Feeds

How poor crypto housekeeping left OpenID open to abuse

Internet bouncer snooze leads to 'small earthquake'

Choosing a cloud hosting partner with confidence

Slipshod cryptographic housekeeping left some OpenID services far less secure than they ought to be.

OpenID is a shared identity service that enables users to eliminate the need for punters to create separate IDs and logins for websites that support the service. A growing number of around 9,000 websites support the decentralised service, which offers a a URL-based system for single sign-on.

Security researchers discovered the websites run by three OpenID providers - including Sun Microsystems - used SSL certificates with weak crypto keys. Instead of being generated from billions of possibilities, the keys came from a a set of just 32,768 options, due to a flaw in the random number generation routines used by Debian. The bug, which has been dormant on systems for 18 months, was discovered and corrected back in May.

Keys generated by cryptographically flawed systems still needed to be replaced even after the software was upgraded. But recent research by Ben Laurie of Google reveals that 1.5 per cent of certificates he looked at contained weak keys. Three OpenID providers (openid.sun.com, xopenid.net and openid.net.nz) were among the guilty parties.

To exploit the vulnerability, malicious hackers would need to trick surfers into visiting a site impersonating a pukka OpenID provider. But faking digital certificate alone wouldn't do the trick without first misdirecting surfers to these bogus sites. Dan Kaminsky's recent discovery of a DNS cache poisoning flaw made it far more plausible to construct an attack that sent surfers the wrong away around the net's address lookup system, potentially to a bogus Open site posing as the real deal.

The security flaw meant that even cautious users who check SSL certificates were at risk of handing over their OpenID credentials as part of a phishing attack. Such an attack would take a lot of effort to pull off and would only yield OpenID login credentials, which aren't especially useful for hackers and are difficult to monetise.

Going after online banking credentials via a site that makes no attempt to offer up fake SSL certificates is a far more reliable moneyspinner, a factor that leads noted security researcher Richard Clayton to describe the attack as the "modern equivalent of a small earthquake in Chile".

Sun has responded to the issue by generating a new secure key, which reduces the scope for mischief but still leaves potential problems from the old key.

More thoughts on the cryptographically interesting - though not especially life-threatening - flaw can be found in Clayton's posting on Cambridge University's Light the Blue Touchpaper blog here. A security advisory by Laurie and Clayton explaining the issue in greater depth can be found here. ®

Top 5 reasons to deploy VMware with Tegile

More from The Register

next story
You really need to do some tech support for Aunty Agnes
Free anti-virus software, expires, stops updating and p0wns the world
Regin: The super-spyware the security industry has been silent about
NSA fingered as likely source of complex malware family
You stupid BRICK! PCs running Avast AV can't handle Windows fixes
Fix issued, fingers pointed, forums in flames
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Patch NOW! Microsoft slings emergency bug fix at Windows admins
Vulnerability promotes lusers to domain overlords ... oops
HACKERS can DELETE SURVEILLANCE DVRS remotely – report
Hikvision devices wide open to hacking, claim securobods
prev story

Whitepapers

Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Designing and building an open ITOA architecture
Learn about a new IT data taxonomy defined by the four data sources of IT visibility: wire, machine, agent, and synthetic data sets.
How to determine if cloud backup is right for your servers
Two key factors, technical feasibility and TCO economics, that backup and IT operations managers should consider when assessing cloud backup.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?