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Coastal Network Status - Issue Detail
Security
Alert

Vulnerability in Microsoft Silverlight Could Allow Remote Code Execution
Posted: March 13, 2013, 2:48 pm
Last Updated: May 22, 2013, 1:12 pm

South Carolina Information Sharing and Analysis Center

 

SC INFORMATION SHARING AND ANALYSIS CENTER BULLETIN

 

DATE ISSUED:        3/12/2013

                                               

SUBJECT:                 Vulnerability in Microsoft Silverlight Could Allow Remote Code Execution

 

OVERVIEW:

 

A vulnerability has been discovered in the Microsoft Silverlight which could allow an attacker to take complete control of an affected system. Microsoft Silverlight is a web application framework that provides support for .NET applications and used for streaming media. The vulnerabilities can be exploited if a user visits or is redirected to a malicious web page, or runs a specially crafted Silverlight application.

 

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.

 

 

DESCRIPTION:

 

A vulnerability has been discovered in Microsoft Silverlight which could allow an attacker to take complete control of an affected system. The vulnerability is caused by Silverlight incorrectly checking a memory pointer when rendering an HTML object. The vulnerability can be exploited by opening a specially crafted Silverlight web application.

 

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.

 

 

SYSTEM AFFECTED:

  • Microsoft Silverlight 5

 

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

 

RECOMMENDATIONS:

 

We recommend the following actions be taken:

 

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Consider uninstalling Silverlight if there is no business need.
  • Block Silverlight content at the organization's perimeter.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Apply the principle of Least Privilege to all services.

 

 

REFERENCES:

 

Microsoft:

http://technet.microsoft.com/en-us/security/bulletin/ms13-022


CVE:

 

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0074

 

Security Focus:

http://www.securityfocus.com/bid/58327

 

 

Please feel free to contact the SC ISAC if you have any questions or need any additional information.

 

The SC ISAC will provide amplifying information as it becomes available.

 

SC-ISAC Contact Information

 

Email: SC-ISAC@cio.sc.gov

SC ISAC Security Line: 803-896-1650

24-hour hotline: +1 803-896-0001 Option 2

Fax: +1 803-896-0375

 

Postal address:

 

SC-ISAC

DSIT Budget and Control Board

4430 Broad River Road

Columbia S.C. 29210

SC-ISAC is available via hotline 08:00-17:00 EST (GMT-5)/ EDT (GMT-4)

Monday through Friday

 

 

 

Using Encryption

 

We strongly urge you to encrypt sensitive information sent by email. Our

public PGP key is available from:

 

https://sc-isac.sc.gov/public.key

 

NO WARRANTY

 

Any material furnished by SC-ISAC is furnished on an "as is" basis.

 

SC-ISAC makes no warranties of any kind, either expressed or implied as to

any matter including, but not limited to, warranty of fitness for a particular

purpose or merchantability, exclusivity or results obtained from use of the

material. SC-ISAC does not make any warranty of any kind with respect to

freedom from patent, trademark, or copyright infringement.

 

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