Vulnerability identifier: #VU1251

Vulnerability risk: Critical

CVSSv3.1: 8.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2007-0870

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications
Microsoft Word
Client/Desktop applications / Office applications
Works Suite
Client/Desktop applications / Other client software

Vendor: Microsoft

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when handling malformed stream in Word document. A remote attacker can create a specially crafted MS Word document, trick the victim into opening it and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in compromise of vulnerable system.

Note: this vulnerability is being actively exploited.

Mitigation
Install update from vendor's website:

Microsoft Office 2000 Service Pack 3:
https://www.microsoft.com/downloads/details.aspx?FamilyId=F25020F5-17C7-4A60-9088-944FFACB5F19

Microsoft Office XP Service Pack 3:
https://www.microsoft.com/downloads/details.aspx?FamilyId=0FE4F405-A568-4F15-B2C6-02D4A4B58E43

Microsoft Works Suites:

• Microsoft Works Suite 2004 - Download the update (KB934394) (same as the Microsoft Word 2002 update)
• Microsoft Works Suite 2005 - Download the update (KB934394) (same as the Microsoft Word 2002 update)
• Microsoft Works Suite 2006 - Download the update (KB934394) (same as the Microsoft Word 2002 update)

Vulnerable software versions

Microsoft Office: 2000

Works Suite: 2004 - 2006

Microsoft Word:

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External links
http://technet.microsoft.com/en-us/library/security/933052.aspx
http://technet.microsoft.com/library/security/ms07-024

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.