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
02/02/2004 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.
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Copyright © 2004 Verisign, Inc.
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