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Mozilla Foundation Security Advisory 2008-10

Title: URL token stealing via stylesheet redirect
Impact: Low
Announced: February 7, 2008
Reporter: Martin Straka
Products: Firefox, SeaMonkey

Fixed in: Firefox 2.0.0.12
  SeaMonkey 1.1.8

Description

Security researcher Martin Straka reported that Gecko-based browsers update the .href property of stylesheet DOM nodes to reflect the final URI of the stylesheet after following any 302 redirects (much as the document.location property is updated). This differs from other browsers and could potentially reveal sensitive URL parameters, such as those used by Single-signon sytems, to scripts on the page.

Workaround

Disable JavaScript until a version containing these fixes can be installed.

References