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Firefox 1.0/1.1 bug? - brad's life — LiveJournal [entries|archive|friends|userinfo]
Brad Fitzpatrick

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Firefox 1.0/1.1 bug? [May. 8th, 2005|05:28 am]
Brad Fitzpatrick
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Both Firefox 1.0.3 and the almost-1.1 nightly builds have an interesting feature/bug.

You can dynamically load JavaScript (from any URL) from Javascript and Firefox won't send along the HTTP Referer (sic) header.

Test with, say:
function js_include (uri) {
  var se = document.createElement("script");
  se.src = uri;
  document.body.appendChild(se);
}

....

js_include("http://victim.example.com/");
Now, imagine if every LJ page contained that. Every LJ user could be DoS'ing some other site, with no Referer header saying we requested it.

Dear Lazyweb, tell me what other browsers do/send. I'd go upstairs and use IE on Dina's laptop but I'm too lazy to install ethereal on it. Plus I should go back to bed.

Update: Couldn't sleep. Results:

Firefox/1.0.2 (Debian package 1.0.2-2): No Referer
Firefox/1.0.1 (Windows): Referer
IE 6: Referer

So is this a regression from 1.0.1 to 1.0.2, or is it a Linux/Windows thing?

Update#2:
Firefox/1.0.1 (Linux, not Debian): No Referer

Looking like a Linux thing.
LinkReply

Comments:
From: legolas
2005-05-11 08:49 pm (UTC)
What I don't get is how a relatively platform independent and 'high level' thing like sending a referrer header can be platform dependant (or at least the bugs in it are)...
(Reply) (Parent) (Thread)
[User Picture]From: brad
2005-05-11 11:07 pm (UTC)
I know! I don't get it either... just reporting what I saw.
(Reply) (Parent) (Thread)