This is a quick write up of the Django webchallenge from PlaidCTF 2011.
Web application is a guestbook written using Django and can be found at: http://a12.amalgamated.biz/DjangoProblem1
Upon investigation it turns out they have pagecaching in Django enabled using Memcache. Memcache is a key/value store accessible over TCP. The memcache server is publicly accessible on the default memcached port 11211.
Some snooping around on the memcached server reveals Django uses python serialized objects in the cache. Serialized objects in the memcache keystore have a flag of ‘1’. (We missed this detail for a long time :/)