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Mikhail Shcherbakov
July 05, 2015
Sandboxing in .NET CLRMikhail Shcherbakov
IT Global Meetup #6
IntelliEgg
Creator of IntelliDebugger projectCoordinator of SPB .NET CommunityFormer Product manager and Team lead at Cezurity, Positive Technologies, Acronis, Luxoft, Boeing
About me
2
Sandboxing is the base of security
Development of extensible and security-sensitive applications
Troubleshooting and knowledge about the internals
Knowledge in Practice
ASP.NET / IIS Silverlight SQL CLR XBAP ClickOnce Sharepoint
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Security Architecture
4
Security Architecture
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Application Domains
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The verification process
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Just-in-time verification
Code Access Security
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Policy
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deprecated
in .NET Framework
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Policy
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Permissions
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Permissions
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Enforcement
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Fully Trusted code in Partially Trusted AppDomain
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Transparency Model
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Level 2 Security Transparency
CriticalFull Trust code that can do anything
Safe CriticalFull Trust code Provides access to Critical code
TransparentOnly verifiable code Cannot p/invoke Cannot
elevate/assert
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Security Transparency Attributes
Assembly Level
Type Level
Member Level
SecurityTransparent SecuritySafeCritical SecurityCritical AllowPartiallyTrustedCallers
SecAnnotate.exe – .NET Security Annotator Tool http://bit.ly/1A3vMw3
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Stack walking
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Sandbox implementation
ASP.NET Partial Trust applications
2005 2005 2006 2007 2008 2009 2010 2011 2012
Use Medium trust in shared hosting environments bit.ly/1yABGqfAugust 2005
For Web servers that are Internet-facing, Medium trust is recommended bit.ly/1z83LVVJuly 2008
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ASP.NET Partial Trust applications
20152008 2009 2010 2011 2012 2013
ASP.NET Partial Trust does not guarantee application isolationbit.ly/1CRv3UxJune 2012
ASP.NET Security and the Importance of KB2698981 in Cloud Environments bit.ly/1vXJ50JApril 2013
“The official position of the ASP.NET team is that Medium Trust is obsolete”
-Levi Broderick, security developer at Microsoft bit.ly/1If14Gv
June 2013ASP.NET MVC 5 no longer supports partial trust bit.ly/1w0xxuX
October 2013
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DynamicMethod classMS13-015 vulnerability
Could Allow Elevation of Privilege (KB2800277)
Trusted Chain Attack
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Luring Attack
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Luring AttackMS02-061 “Elevation of Privilege in SQL Server Web Tasks”
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Exception Filter Attack
Exception Filter Attack
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Exception Filter Attack
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Summary
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Sandboxing:Exploring the .NET Framework 4 Security Model bit.ly/1zBHDl7
New Security Model: Moving to a Better Sandbox bit.ly/1qdLTYf
How to Test for Luring Vulnerabilities bit.ly/1G5asdG
Using SecAnnotate to Analyze Your Assemblies for Transparency Violations bit.ly/12AtGZF
Summary
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.NET Security:OWASP Top 10 for .NET developers bit.ly/1mpvG9R
OWASP .NET Project bit.ly/1vCfknmTroy Hunt blog www.troyhunt.comThe WASC Threat Classification v2.0 bit.ly/1G5d8rM
Summary
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Thank you for your attention!Mikhail Shcherbakov
spbdotnet.orglinkedin.com/in/mikhailshcherbakovgithub.com/yuske@yu5k3
IntelliEgg
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