OpenSSL fixes DoS flaw introduced by critical DTLS patch

OpenSSL fixed a denial-of-service vulnerability introduced by a patch to prevent DTLS plain text recovery attacks

The OpenSSL Project has released new versions of the popular OpenSSL library in order to address a denial-of-service (DoS) vulnerability that was introduced by a critical patch issued on Jan. 6.

"A flaw in the fix to CVE-2011-4108 can be exploited in a denial of service attack," the OpenSSL developers warned in a newly published advisory. The issue has been addressed in the new OpenSSL 1.0.0g and 0.9.8t versions released on Wednesday.

CVE-2011-4108 refers to a serious vulnerability in OpenSSL's implementation of the DTLS (Datagram Transport Layer Security) protocol, which allows attackers to decrypt secured communications without knowing the encryption key.

The vulnerability was discovered by Nadhem Alfardan and Kenny Paterson of the Information Security Group at Royal Holloway, University of London (RHUL), while investigating weaknesses in the CBC (Cipher-block chaining) mode of operation.

The researchers plan to present their "padding oracle attack" against DTLS at the 19th Annual Network & Distributed System Security (NDSS) Symposium in February. Padding oracle attacks work by analyzing timing differences that arise during the decryption process in order to recover plain text from encrypted communications.

Users who have not yet upgraded to OpenSSL 1.0.0f or 0.9.8s in order to protect their DTLS applications against CVE-2011-4108, are advised to upgrade directly to the newly released OpenSSL 1.0.0g or 0.9.8t.

OpenSSL is available for a wide variety of platforms, including Linux, Solaris, Mac OS X, BSD, Windows and OpenVMS. Some of these operating systems include OpenSSL by default and deliver updates for it through their own channels.

Join the PC World newsletter!

Error: Please check your email address.

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.

Lucian Constantin

IDG News Service
Show Comments

Essentials

Lexar® JumpDrive® S57 USB 3.0 flash drive

Learn more >

Microsoft L5V-00027 Sculpt Ergonomic Keyboard Desktop

Learn more >

Mobile

Lexar® JumpDrive® S45 USB 3.0 flash drive 

Learn more >

Exec

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

Learn more >

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

Learn more >

Audio-Technica ATH-ANC70 Noise Cancelling Headphones

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

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

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.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?