[NT] Microsoft Word Font Parsing Buffer Overflow Vulnerability (Technical Details, MS-05-035)

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  Microsoft Word Font Parsing Buffer Overflow Vulnerability (Technical 
Details, MS-05-035)
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SUMMARY

Microsoft Word is the word processing component of the  
<http://office.microsoft.com/en-us/default.aspx> Microsoft Office package.

Remote exploitation of a buffer overflow vulnerability in Microsoft Word's 
font handling could allow execution of arbitrary code.

DETAILS

Vulnerable Systems:
 * Microsoft Word 2002
 * Microsoft Word 2000

Immune Systems:
 * Microsoft Word 2003

A specially crafted .doc file, containing long font information, can cause 
Word to overwrite stack space. No checks are made on the length of data 
being copied, allowing the return address on the stack to be overwritten.

Successful exploitation allows remote attackers to execute arbitrary code 
in the context of the target user that opened the malicious document. The 
data that is written onto the stack is in the form "00xx00yy", where "xx" 
and "yy" are controlled by the input. While this tends to make 
exploitation more difficult, it does not prevent it, as it may be possible 
for an attacker to cause controlled data to be put into a memory location 
matching the required format.

Workaround:
User awareness is the best method of defense against this class of attack. 
Users must be wary when opening files from untrusted sources. When 
possible, run client software, as regular user accounts with limited 
access to system resources. This may limit the immediate consequences of 
client-side vulnerabilities.

Vendor response:
The vendor security advisory and appropriate patches are available at:  
<http://www.microsoft.com/technet/security/Bulletin/MS05-035.mspx> 
http://www.microsoft.com/technet/security/Bulletin/MS05-035.mspx

CVE Information:
 <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0564> 
CAN-2005-0564

Disclosure Timeline:
 * 24.03.05 - Initial vendor notification
 * 24.03.05 - Initial vendor response
 * 12.07.05 - Coordinated public disclosure


ADDITIONAL INFORMATION

The original article can be found at:  
<http://www.idefense.com/application/poi/display?id=281&type=vulnerabilities> 
http://www.idefense.com/application/poi/display?id=281&type=vulnerabilities



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