Feeds

Outlook Express in crypto processing flaw

Lookout Express

  • alert
  • submit to reddit

Top 5 reasons to deploy VMware with Tegile

Code used to authenticate messages to Outlook Express users might be turned against them by attackers to run hostile code on victims' machines.

Microsoft's latest security advisory warns that a buffer overflow flaw in the Outlook Express S/MIME parsing functions "could enable system compromise". Redmond has issued a patch.

Yes, it's yet another critical security flaw, affecting only Outlook Express users. Other email clients, including Outlook, are immune.

Microsoft's advisory is vague about the precise cause of the problem. To authenticate messages, Outlook Express supports digital signing of messages through S/MIME.

The fault here lies in the code that generates the warning message when a particular error condition associated with digital signatures occurs.

Because of this buffer overflow bug, an attacker could create a digitally signed email and editing it to introduce specific data, which exploits the buffer overflow bug. This would either cause the email client to fail or, much more seriously, cause the mail client to run code of their choice on a user's machine.

This vulnerability could only affect messages that are signed using S/MIME and sent to an Outlook Express user. Credit for finding the flaw goes to Noam Rathaus of Beyond Security. ®

Internet Security Threat Report 2014

More from The Register

next story
'Kim Kardashian snaps naked selfies with a BLACKBERRY'. *Twitterati gasps*
More alleged private, nude celeb pics appear online
Home Depot ignored staff warnings of security fail laundry list
'Just use cash', former security staffer warns friends
Hackers pop Brazil newspaper to root home routers
Step One: try default passwords. Step Two: Repeat Step One until success
UK.gov lobs another fistful of change at SME infosec nightmares
Senior Lib Dem in 'trying to be relevant' shocker. It's only taxpayers' money, after all
Spies would need SUPER POWERS to tap undersea cables
Why mess with armoured 10kV cables when land-based, and legal, snoop tools are easier?
Who.is does the Harlem Shake
Blame it on LOLing XSS terroristas
Snowden, Dotcom, throw bombs into NZ election campaign
Claim of tapped undersea cable refuted by Kiwi PM as Kim claims extradition plot
Freenode IRC users told to change passwords after securo-breach
Miscreants probably got in, you guys know the drill by now
THREE QUARTERS of Android mobes open to web page spy bug
Metasploit module gobbles KitKat SOP slop
prev story

Whitepapers

Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
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?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.