In-Reply-To: <19084321117.20030909100957@mail.ru> >Tuesday, September 9, 2003, 1:43:59 AM, you wrote: > >kyf> Hello, i've just found a new xss vulnerability in phpBB 2.0.6 (i'm not >kyf> sure but i don't think that others versions are vulnerable). >kyf> This vulnerability is located in the [url][/url] bbcode. >kyf> You can insert javascript by doing a thing like that: >kyf> [url=www.google.fr" onclick=alert('Hello')]text[/url] > > Think, my phpBB 2.0.5 is not vulnerable. > I posted "[url=www.google.fr" onclick=alert('Hello')]text[/url]" into > the body of the post. No URL link appeared, but I saw the whole > string "[url=www.google.fr" onclick=alert('Hello')]text[/url]" in my > post. > > Was I wrong? Where do we need to place that string? All 2.0.x are vulnerable - that string is missing a quote before the javascript code, as phpBB will quote the beginning of the string and the end of it on it's own (so your quote at the end should not be there either). Although browsers will ignore onclick for A, they won't ignore onblur and so on. So yes, it's vulnerable. The fix is somewhat simple though, I don't see why the phpBB folks are taking so long, this is a critical bug. -- Omer Efraim