Feeds

Windows 0day allows malicious code execution

Potential 'nightmare'

3 Big data security analytics techniques

Antimalware provider Prevx has sounded the alarm about a serious vulnerability in fully patched versions of Microsoft Windows. It allows attackers to execute malware, even in versions designed to withstand such exploits.

Technical details have already been published on a Chinese forum, leading to speculation that it won't be long before attackers exploit it in the wild.

“This could potentially become a nightmare due to the nature of the flaw,” Prevx researcher Marco Giuliani wrote here. “We expect to see this exploit being actively used by malwares very soon – it's an opportunity that malware writers surely won't miss.”

The flaw resides in the win32k.sys part of the Windows kernel and results from an API known as NtGdiEnableEUDC that fails to properly vet user input for harmful content. Attackers can exploit the bug to redirect overwritten return memory addresses to malicious code, which is then executed with kernel mode privileges. As a result, the flaw allows even users or processes with limited privileges to execute code will elevated rights.

“Being a privilege escalation exploit, it bypasses by design even the protection given by the User Account Control technology implemented in Windows Vista and Windows 7,” Giuliani said. “All Windows XP/Vista/7 both 32 and 64 bit are vulnerable to this attack.”

Microsoft "is aware of the issue and it is under investigation," according to a statement, which a spokeswoman attributed to Jerry Bryant, Group Manager of the company's Response Communications.

On Wednesday evening, Microsoft Security Response tweeted: "We're investigating public PoC for a local EoP vuln requiring an account on the target system."

No further details were available at time of writing. If confirmed, the unpatched vulnerability would be the second known 0day to affect a widely used piece of Microsoft software. Earler this month, researchers unearthed an unrelated security bug in earlier versions of Internet Explorer that is being exploited on compromised websites. ® ®

This article was updated to include MSR's tweet.

3 Big data security analytics techniques

More from The Register

next story
Obama allows NSA to exploit 0-days: report
If the spooks say they need it, they get it
Samsung Galaxy S5 fingerprint scanner hacked in just 4 DAYS
Sammy's newbie cooked slower than iPhone, also costs more to build
Putin tells Snowden: Russia conducts no US-style mass surveillance
Gov't is too broke for that, Russian prez says
Snowden-inspired crypto-email service Lavaboom launches
German service pays tribute to Lavabit
Mounties always get their man: Heartbleed 'hacker', 19, CUFFED
Canadian teen accused of raiding tax computers using OpenSSL bug
One year on: diplomatic fail as Chinese APT gangs get back to work
Mandiant says past 12 months shows Beijing won't call off its hackers
Call of Duty 'fragged using OpenSSL's Heartbleed exploit'
So it begins ... or maybe not, says one analyst
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.