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AUSCERT External Security Bulletin Redistribution
ESB-2006.0453 -- [Win]
MS06-039 Vulnerabilities in Microsoft Office Filters Could
Allow Remote Code Execution
12 July 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Office 2003, XP and 2000
Microsoft Project 2003, 2002 and 2000
OneNote 2003
Microsoft Works Suite 2006, 2005 and 2004
Publisher: Microsoft
Operating System: Windows
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2006-0007 CVE-2006-0033
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS06-039.mspx
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MS06-039 - Microsoft Office Remote Code Execution Using a Malformed PNG/GIF
CVE-2006-0033 CVE-2006-0007
Affected Software:
- Microsoft Office 2003 Service Pack 1 or Service Pack 2
- Microsoft Project 2003
- OneNote 2003
- Microsoft Office XP Service Pack 3
- Microsoft Office 2000 Service Pack 3
- Microsoft Project 2002
- Microsoft Project 2000
- Microsoft Works Suites:
- Microsoft Works Suite 2004
- Microsoft Works Suite 2005
- Microsoft Works Suite 2006
Non- Affected Software:
- Microsoft Office Viewers
- Microsoft Office 2004 for Mac
- Microsoft Office v. X for Mac
A remote code execution vulnerability exists in Office and could be
exploited when Office opened a malformed PNG or GIF file. An attacker could
exploit the vulnerability by constructing a specially crafted PNG or GIF
file that could allow remote code execution.
If a user were logged on with administrative user rights, an attacker who
successfully exploited this vulnerability could take complete control of an
affected system. An attacker could then install programs; view, change, or
delete data; or create new accounts with full user rights. Users whose
accounts are configured to have fewer user rights on the system could be
less affected than users who operate with administrative user rights.
Mitigating Factors
- ------------------
- An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. Users whose accounts are
configured to have fewer user rights on the system could be less
impacted than users who operate with administrative user rights.
- The vulnerability can not be exploited automatically through e-mail.
For an attack to be successful a user must open an attachment that is
sent in an e-mail message.
- On Office XP and Office 2003, this vulnerability could not be
exploited automatically through a Web-based attack scenario. An
attacker would have to host a Web site that contains an Office file
that is used to attempt to exploit this vulnerability. An attacker
would have no way to force users to visit a malicious Web site.
Instead, an attacker would have to persuade them to visit the Web site,
typically by getting them to click a link that takes them to the
attacker's site.
- The default PNG and GIF filters provided by the operating system
without Office installed is not affected by this vulnerability.
Note: Office 2000 does not prompt the user to Open, Save, or Cancel
before opening a document.
Workarounds
- -----------
Microsoft has tested the following workarounds. While these workarounds
will not correct the underlying vulnerability, they help block known attack
vectors. When a workaround reduces functionality, it is identified in the
following section.
Do not open or save Microsoft PNG or GIF files that you receive from
un-trusted sources or that you received unexpectedly from trusted sources.
This vulnerability could be exploited when a user opens a PNG or GIF file.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
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