Feeds

Exploit code targets unpatched Windows flaw

Persistence of memory

5 things you didn’t know about cloud backup

Hackers have developed proof-of-concept code that attempts to take advantage of an unpatched Windows vulnerability to crash systems, Microsoft warned yesterday. Fortunately the risk of attack is low.

The experimental code shows it's possible to knock over machines running Windows XP SP1 and Windows 2000 SP4 in certain configurations by taking advantage of flaws in Windows memory allocation functions. This vulnerability manifests itself when a malformed request is made to the UPnP service in the data section of a call to the GetDeviceList function. In handling this request, memory consumption on vulnerable Windows boxes increase to the point where the system becomes unresponsive. Repeated requests can therefore be used to mount denial of service attacks.

Attacks on Windows XP SP1 would rely on having user authentication, reducing the scope for mischief by remote hackers. Microsoft users running Windows XP Service Pack 2, Windows Server 2003 and Windows Server 2003 Service Pack 1 are not affected by the vulnerability. Win 2000 shops are most at risk but providing systems are properly firewalled then attacks should fail.

Irresponsible disclosure?

Normally the arrival of proof-of-concept illustrates weaknesses that might subsequently by used by hackers for more malign purposes. In this case, however, the attack approach is not especially successful in slowing down systems to a crawl much less as a means to infect vulnerable machines with hostile code. This is a denial of service only risk and the real interest (except to people interested in revisiting the long-running debate about the responsible disclosure of security bugs) is that it is based on an unpatched vulnerability.

Winny Thomas of Nevis Labs in India, the security researcher who developed the proof-of-concept code, readily concedes the Windows RPC memory allocation remote denial of service exploit he highlights is only a moderate risk. Microsoft is yet to develop a security fix. It criticises Thomas of publicising details of the flaw through FrSIRT, a full disclosure web site, instead of submitting it to Microsoft directly first. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
One HUNDRED FAMOUS LADIES exposed NUDE online
Celebrity women victimised as Apple iCloud accounts reportedly popped
Rubbish WPS config sees WiFi router keys popped in seconds
Another day, another way in to your home router
Goog says patch⁵⁰ your Chrome
64-bit browser loads cat vids FIFTEEN PERCENT faster!
NZ Justice Minister scalped as hacker leaks emails
Grab your popcorn: Subterfuge and slur disrupts election run up
NIST to sysadmins: clean up your SSH mess
Too many keys, too badly managed
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Researchers camouflage haxxor traps with fake application traffic
Honeypots sweetened to resemble actual workloads, complete with 'secure' logins
Attack flogged through shiny-clicky social media buttons
66,000 users popped by malicious Flash fudging add-on
New Snowden leak: How NSA shared 850-billion-plus metadata records
'Federated search' spaffed info all over Five Eyes chums
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Advanced data protection for your virtualized environments
Find a natural fit for optimizing protection for the often resource-constrained data protection process found in virtual environments.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.