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             AUSCERT External Security Bulletin Redistribution

 Vulnerability in Silverlight Could Allow Remote Code Execution (2814124)
                               12 March 2013


        AusCERT Security Bulletin Summary

Product:           Microsoft Silverlight
Publisher:         Microsoft
Operating System:  Windows
                   OS X
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-0074  

Original Bulletin: 

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Microsoft Security Bulletin MS13-022 - Critical

Vulnerability in Silverlight Could Allow Remote Code Execution (2814124)

Published Date: March 12, 2013

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft
Silverlight. The vulnerability could allow remote code execution if an attacker
hosts a website that contains a specially crafted Silverlight application that
could exploit this vulnerability and then convinces a user to view the website. 
The attacker could also take advantage of compromised websites and websites 
that accept or host user-provided content or advertisements. Such websites 
could contain specially crafted content that could exploit this vulnerability. 
In all cases, however, an attacker would have no way to force users to visit a 
website. Instead, an attacker would have to convince users to visit a website, 
typically by getting them to click a link in an email message or in an Instant 
Messenger message that takes them to the attacker's website. It could also be 
possible to display specially crafted web content by using banner 
advertisements or by using other methods to deliver web content to affected 

This security update is rated Critical for Microsoft Silverlight 5 and 
Microsoft Silverlight 5 Developer Runtime when installed on Mac and all 
supported releases of Microsoft Windows.

Affected Software

Microsoft Silverlight 5
Microsoft Silverlight 5 Developer Runtime

Silverlight Double Dereference Vulnerability - CVE-2013-0074

A remote code execution vulnerability exists in Microsoft Silverlight that can
allow a specially crafted Silverlight application to access memory in an unsafe
manner. An attacker who successfully exploited this vulnerability could run 
arbitrary code in the security context of the current user. An attacker could 
then install programs; view, change, or delete data; or create new accounts
with full user rights. Users whose accounts are configured to have fewer user
rights on the system could be less impacted than users who operate with 
administrative user rights.

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