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 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.
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

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

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.

Laura Johnston

MSI GS65 Stealth Thin

If you can afford the price tag, it is well worth the money. It out performs any other laptop I have tried for gaming, and the transportable design and incredible display also make it ideal for work.

Andrew Teoh

Brother MFC-L9570CDW Multifunction Printer

Touch screen visibility and operation was great and easy to navigate. Each menu and sub-menu was in an understandable order and category

Louise Coady

Brother MFC-L9570CDW Multifunction Printer

The printer was convenient, produced clear and vibrant images and was very easy to use

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Walid Mikhael

Brother QL-820NWB Professional Label Printer

It’s easy to set up, it’s compact and quiet when printing and to top if off, the print quality is excellent. This is hands down the best printer I’ve used for printing labels.

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?