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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== 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 Solaris IBM AIX HP-UX Mac OS Mac OS X Impact: Execute Arbitrary Code/Commands Access Required: Remote CVE Names: CAN-2004-0632 - --------------------------BEGIN INCLUDED TEXT-------------------- Adobe Reader 6.0 Filename Handler Buffer Overflow Vulnerability iDEFENSE Security Advisory 07.12.04 www.idefense.com/application/poi/display?id=116&type=vulnerabilities July 12, 2004 I. BACKGROUND Adobe Reader is a program used to display Portable Document Format (PDF) documents. II. DESCRIPTION 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. III. ANALYSIS 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 document. IV. DETECTION 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. V. VENDOR RESPONSE 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: http://www.adobe.com/support/techdocs/34222.htm." VI. CVE INFORMATION 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. VII. DISCLOSURE TIMELINE 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 VIII. CREDIT Greg MacManus (iDEFENSE Labs) is credited with this discovery. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp VI. LEGAL NOTICES 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 written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@idefense.com for permission. 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On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQPM0qCh9+71yA2DNAQL+3AQAgReE7tO0XFDy1FBmZ5kMv3Nfsyk9fInF rlA6+Q3AEbtjUavkSokR8hrkVs5/FtYs5/9q9+7hpw07olGNw5wBCa3+Yy2YP/Ga O522WEWaHtO3OPlNB9CiZ33vDoWsbNnnvnlcLmRHMi3sWMx+3Sltk+P3hSbQxaBH PLGDtDRYVA4= =g62L -----END PGP SIGNATURE-----