Microsoft Word Malformed Document Font Processing Buffer Overflow Vulnerability



Date Discovered

July 12, 2005


Microsoft Word is affected by a remote buffer overflow vulnerability. This vulnerability presents itself when a .doc file contains specific malformed input. Upon attempting to read the malformed .doc file, the affected application fails to properly validate data within the file. This may result in the attacker being able to control the flow of program execution. Attackers may exploit this vulnerability to execute arbitrary code in the context of the victim user attempting to access the malformed Word file.

Technologies Affected

  • Microsoft Office 2000
  • Microsoft Office 2000 SP1
  • Microsoft Office 2000 SP2
  • Microsoft Office 2000 SP3
  • Microsoft Office XP
  • Microsoft Office XP SP1
  • Microsoft Office XP SP2
  • Microsoft Office XP SP3
  • Microsoft Word 2000
  • Microsoft Word 2000 SP2
  • Microsoft Word 2000 SP3
  • Microsoft Word 2000 SR1
  • Microsoft Word 2000 SR1a
  • Microsoft Word 2002
  • Microsoft Word 2002 SP1
  • Microsoft Word 2002 SP2
  • Microsoft Word 2002 SP3
  • Microsoft Works 2000
  • Microsoft Works Suite 2001
  • Microsoft Works Suite 2002
  • Microsoft Works Suite 2003
  • Microsoft Works Suite 2004


Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy network intrusion detection systems to monitor all network traffic for signs of suspicious or anomalous activity. This may aid in detecting attempts to exploit latent vulnerabilities or in detecting malicious activity that occurs as a result of successful exploitation.

Do not accept or execute files from untrusted or unknown sources.
Users should not accept files from untrusted or unknown sources, as they may be malicious in nature. Avoid opening email attachments from unknown or questionable sources.

Do not follow links provided by unknown or untrusted sources.
Users should avoid Web sites of questionable integrity and not follow links supplied by unknown or untrusted sources.

Implement multiple redundant layers of security.
As it may be possible that this issue will be leveraged to execute code, memory protection schemes are recommended. Memory protection schemes such as non-executable stack/heap configurations and randomly mapped memory segments will complicate exploitation of memory corruption vulnerabilities.

Microsoft has released updates to address this vulnerability in supported versions of the affected software.



Discovery is credited to Lord Yup.

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