Microsoft squashes Hotmail hijack bug

By Darren Pauli on May 1, 2012 7:55 AM
Filed under Security

Accounts cracked in 60 seconds.

Microsoft has crushed a vulnerability in Hotmail that allowed attackers to hijack accounts using a Firefox extension.

The bug was actively exploited on cybercrime forums last month by users who boasted the ability to crack any Hotmail account in less than a minute.

Some charged around $20 for the service, security researcher Naveen Thakur said.

The attack was simplified through the Tamper Data Firefox extension, which helped hijackers exploit a weakness in the way Hotmail issued password resets. The exploit allowed attackers to bypass the recovery feature and issue a password of their choosing.

Researchers at Vulnerability Lab said the token system designed to secure the reset procedure "only checks if a value is empty then blocks or closes the web session".

"Successful exploitation results in unauthorised MSN or Hotmail account access."

Attackers could use positive values in the token system to bypass the security feature, decode the CAPTCHA anti-spam feature and send automated values to the MSN Live Hotmail module.

Vulnerability Labs discovered the flaw and reported it to Microsoft about ten days later.

Redmond's security team took only a day to fix the flaw.

Follow us on Facebook and Twitter

Copyright © SC Magazine, Australia


Microsoft squashes Hotmail hijack bug
Top Stories
Channel's best mingle at 2015 CRN Fast50 networking drinks
[Photos] Who was at the Four Seasons, Sydney on 26 November?
Revealed: The 2015 CRN Fast50!
Meet the fastest-growing IT service providers in Australia.
Sign up to receive CRN email bulletins
Was your most important vendor the same in 2015 as in 2014?

Latest Comments
CRN Magazine

Issue: 343 | October 2015

CRN Magazine looks in-depth at the emerging issues and developments for the channel, and provides insight, analysis and strategic information to help resellers better run their businesses.