28C3 - Version 2.3.5

28th Chaos Communication Congress
Behind Enemy Lines

Speakers
Alexander ‘alech’ Klink
Julian | zeri
Schedule
Day Day 2 - 2011-12-28
Room Saal 1
Start time 14:00
Duration 01:00
Info
ID 4680
Event type Lecture
Track Hacking
Language used for presentation English
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Effective Denial of Service attacks against web application platforms

We are the 99% (CPU usage)

This talk will show how a common flaw in the implementation of most of the popular web programming languages and platforms (including PHP, ASP.NET, Java, etc.) can be (ab)used to force web application servers to use 99% of CPU for several minutes to hours for a single HTTP request.

This attack is mostly independent of the underlying web application and just relies on a common fact of how web application servers typically work.