Test RIA cross domain policy (OTG-CONFIG-008)
This article is part of the new OWASP Testing Guide v4.
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Rich Internet Applications (RIA) have adopted Adobe's crossdomain.xml policy files in order to allow for controlled cross domain access to data and service consumption using technologies such as Oracle Java, Silverlight, and Adobe Flash. Therefore, a domain can grant remote access to its services from a different domain. However, often the policy files that describe the access restrictions are poorly configured. Poor configuration of the policy files enables Cross-site Request Forgery attacks, and may allow third parties to access sensitive data meant for the user.
Description of the Issue
What are crossdomain.xml policy files
How can crossdomain.xml poilicy files be abused
Impact of abusing crossdomain.xml policy files
Black Box testing and example
Testing for RIA policy files weakness:
- Adobe: "Cross-domain policy file specification" - http://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html
- Stefan Esser: "Poking new holes with Flash Crossdomain Policy Files" http://www.hardened-php.net/library/poking_new_holes_with_flash_crossdomain_policy_files.html
- Jeremiah Grossman: "Crossdomain.xml Invites Cross-site Mayhem" http://jeremiahgrossman.blogspot.com/2008/05/crossdomainxml-invites-cross-site.html