[原文]Format string vulnerability in Adobe Acrobat Reader 6.0.0 through 6.0.2 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via an .ETD document containing format string specifiers in (1) title or (2) baseurl fields.
iDEFENSE Security Advisory 12.13.2004-2 - Remote exploitation of a format string vulnerability in version 6.0.2 of Adobe's Reader could allow attackers to execute arbitrary code.
Adobe Reader 6.0 .ETD File Format String Vulnerability
iDEFENSE Security Advisory 12.13.04
December 14, 2004
Adobe Acrobat Reader is a program for viewing Portable Document Format
(PDF) documents. More information is available at the following site:
Remote exploitation of a format string vulnerability in version 6.0.2
of Adobe's Reader could allow attackers to execute arbitrary code.
The problem specifically exists in the parsing of .etd files used in
eBook transactions. A .etd file containing a format string in the
'title' or 'baseurl' fields can cause an invalid memory access:
This may allow for the execution of arbitrary code.
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 either the
maliciously crafted PDF document or a link to it.
iDEFENSE has confirmed that Adobe Reader version 6.0.2 is vulnerable.
It is suspected that earlier versions of Adobe Reader 6 are also
vulnerable. Adobe Acrobat may also be vulnerable.
Deleting the following file will prevent exploitation of this
"C:\Program Files\Adobe\Acrobat 6.0\Reader\plug_ins\eBook.api"
This will not impact reading .PDF files.
Removing this file prevents Adobe Reader from handling eBooks. When a
file handled by this plugin is detected, an error dialog box will
appear, offering to take the user to Adobe's website for information.
VI. VENDOR RESPONSE
This vulnerability is addressed in Adobe Acrobat Reader 6.0.3. Downloads
for platform specific versions are available at the links shown below:
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-1153 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
VIII. DISCLOSURE TIMELINE
10/13/2004 Initial vendor notification
10/14/2004 Initial vendor response
12/14/2004 Coordinated public disclosure
This vulnerability was discovered by Greg MacManus, iDEFENSE Labs.
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X. 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 email@example.com for permission.
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,
Adobe Reader .etd File Multiple Field Format String
Remote / Network Access,
Local / Remote,
Loss of Confidentiality,
Loss of Integrity
Adobe Reader contains a flaw that may allow a malicious user to dislose sensitive information or compromise a system. The issue is triggered when a format string error occurs when parsing a .etd file of a specialy crafted ebook. It is possible that the flaw may allow arbritary code to be executed resulting in a loss of confidentiality and/or integrity.
Upgrade to version 6.0.3 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.