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13 July 2004

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             AUSCERT External Security Bulletin Redistribution

           ESB-2004.0453 -- iDEFENSE Security Advisory 07.12.04
                         Adobe Reader 6.0 Filename
                   Handler Buffer Overflow Vulnerability
                               13 July 2004


        AusCERT Security Bulletin Summary

Product:                Adobe Reader 6.0
Publisher:              iDEFENSE
Operating System:       Windows
                        Linux variants
                        IBM AIX
                        Mac OS
                        Mac OS X
Impact:                 Execute Arbitrary Code/Commands
Access Required:        Remote
CVE Names:              CAN-2004-0632

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Adobe Reader 6.0 Filename Handler Buffer Overflow Vulnerability

iDEFENSE Security Advisory 07.12.04
July 12, 2004


Adobe Reader is a program used to display Portable Document Format (PDF)


Exploitation of a buffer overflow vulnerability in Adobe Reader 6.0
could allow remote attackers to execute arbitrary code.

The problem specifically exists within a routine that is responsible for
splitting the filename path into multiple components. Due to a parsing
error involving NULL characters, an attacker can force Adobe Reader to
open a file containing an unhandled file extension. If an overly long
extension is supplied, a stack based overflow occurs.


Successful exploitation allows an attacker to execute arbitrary code
under the privileges of the local user. Remote exploitation is possible
by sending a specially crafted e-mail and attaching the malicious PDF


iDEFENSE has confirmed that Adobe Acrobat Reader version 6.0.1 is
vulnerable. It is suspected that other versions of Adobe Acrobat Reader
are vulnerable as well. Adobe Acrobat may also be vulnerable.


Coordinated public disclosure of this vulnerability did not occur.
According to Adobe, the vulnerability was patched on June 7, 2004 when
Adobe Reader 6.0.2 was released. A vendor security advisory was not
released but the following statement was included in a changelog
(http://www.adobe.com/support/techdocs/34222.htm) detailing the changes
included in the 6.0.2 update:

"Security update to further restrict malicious code execution."

Adobe's official response is below:

"Adobe Systems Incorporated recommends that users update to the latest
release of Adobe Acrobat and the free Adobe Reader, version 6.0.2.
Instructions and further information is available at:


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2004-0632 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.


02/02/2003   Exploit discovered by iDEFENSE
03/11/2004   Initial vendor notification
03/11/2004   Initial vendor response
03/11/2004   iDEFENSE clients notified
06/07/2004   Vendor update released
07/12/2004   Public Disclosure


Greg MacManus (iDEFENSE Labs) is credited with this discovery.

Get paid for vulnerability research


Copyright (c) 2004 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
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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.

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