Pete Freitag Pete Freitag

HashDOS and ColdFusion


Earlier this week at the 28C3 security conference in Berlin researchers presented on a denial of service (DOS) technique that several web application platforms (PHP, ASP.NET, Node.js, Tomcat, Java's HashMap/Hashtable etc) are vulnerable to, known as hashdos.

The exploit takes advantage of hash collisions in the internal implementation of hashtables / hashmaps (think CFML struct). When two keys are hashed and result in the same hash code a collision occurrs, and additional processing must take place to store or retrieve the item. Most application servers store request input variable (eg form, url scopes) in such a data structure. If you can construct a request with variable names that all have the same internal hashcode, the request goes from taking less than a second to process to several minutes.

As you can imagine this can cause a server to crawl/crash pretty quickly with a relatively small payload. Microsoft has released an out of band security patch for ASP.NET already. Tomcat has provided a work around in versions 7.0.23 or 6.0.35 and up.

The typical patch / workaround for this issue is to limit the number of input request variables, ASP.NET defaults this limit to 1000, tomcat defaults to 10,000.

Update: - Adobe has released a security hotfix to address this issue on ColdFusion 8 and 9. If you are running CF 6 or 7 you may still be vulnerable to this but Adobe no longer produces security hotfixes for these versions (upgrade to CF 8 or above).

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HashDOS and ColdFusion was first published on December 30, 2011.

If you like reading about coldfusion, java, tomcat, hashdos, hash, security, or jrun then you might also like:

FuseGuard Web App Firewall for ColdFusion

The FuseGuard Web Application Firewall for ColdFusion & CFML is a high performance, customizable engine that blocks various attacks against your ColdFusion applications.


We have released a security hot-fix addressing this issue for ColdFusion 9.0.1 and earlier. More details are
by Shilpi on 03/13/2012 at 11:47:20 AM UTC

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