michal, is that a feature or a bug? maybe it is not obivous to me what you are doing but it i feel that it is almost like asking the user to bookmark a bookmarklet. of course it is a security problem if you execute untrusted bookmarklet on a page :). On 2/21/07, Michal Zalewski <lcamtuf@xxxxxxxxxxxx> wrote:
There is an interesting vulnerability in how Firefox handles bookmarks. The flaw allows the attacker to steal credentials from commonly used browser start sites (for Firefox, Google is the seldom changed default; that means exposure of GMail authentication cookies, etc). The problem: it is relatively easy to trick a casual user into bookmarking a window that does not point to any physical location, but rather, is an inline data: URL scheme. When such a link is later retrieved, Javascript code placed therein will execute in the context of a currently visited webpage. The destination page can then continue to load without the user noticing. The impact of such a vulnerability isn't devastating, but as mentioned earlier, any attention-grabbing webpage can exploit this to silently launch attacks against Google, MSN, AOL credentials, etc. In an unlikely case the victim is browsing local files or special URLs before following a poisoned bookmark, system compromise is possible. Thanks to Piotr Szeptynski for bringing up the subject of bookmarks and inspiring me to dig into this. Self-explanatory demo page: http://lcamtuf.coredump.cx/ffbook/ This is being tracked as: https://bugzilla.mozilla.org/show_bug.cgi?id=371179 /mz http://lcamtuf.coredump.cx _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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