Firefox broken Jar vuln. menaces Gmail
Jar Jar links peril
Security watchers are concerned that a protocol handling flaw in Firefox could have implications for the security of data held within Google and, possibly, other web applications.
The flaw, involving the handling of the "jar:" protocol by Firefox, gives rise to cross-site scripting attacks. No patch is available through there are a number of workarounds (such as blocking URIs that contain "jar:" using a reverse proxy or application firewall). For home users, Secunia advises users to avoid following untrusted "jar:" links or visiting untrusted websites.
The jar: protocol is used to extract and render content from ZIP compressed files. Unfortunately the "jar:" protocol handler in Firefox does not validate the MIME type of the contents of an archive, which are then executed in the context of the site hosting the archive.
The trick might be used to conduct cross-site scripting attacks on sites that allow a user to upload certain files, such as .zip or .png.
As the GNUCitizen blog notes application which allow the upload of JAR/ZIP files are potentially vulnerable to a persistent Cross-site Scripting as a result of the bug. Web mail clients, collaboration systems, document sharing systems are all potential targets on attack.
The attack could be used to steal cookie-based authentication credentials, for example. GNUCitizen has published a proof of concept demo that illustrates how a user's contact book in Gmail might be accessed using the approach.
Suitably the results page of the demo is illustrated with a picture of insufferably annoying (and arguably racist) Star Wars character Jar Jar Binks. ®
Shame you left out the NoScript advice
The ONLY fix currently available is the NoScript plugin according to the US Cert advisory (www.kb.cert.org/vuls/id/715737).
I know NoScript can be a pain on some sites - I've even (*shudder*) had to revert to IE to use some of them - but I value my security over the issues, particularly as my kids use IM, mySpace and other social networks so much.
btw the original report on this was made by Jesse Ruderman in February. Why has it taken so long to not produce a fix?
What's this got to do with Gmail?
The media scaremongers have infiltrated The Register! Red alert!
You forgot to include Paris Hilton in the subject. I'm sure this affects her too someway. Maybe she drinks java coffee and has an outfit made of fox skin? ;-)
The latest version of the Firefox browser
..isn't it called no-web?
O hang on - that was the last one - or was that slo-mo web?
I installed it once - tried to use it and was convinced someone had sneaked in and replaced the DSL line with a standard dial-up modem.