Feeds

Firefox broken Jar vuln. menaces Gmail

Jar Jar links peril

Using blade systems to cut costs and sharpen efficiencies

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. ®

The smart choice: opportunity from uncertainty

More from The Register

next story
NEW, SINISTER web tracking tech fingerprints your computer by making it draw
Have you been on YouPorn lately, perhaps? White House website?
HIDDEN packet sniffer spy tech in MILLIONS of iPhones, iPads – expert
Don't panic though – Apple's backdoor is not wide open to all, guru tells us
LibreSSL RNG bug fix: What's all the forking fuss about, ask devs
Blow to bit-spitter 'tis but a flesh wound, claim team
Black Hat anti-Tor talk smashed by lawyers' wrecking ball
Unmasking hidden users is too hot for Carnegie-Mellon
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
Don't look, Snowden: Security biz chases Tails with zero-day flaws alert
Exodus vows not to sell secrets of whistleblower's favorite OS
Own a Cisco modem or wireless gateway? It might be owned by someone else, too
Remote code exec in HTTP server hands kit to bad guys
prev story

Whitepapers

Seven Steps to Software Security
Seven practical steps you can begin to take today to secure your applications and prevent the damages a successful cyber-attack can cause.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.