CIS CYBER SECURITY ADVISORIES

MS-ISAC CYBER SECURITY ADVISORY NUMBER:
2012-032

DATE(S) ISSUED:
05/08/2012

SUBJECT:
Vulnerabilities in Microsoft Visio Viewer 2010 Could Allow Remote Code Execution (MS12-031)

OVERVIEW:

A vulnerability in Microsoft Visio Viewer has been identified that could allow for remote code execution. Microsoft Visio is aprogram commonly used to develop flowcharts, network diagrams and other visual media that can be used in Office-based products. 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.

SYSTEMS AFFECTED:

  • Microsoft Visio Viewer 2010

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: Medium

DESCRIPTION:

A vulnerability has been identified in Microsoft Visio that could result in remote code execution. This vulnerability exists due to the way Microsoft Visio validates attributes when handling a specially crafted Visio file (.VSD). This particular vulnerability could allow for exploitation through direct execution of the file or by visiting a website hosting a specially crafted VSD file.

In the email-based scenario, the user would have to open the specially crafted Visio file as an email attachment. In the Web based scenario, a user would visit a website and then open the specially crafted Visio filethat is hosted on the page.

Successful exploitation could allow an attacker to gain 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.

RECOMMENDATIONS:
We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • 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.
  • Inform and educate users regarding the threats posed by attachments and hypertext links contained in emails especially from un-trusted sources.

References:

Microsoft:
http://technet.microsoft.com/en-us/security/bulletin/ms12-031

SecurityFocus:
http://www.securityfocus.com/bid/53328

CVE:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0018