Feeds

Yahoo! Saves! Trolls! From! Session! Jacking! Holes!

Cross site scripting SNAFU infected myriad Purple Palace comment pages

  • alert
  • submit to reddit

Providing a secure and efficient Helpdesk

Yahoo! has patched a cross site scripting (XSS) flaw in the commenting system it uses across many of its properties.

The internet giant squished two attack vectors affecting a laundry list of Yahoo! services covering topics as diverse as shopping and sport two weeks after they were reported on May 2nd.

Californian web dev and security researcher Behrouz Sadeghipour found attackers could steal Yahoo! users session cookies and tokens by injecting code into the comment system.

In a disclosure he said the attack could have been used with a bot to compromise users en masse.

"The websites ... will store the string and present it to anyone visiting the post containing the comment," Sadeghipour said.

"So with a sample bot we could post a comment containing malicious code to hijack the visitors' session cookie.

"We could also simply target a specific user by linking them to a post containing a comment with a malicious code by the attacker."

All Yahoo! top level domains were affected by the stored XSS attacks placing thousands of daily commenters at risk.

Sadeghipour also found a less dangerous self-XSS which could be placed in the comments section and engineered to target users by appearing under the 'most recent' or 'most discussed' fields.

Cross site scripting flaws littered the internet and could cause varying degrees of damage. At its most severe, users can be served malware or have accounts compromised, as the video below showe.

Proof of Concept video

Web admins should consult OWASP for guidance to remove the vulnerabilities from their sites. ®

New hybrid storage solutions

More from The Register

next story
Google recommends pronounceable passwords
Super Chrome goes into battle with Mr Mxyzptlk
Apple Pay is a tidy payday for Apple with 0.15% cut, sources say
Cupertino slurps 15 cents from every $100 purchase
Reddit wipes clean leaked celeb nudie pics, tells users to zip it
Now we've had all THAT TRAFFIC, we 'deplore' this theft
Infosec geniuses hack a Canon PRINTER and install DOOM
Internet of Stuff securo-cockups strike yet again
YouTube, Amazon and Yahoo! caught in malvertising mess
Cisco says 'Kyle and Stan' attack is spreading through compromised ad networks
TorrentLocker unpicked: Crypto coding shocker defeats extortionists
Lousy XOR opens door into which victims can shove a foot
Greater dev access to iOS 8 will put us AT RISK from HACKERS
Knocking holes in Apple's walled garden could backfire, says securo-chap
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.