A simple HTML tag will crash 64-bit Windows 7

0-day leaves kernel in the wrong iframe of mind


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. ®


Other stories you might like

  • 381,000-plus Kubernetes API servers 'exposed to internet'
    Firewall isn't a made-up word from the Hackers movie, people

    A large number of servers running the Kubernetes API have been left exposed to the internet, which is not great: they're potentially vulnerable to abuse.

    Nonprofit security organization The Shadowserver Foundation recently scanned 454,729 systems hosting the popular open-source platform for managing and orchestrating containers, finding that more than 381,645 – or about 84 percent – are accessible via the internet to varying degrees thus providing a cracked door into a corporate network.

    "While this does not mean that these instances are fully open or vulnerable to an attack, it is likely that this level of access was not intended and these instances are an unnecessarily exposed attack surface," Shadowserver's team stressed in a write-up. "They also allow for information leakage on version and build."

    Continue reading
  • A peek into Gigabyte's GPU Arm for AI, HPC shops
    High-performance platform choices are going beyond the ubiquitous x86 standard

    Arm-based servers continue to gain momentum with Gigabyte Technology introducing a system based on Ampere's Altra processors paired with Nvidia A100 GPUs, aimed at demanding workloads such as AI training and high-performance compute (HPC) applications.

    The G492-PD0 runs either an Ampere Altra or Altra Max processor, the latter delivering 128 64-bit cores that are compatible with the Armv8.2 architecture.

    It supports 16 DDR4 DIMM slots, which would be enough space for up to 4TB of memory if all slots were filled with 256GB memory modules. The chassis also has space for no fewer than eight Nvidia A100 GPUs, which would make for a costly but very powerful system for those workloads that benefit from GPU acceleration.

    Continue reading
  • GitLab version 15 goes big on visibility and observability
    GitOps fans can take a spin on the free tier for pull-based deployment

    One-stop DevOps shop GitLab has announced version 15 of its platform, hot on the heels of pull-based GitOps turning up on the platform's free tier.

    Version 15.0 marks the arrival of GitLab's next major iteration and attention this time around has turned to visibility and observability – hardly surprising considering the acquisition of OpsTrace as 2021 drew to a close, as well as workflow automation, security and compliance.

    GitLab puts out monthly releases –  hitting 15.1 on June 22 –  and we spoke to the company's senior director of Product, Kenny Johnston, at the recent Kubecon EU event, about what will be added to version 15 as time goes by. During a chat with the company's senior director of Product, Kenny Johnston, at the recent Kubecon EU event, The Register was told that this was more where dollars were being invested into the product.

    Continue reading

Biting the hand that feeds IT © 1998–2022