Feeds

Yahoo! email! hijack! exploit!... Yours! for! $700!

Cybercrook: It's a bargain, guys... They usually cost way more

3 Big data security analytics techniques

A cross-site scripting (XSS) flaw on Yahoo! Mail creates a means to steal cookies and hijack accounts, according to a hacker who is offering to sell an alleged zero-day vulnerability exploit for $700.

The cybercrook, who uses the online nickname TheHell, knocked up a video to market the exploit which he is attempting to sell through Darkode, an underground cybercrime bazaar. The clip was captured and reposted on YouTube by security blogger Brian Krebs.

The video explains that the attack works by tricking a victim into clicking on a maliciously crafted link. This link supposedly exploits a cross-site scripting bug to steal the victim's Yahoo! mail cookies, which a cybercrook can later use to log into and hijack compromised Yahoo! webmail accounts.

TheHell claims the exploit works on all browsers and is a bargain at the not inconsiderable sum of $700.

I'm selling Yahoo stored xss that steal Yahoo emails cookies and works on ALL browsers. And you don’t need to bypass IE or Chrome xss filter as it do that itself because it’s stored xss. Prices around for such exploit is $1,100 – $1,500, while I offer it here for $700. Will sell only to trusted people cuz I don't want it to be patched soon!

Yahoo! is investigating the alleged vulnerability, following a tip-off from Krebs. The video advertising the exploit fails to explain which vulnerable URL would trigger the attack, something that's proving a little hard to pin down.

Yahoo!'s director of security, Ramses Martinez, told Krebs: "Fixing it is easy, most XSS are corrected by simple code change. ... Once we figure out the offending URL we can have new code deployed in a few hours at most."

Yahoo! has yet to respond to our request for an update on the situation. We'll update this story as and when we hear more.

XSS flaws are a perennial web security problem that are a permanent fixture in the Open Web Application Security Project's (OWASP) list of Top 10 Application Security Risks. Top tips for guarding against this class of vulnerability by OWASP can be found here.

Xssed.com, a site that collates reported XSS attacks, has several previous examples of XSS flaws on Yahoo! pages and hundreds of examples of flaws on other sites. Scripting bugs vary greatly in their potency, so judging impact by numbers alone is bound to be misleading.

More commentary on the Yahoo! webmail flaws and cross-site scripting more generally can be found in a blog post by Lisa Vaas for the Sophos Naked Security blog here. ®

3 Big data security analytics techniques

More from The Register

next story
Obama allows NSA to exploit 0-days: report
If the spooks say they need it, they get it
Samsung Galaxy S5 fingerprint scanner hacked in just 4 DAYS
Sammy's newbie cooked slower than iPhone, also costs more to build
Putin tells Snowden: Russia conducts no US-style mass surveillance
Gov't is too broke for that, Russian prez says
Snowden-inspired crypto-email service Lavaboom launches
German service pays tribute to Lavabit
Mounties always get their man: Heartbleed 'hacker', 19, CUFFED
Canadian teen accused of raiding tax computers using OpenSSL bug
One year on: diplomatic fail as Chinese APT gangs get back to work
Mandiant says past 12 months shows Beijing won't call off its hackers
Call of Duty 'fragged using OpenSSL's Heartbleed exploit'
So it begins ... or maybe not, says one analyst
Arts and crafts store Michaels says 3 million credit cards exposed in breach
Meanwhile, Target investigators prepare for long process in nabbing hackers
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.