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Microsoft Visual Basic for Applications Buffer Overflow
Secunia Advisory: SA21408
Release Date: 2006-08-08
Last Update: 2006-08-22
Popularity: 12,821 views

Critical:
Extremely critical
Impact: System access
Where: From remote
Solution Status: Vendor Patch

Software:Microsoft Access 2000
Microsoft Office 2000
Microsoft Office Project 2002
Microsoft Office XP
Microsoft Project 2000
Microsoft Visio 2002
Microsoft Visual Basic for Applications SDK 6.x
Microsoft Works Suite 2004
Microsoft Works Suite 2005
Microsoft Works Suite 2006

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CVE reference:CVE-2006-3649


Description:
A vulnerability has been reported in Microsoft Visual Basic for Applications, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error in the Visual Basic Design Time Environment (VBE6.DLL) when document properties are passed from a host application when opening a document. This can be exploited to cause a stack-based buffer overflow via an overly long string.

Successful exploitation allows execution of arbitrary code when a user e.g. opens a specially crafted Office document or visits a malicious website.

NOTE: According to the vendor, the vulnerability is being actively exploited in the wild.

Solution:
Apply patches.

Microsoft Office 2000 SP3:
http://www.microsoft.com/downloads/de...=837A4FA9-FABC-4119-9AAF-2C8663029D2B

Microsoft Project 2000 SR1:
http://www.microsoft.com/downloads/de...=744DD25D-B9A7-4E30-B64E-1C9BB0F87D90

Microsoft Access 2000 Runtime SP3:
http://www.microsoft.com/downloads/de...=ED5A8C40-C592-4299-AFB2-5F0F6E2B1DCD

Microsoft Office XP SP3:
http://www.microsoft.com/downloads/de...=B26ADC3C-1DB8-46FD-8381-B199EE351E7C

Microsoft Project 2002 SP1:
http://www.microsoft.com/downloads/de...=62EF50AA-6061-4185-9713-F8C31B195103

Microsoft Visio 2002 SP2:
http://www.microsoft.com/downloads/de...=43525B6A-58B7-49C7-88D8-4983D1614A96

Microsoft Works Suite 2004:
http://www.microsoft.com/downloads/de...=B26ADC3C-1DB8-46FD-8381-B199EE351E7C

Microsoft Works Suite 2005:
http://www.microsoft.com/downloads/de...=B26ADC3C-1DB8-46FD-8381-B199EE351E7C

Microsoft Works Suite 2006:
http://www.microsoft.com/downloads/de...=B26ADC3C-1DB8-46FD-8381-B199EE351E7C

Microsoft Visual Basic for Applications SDK 6.0:
http://www.microsoft.com/downloads/de...=424DF92A-3CC4-4B72-B2F8-D45ED2A8F4B3

Microsoft Visual Basic for Applications SDK 6.2:
http://www.microsoft.com/downloads/de...=424DF92A-3CC4-4B72-B2F8-D45ED2A8F4B3

Microsoft Visual Basic for Applications SDK 6.3:
http://www.microsoft.com/downloads/de...=424DF92A-3CC4-4B72-B2F8-D45ED2A8F4B3

Microsoft Visual Basic for Applications SDK 6.4:
http://www.microsoft.com/downloads/de...=424DF92A-3CC4-4B72-B2F8-D45ED2A8F4B3

Provided and/or discovered by:
Discovered in the wild as a 0-day.

The vendor also credits Ka Chun Leung, Symantec.

Changelog:
2006-08-09: Added link to US-CERT.
2006-08-22: Added additional information.

Original Advisory:
MS06-047 (KB921645):
http://www.microsoft.com/technet/security/Bulletin/MS06-047.mspx

Other References:
US-CERT VU#159484:
http://www.kb.cert.org/vuls/id/159484


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