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 PC World newsletter!

Error: Please check your email address.

Tags Internet-based applications and servicesYahooapplicationssecuritye-mailMailsoftwareExploits / vulnerabilitiesinternet

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

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

Essentials

Microsoft L5V-00027 Sculpt Ergonomic Keyboard Desktop

Learn more >

Lexar® JumpDrive® S57 USB 3.0 flash drive

Learn more >

Mobile

Lexar® JumpDrive® S45 USB 3.0 flash drive 

Learn more >

Exec

Lexar® Professional 1800x microSDHC™/microSDXC™ UHS-II cards 

Learn more >

Audio-Technica ATH-ANC70 Noise Cancelling Headphones

Learn more >

HD Pan/Tilt Wi-Fi Camera with Night Vision NC450

Learn more >

Lexar® JumpDrive® C20c USB Type-C flash drive 

Learn more >

Budget

Back To Business Guide

Click for more ›

Most Popular Reviews

Latest News Articles

Resources

PCW Evaluation Team

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Aysha Strobbe

Windows 10 / HP Spectre x360

Ultimately, I think the Windows 10 environment is excellent for me as it caters for so many different uses. The inclusion of the Xbox app is also great for when you need some downtime too!

Mark Escubio

Windows 10 / Lenovo Yoga 910

For me, the Xbox Play Anywhere is a great new feature as it allows you to play your current Xbox games with higher resolutions and better graphics without forking out extra cash for another copy. Although available titles are still scarce, but I’m sure it will grow in time.

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?