Just to keep things on topic.

For me the key points are:
- SS3 requires admin privileges to flush the entire cache (expected)
- SS3 does not require admin privileges to flush the current page cache
(unexpected)
- as Chris has outlined, a DoS attack using the ?flush=1 string results in
a dramatically increased server load and response time when compared to a
standard cached request
- this issue has be known since Feb 2013
- currently (as in *today*) SS core devs are working on a fix which will be
pushed to master and 3.1
- there are also some tips on the github issue that suggest .htaccess and
apache config workarounds in the interim (
https://github.com/silverstripe/silverstripe-framework/issues/1692#issuecomment-21151232
)

Paul

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