We have just found out that the same defacement is appearing at at least one other site, mawjcamp.org. We are not able to see what was at this domain before, but it is now displaying the same defacement that Twitter was only a few minutes ago.
Twitter does not have the best record with security issues. We have previously covered a number of incidents, and as recently as two months ago their web servers were misconfigured to reveal detailed internal network information. We also previously wrote about their admin interface having a password of ‘password’ on one account, and the well-known Twitter doc incident. It was hoped that with the hiring of a new COO, Dick Costolo, as well as a number of other high-level engineers, including security experts, that Twitter had grown out of the phase of being vulnerable to security incidents on such a large scale.
We do not know a lot about the group claiming responsibility for the attack as we haven’t heard their name before and they do not show up in any defacement mirrors or security sites. Similar Iranian groups were active during the election campaign in that country. We have emailed the group (they were kind enough to leave an address on the defacement) for a comment (also added them on Gchat – worth a shot).