Feeds

A simple HTML tag will crash 64-bit Windows 7

0-day leaves kernel in the wrong iframe of mind

Secure remote control for conventional and virtual desktops

An unpatched critical flaw in 64-bit Windows 7 leaves computers vulnerable to a full 'blue screen of death' system crash.

The memory corruption bug in x64 Win 7 could also allow malicious kernel-level code to be injected into machines, security alert biz Secunia warns. Fortunately the 32-bit version of Windows 7 is immune to the flaw, which has been pinned down to the win32k.sys operating system file - which contains the kernel portion of the Windows user interface and related infrastructure.

Proof-of-concept code showing how to crash vulnerable Win 7 boxes has been leaked: the simple HTML script, when opened in Apple's Safari web browser, quickly leads to the kernel triggering a page fault in an unmapped area of memory, which halts the machine at a blue screen of death.

The offending script is just an IFRAME tag with an overly large height attribute. Although Safari is required to spark the system crash via HTML, modern operating systems should not allow usermode applications to bring down the machine. Microsoft is now investigating the vulnerability, which was first reported by Twitter user w3bd3vil, although the software giant is racing against hackers tracing the code execution path to discover the underlying vulnerability in Windows 7.

A video of the Safari-triggered crash along with the HTML PoC can be seen here. Other exploit scenarios might also be possible. ®

Providing a secure and efficient Helpdesk

More from The Register

next story
Microsoft on the Threshold of a new name for Windows next week
Rebranded OS reportedly set to be flung open by Redmond
Business is back, baby! Hasta la VISTA, Win 8... Oh, yeah, Windows 9
Forget touchscreen millennials, Microsoft goes for mouse crowd
SMASH the Bash bug! Apple and Red Hat scramble for patch batches
'Applying multiple security updates is extremely difficult'
Apple: SO sorry for the iOS 8.0.1 UPDATE BUNGLE HORROR
Apple kills 'upgrade'. Hey, Microsoft. You sure you want to be like these guys?
ARM gives Internet of Things a piece of its mind – the Cortex-M7
32-bit core packs some DSP for VIP IoT CPU LOL
Lotus Notes inventor Ozzie invents app to talk to people on your phone
Imagine that. Startup floats with voice collab app for Win iPhone
'Google is NOT the gatekeeper to the web, as some claim'
Plus: 'Pretty sure iOS 8.0.2 will just turn the iPhone into a fax machine'
prev story

Whitepapers

A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
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.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.