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UNIRAS Brief - 104/04 - NGSSoftware Insight Security Research Advisory NISR03022004



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 104/04 dated 04.03.04  Time: 12:20  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

NGSSoftware Insight Security Research Advisory NISR03022004

Detail
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Adobe Acrobat Reader is a viewer that renders PDF documents. The Reader can be extended using the XML Forms Data Format or XFDF. XFDF is a format for representing forms data and annotations in a PDF document. XFDF files have a .xfdf extention and are rendered automatically on download when using applications such as Internet Explorer. Also note that, regardless of the file extention if the MIME type is set to "application/vnd.adobe.xfdf" the file will be treated as a XFDF. When parsing an XFDF document the Adobe Reader suffers from a classic stack based buffer overflow vulnerability.



ESB-2004.0179 -- NGSSoftware Insight Security Research Advisory NISR03022004
        Adobe Acrobat Reader XML Forms Data Format Buffer Overflow
                               04 March 2004


Product:                Adobe Acrobat Reader
Publisher:              NGSSoftware
Impact:                 Execute Arbitrary Code/Commands
Access Required:        Remote

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NGSSoftware Insight Security Research Advisory

Name: Adobe Acrobat Reader XML Forms Data Format Buffer Overflow Systems Affected: Adobe Acrobat Reader version 5.1
Severity: High Risk
Vendor URL: http://www.adobe.com/
Author: David Litchfield [ david@xxxxxxxxxxxxxxx ]
Date Vendor Notified:    7th February 2004
Date of Public Advisory: 3rd March 2004
Advisory number: #NISR03022004
Advisory URL: http://www.ngssoftware.com/advisories/adobexfdf.txt

Description
***********
Adobe Acrobat Reader is a viewer that renders PDF documents. The Reader can be extended using the XML Forms Data Format or XFDF. XFDF is a format for representing forms data and annotations in a PDF document. XFDF files have a .xfdf extention and are rendered automatically on download when using applications such as Internet Explorer. Also note that, regardless of the file extention if the MIME type is set to "application/vnd.adobe.xfdf" the file will be treated as a XFDF. When parsing an XFDF document the Adobe Reader suffers from a classic stack based buffer overflow vulnerability.


Details
*******
When the xfdf file is parsed an unsafe call to sprintf is made in preparation for outputting a debug message using OutputDebugString. Whether the process is being debugged or not the vulnerable code is still called. Rendering the file will trigger the overflow. A user would need to be enticed to a web site that hosted a malicious xfdf file or sent one via e-mail.

Fix Information
***************
On contacting Adobe, they confirmed that the current version is no longer vulnerable and NGSSoftware urgently advises users of Adobe Reader to upgrade. http://www.adobe.com/support/downloads/main.html

About NGSSoftware
*****************
NGSSoftware design, research and develop intelligent, advanced application security assessment scanners. Based in the United Kingdom, NGSSoftware have offices in the South of London and the East Coast of Scotland. NGSSoftware's sister company NGSConsulting, offers best of breed security consulting services, specialising in application, host and network security assessments.

http://www.ngssoftware.com/

Telephone +44 208 401 0070
Fax +44 208 401 0076

enquiries@xxxxxxxxxxxxxxx

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UNIRAS wishes to acknowledge the contributions of NGS Software for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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