Vulnerability identifier: #VU1221

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-2007-0671

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications
Microsoft Project
Client/Desktop applications / Office applications
Microsoft Office for Mac
Client/Desktop applications / Office applications
Microsoft Visio
Client/Desktop applications / Office applications
Word Viewer
Client/Desktop applications / Office applications
Excel Viewer
Client/Desktop applications / Office applications

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 records in Excel files. A remote attacker can create a specially crafted Excel file, 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 the following patch:

Microsoft Office 2000 Service Pack 3 — Download the update (KB 929062)

Microsoft Office XP Service Pack 3 — Download the update (KB929063)

Microsoft Office 2003 Service Pack 2 — Download the update (KB929064)

Microsoft Project 2000 Service Release 1 — Download the update (KB929062)

Microsoft Project 2002 Service Pack 1 — Download the update (KB929063)

Microsoft Visio 2002 Service Pack 2 — Download the update (KB929063)

Microsoft Office 2004 for Mac — Download the update (KB932185)

Vulnerable software versions

Microsoft Office:

Microsoft Project:

Microsoft Office for Mac: 2004

Microsoft Visio:

Word Viewer: 2003

Excel Viewer:

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External links
http://technet.microsoft.com/library/security/932553
http://technet.microsoft.com/library/security/ms07-015

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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.