Feeds

Firefox broken Jar vuln. menaces Gmail

Jar Jar links peril

Seven Steps to Software Security

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. ®

Mobile application security vulnerability report

More from The Register

next story
Yorkshire cops fail to grasp principle behind BT Fon Wi-Fi network
'Prevent people that are passing by to hook up to your network', pleads plod
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
NEW, SINISTER web tracking tech fingerprints your computer by making it draw
Have you been on YouPorn lately, perhaps? White House website?
LibreSSL RNG bug fix: What's all the forking fuss about, ask devs
Blow to bit-spitter 'tis but a flesh wound, claim team
Attackers raid SWISS BANKS with DNS and malware bombs
'Retefe' trojan uses clever spin on old attacks to grant total control of bank accounts
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
Mozilla fixes CRITICAL security holes in Firefox, urges v31 upgrade
Misc memory hazards 'could be exploited' - and guess what, one's a Javascript vuln
Don't look, Snowden: Security biz chases Tails with zero-day flaws alert
Exodus vows not to sell secrets of whistleblower's favorite OS
prev story

Whitepapers

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.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Reducing security risks from open source software
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
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.