening the malicious PDF document in a Web browser or directly in Adobe Reader, no further user interaction is required.


The following products are vulnerable:

  • Adobe Reader XI (11.0.0) for Windows and Macintosh
  • Adobe Reader X (10.1.4) and earlier versions for Windows and Macintosh
  • Adobe Reader 9.5.2 and earlier versions for Windows and Macintosh
  • Adobe Reader 9.5.1 and earlier versions for Linux
  • Adobe Acrobat XI (11.0.0) for Windows and Macintosh
  • Adobe Acrobat X (10.1.4) and earlier versions for Windows and Macintosh
  • Adobe Acrobat 9.5.2 and earlier versions for Windows and Macintosh


iDefense is unaware of any effective workarounds for this vulnerability.


Adobe has released a fix which addresses this issue. For more information, consult their advisory at the following URL:


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2013-0623 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


10/04/2012 Initial Vendor Notification
10/04/2012 Initial Vendor Reply
01/08/2013 Coordinated Public Disclosure


This vulnerability was reported to iDefense by Alexander Gavrun.

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Copyright © 2013 Verisign, Inc.

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Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.