Feeds

Twitter attack exposes awesome power of clickjacking

Hard to stop, harder to resist

Security for virtualized datacentres

A worm that forced a wave of people to unintentionally broadcast messages on microblogging site Twitter shows the potential of a vulnerability known as clickjacking to dupe large numbers of internet users into installing malware or visiting malicious pages without any clue they're being attacked.

The outbreak was touched off by tweets that led Twitter readers to a button labeled "Don't click." Gullible users (including your reporter) who clicked on the button automatically posted messages that posted yet more tweets advertising the link. The attacks persisted even after Twitter added countermeasures to its site and proclaimed the issued fixed.

The attack exploited a vulnerability at the core of the web that allows webmasters to trick users into clicking on one link even though the underlying HTML code appears to show it leads elsewhere. The so-called clickjacking exploit is pulled off by superimposing an invisible iframe over a button or link. Virtually every website and browser is susceptible to the technique. Technical details are available here.

"Before, it was more theoretical," security researcher Jeremiah Grossman said of clickjacking. "Now, this is evidence that it can be used and it's only a matter of time before it's used maliciously."

Grossman, who is CTO of web-security firm WhiteHat Security, first sounded the clickjacking alarm in September, along with Robert "RSnake" Hansen, CEO of secTheory.com. They say it can be used to trick users into believing a link leads to, say, Google when in fact it leads to a money-transfer page, a banner advertisement that's part of a click-fraud scheme, or any other page an attacker chooses.

Their research has led to security updates in Adobe's Flash software, but clickjacking remains a threat on virtually every platform, browser, and website, they warn. More recently, Microsoft has added anti-clickjacking protections to its Internet Explorer 8 browser, which is currently in beta. While that's a step in the right direction, some critics have contended the protection will be ineffective because it will require millions of websites to update their pages with proprietary code.

The Twitter attack lends some credence to claims that clickjacking will be hard to stop. Twitter developers on Thursday added code to its pages that were designed to neutralize frames placed in Twitter pages by changing the pages' location. "Problem should be gone," Twitter's network operations manager declared shortly afterward. Within hours, the exploit code had been modified to work around the countermeasure.

Twitter has once again managed to block the attack, but we're confident this isn't the last we'll hear of clickjacking on that site - and plenty of others. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
NASTY SSL 3.0 vuln to be revealed soon – sources (Update: It's POODLE)
So nasty no one's even whispering until patch is out
Russian hackers exploit 'Sandworm' bug 'to spy on NATO, EU PCs'
Fix imminent from Microsoft for Vista, Server 2008, other stuff
Forget passwords, let's use SELFIES, says Obama's cyber tsar
Michael Daniel wants to kill passwords dead
FBI boss: We don't want a backdoor, we want the front door to phones
Claims it's what the Founding Fathers would have wanted – catching killers and pedos
Kill off SSL 3.0 NOW: HTTPS savaged by vicious POODLE
Pull it out ASAP, it is SWISS CHEESE
Facebook slurps 'paste sites' for STOLEN passwords, sprinkles on hash and salt
Zuck's ad empire DOESN'T see details in plain text. Phew!
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Win a year’s supply of chocolate
There is no techie angle to this competition so we're not going to pretend there is, but everyone loves chocolate so who cares.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.