Check Point Advisories

Microsoft Excel REPT Function Integer Overflow (MS08-057; CVE-2008-4019)

Check Point Reference: CPAI-2008-360
Date Published: 24 Oct 2010
Severity: High
Last Updated: Sunday 14 February, 2016
Source:
Industry Reference:CVE-2008-4019
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Microsoft Excel is a popular spreadsheet application that is usually released as part of the Microsoft Office suite. The application can create complex spreadsheets with multiple workbooks, formula, and various data sources. The common extension used for Microsoft Excel documents is .xls, .xlsx and .xlw. There exists a buffer overflow vulnerability in Microsoft Excel product. The vulnerability is due to an improper parsing of Excel documents containing specially crafted REPT function. Remote attackers can exploit this vulnerability by enticing target users to open a crafted Excel file, potentially causing arbitrary code to be injected and executed in the security context of the current user. In case of an attack where code injection and execution is successful, the behavior of the target machine is dependent on the intended purpose of the injected code. In case of an attack where code injection is not successful, the vulnerable application may terminate as a result of memory corruption. It may possibly lead to lose all unsaved data.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Microsoft Excel REPT Function Integer Overflow (MS08-057) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Content Protection Violation.
Attack Information:  Microsoft Excel REPT function integer overflow (MS08-057)

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