1) Buffer overflow

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] [PCI]

CVE-ID: CVE-2007-0671

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

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: 2000 Service Pack 3, 2003, XP

Microsoft Project: 2000, 2002

Microsoft Office for Mac: 2004

Microsoft Visio: 2002

Word Viewer: 2003

Excel Viewer: 2003

CPE

• cpe:2.3:a:microsoft:microsoft_office: 2000 Service Pack 3:*:*:*:*::*:*
• cpe:2.3:a:microsoft:microsoft_office:XP:*:*:*:*::*:*
• cpe:2.3:a:microsoft:microsoft_office:2003:*:*:*:*::*:*
• cpe:2.3:a:microsoft:microsoft_project:2000:*:*:*:*::*:*
• cpe:2.3:a:microsoft:microsoft_project:2002:*:*:*:*::*:*
• cpe:2.3:a:microsoft:microsoft_office_for_mac:2004:*:*:*:*::*:*
• cpe:2.3:a:microsoft:microsoft_visio:2002:*:*:*:*::*:*
• cpe:2.3:a:microsoft:word_viewer:2003:*:*:*:*::*:*
• cpe:2.3:a:microsoft:excel_viewer:2003:*:*:*:*::*:*

External links

https://technet.microsoft.com/library/security/932553
https://technet.microsoft.com/library/security/ms07-015

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open an attachment in an e-mail message.

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.