Yahoo email patch ineffective, security researchers say

Yahoo fixed an XSS flaw in its email application earlier this week but it apparently doesn't repair the problem

Security researchers say a patch released by Yahoo earlier this week for a serious email vulnerability did not fix the problem, leaving users at risk.

The cross-site scripting flaw was found by Shahin Ramezany, who goes by the nickname "Abysssec." The vulnerability can allow an attacker to harvest a victim's cookie for their Yahoo account if the victim is successfully tricked into clicking on a malicious link.

The vulnerability was patched by Yahoo on Monday, but penetration testing company Offensive Security and Ramezany say that the patch did not fix the problem.

"With little modification to the original proof-of-concept code written by Abysssec, it is still possible to exploit the original Yahoo vulnerability, allowing an attacker to completely take over a victim's account," Offensive Security wrote on its blog.

A Yahoo spokeswoman did not have an immediate comment when contacted Wednesday.

Offensive Security hosted a video showing how the attack works but left out details that might allow attackers to replicate it. The company said XSS filters provide little defense against an attack and warned that people should be wary of clicking on links within emails until Yahoo fixes the vulnerability.

Send news tips and comments to jeremy_kirk@idg.com. Follow me on Twitter: @jeremy_kirk

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags internetsoftwareapplicationse-mailMailYahooInternet-based applications and servicesExploits / vulnerabilities

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Jeremy Kirk

IDG News Service
Show Comments

Cool Tech

Toys for Boys

Family Friendly

Stocking Stuffer

SmartLens - Clip on Phone Camera Lens Set of 3

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Michael Hargreaves

Microsoft Office 365/Dell XPS 15 2-in-1

I’d recommend a Dell XPS 15 2-in-1 and the new Windows 10 to anyone who needs to get serious work done (before you kick back on your couch with your favourite Netflix show.)

Maryellen Rose George

Brother PT-P750W

It’s useful for office tasks as well as pragmatic labelling of equipment and storage – just don’t get too excited and label everything in sight!

Cathy Giles

Brother MFC-L8900CDW

The Brother MFC-L8900CDW is an absolute stand out. I struggle to fault it.

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Featured Content

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?