CIS CYBER SECURITY ADVISORIES

MS-ISAC CYBER SECURITY ADVISORY NUMBER:
2010-106

DATE(S) ISSUED:
12/14/2010

SUBJECT:
Vulnerabilities in Microsoft Office Graphics Filters Could Allow for Remote Code Execution (MS10-105)

OVERVIEW: Seven vulnerabilities have been discovered in Microsoft Office, which is Microsoft's business application suite. These vulnerabilities can be exploited by opening a specially crafted Microsoft Office document received as an email attachment, or by visiting a website that is hosting a malicious Microsoft Office document. Successful exploitation could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Failed exploitation could result in denial-of-service conditions.

SYSTEMS AFFECTED:
  • Microsoft Office XP
  • Microsoft Office 2003
  • Microsoft Office 2007
  • Microsoft Office 2010
  • Microsoft Office Converter Pack
  • Microsoft Works 9

RISK:
Government:

  • Large and medium government entities:High
  • Small government entities:High

Businesses:

  • Large and medium business entities:High
  • Small business entities:High

Home users: High

 

DESCRIPTION:

Seven remote code execution vulnerabilities have been discovered in Microsoft Office. Specifically, the vulnerabilities are caused by Microsoft Office improperly parsing certain image file formats and performing insufficient data validation when rendering images. Details of these vulnerabilities are as follows:

CGM Image Converter Buffer Overrun Vulnerability
A remote code execution vulnerability exists in the way Microsoft Office allocates memory when handling Computer Graphics Metafile (CGM) images contained in an Office document.

PICT Image Converter Integer Overflow Vulnerability
A remote code execution vulnerability exists in the way Microsoft Office allocates memory when handling Apple graphic file format (PICT) images contained in an Office document.

TIFF Image Converter Vulnerabilities (Heap Overflow, Buffer Overflow, Memory Corruption)Three remote code execution vulnerabilities exist in the way that Microsoft Office parses specially crafted Tagged Image File Format (TIFF) images contained in an Office document.

FlashPix Image Converter Vulnerabilities (Buffer Overflow, Heap Corruption)Two remote code execution vulnerabilities exist in the way that Microsoft Office parses specially crafted FlashPix (FPX) images contained in an Office document.

Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Failed exploitation could result in denial-of-service conditions.

RECOMMENDATIONS:
We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Remind users not to open e-mail attachments from unknown users or suspicious e-mails from trusted sources.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
 REFERENCES:
Microsoft:
http://www.microsoft.com/technet/security/bulletin/ms10-105.mspx

Security Focus:
http://www.securityfocus.com/bid/45270
http://www.securityfocus.com/bid/45273
http://www.securityfocus.com/bid/45274
http://www.securityfocus.com/bid/45275
http://www.securityfocus.com/bid/45278
http://www.securityfocus.com/bid/45283
http://www.securityfocus.com/bid/45285

CVE:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3945
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3946
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3947
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3949
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3950
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3951
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3952