External risk intelligence

Microsoft Internet Explorer Code Execution Risk.

CVE advisoryKnown Exploit

CVE-2017-0149

Microsoft Internet Explorer contains a memory corruption vulnerability that permits remote attackers to execute arbitrary code or cause a denial of service via a crafted website. The realistic business risk involves unauthorized code execution and system instability impacting affected organizations and their data.

4Halo Surface Signal

Out-of-bounds Write

Microsoft Internet Explorer

91011

External exposure likelihood

Halo Surface Signal score for CVE-2017-0149

The vulnerability affects Internet Explorer, a web browser designed specifically to navigate and interact with the public internet. While it requires user interaction to visit a crafted website, the product's primary role is to act as an interface for public web content, making exploitation via internet-reachable, web-based delivery common.

Horizon Alert

Summary of the vulnerability and why it matters

Microsoft Internet Explorer contains a memory corruption vulnerability that allows remote attackers to execute arbitrary code or cause a denial of service. This issue arises from flaws in how the browser handles memory when encountering specially crafted websites. The potential impact includes unauthorized code execution and system instability.

  • Internet Explorer
  • Memory corruption flaw
  • Code execution, denial of service

Attack Path

How an attacker could exploit the issue

This vulnerability allows attackers to impact organizations by corrupting memory in Internet Explorer. This can lead to the execution of arbitrary code or a denial of service, affecting system stability and data integrity. The attack involves presenting a specially crafted website to an unsuspecting user.

  • Exposure condition: Network access to a crafted website.
  • Attacker starting point: Remote.
  • Trigger and result: User visits website, leading to code execution or denial of service.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow attackers to execute arbitrary code or cause a denial of service on affected systems. Exploitation requires an attacker to present a crafted website to a user. The potential for widespread impact and the nature of the vulnerability suggest a significant risk to organizations.

  • Attacker skill level: Low
  • Required access or conditions: User visits malicious website
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Microsoft Internet Explorer could allow attackers to execute code or cause a denial of service on affected systems. The impact of this vulnerability is memory corruption, which can be exploited through a crafted web page. Organizations should take immediate steps to identify and address this risk.

  • Find affected Internet Explorer assets.
  • Reduce exposure or isolate risk.
  • Apply vendor fix, verify, and monitor.

Frequently asked questions

What is Microsoft Internet Explorer and what is it used for?

Microsoft Internet Explorer was a web browser used for navigating and interacting with websites on the internet. It allowed users to access online content, use web applications, and communicate through web-based platforms.

What type of vulnerability does CVE-2017-0149 describe?

CVE-2017-0149 describes a memory corruption vulnerability in Microsoft Internet Explorer. This type of weakness, categorized as CWE-787, occurs when a program writes data beyond the allocated memory buffer, potentially allowing an attacker to execute arbitrary code or cause a denial of service.

How can an attacker exploit this CVE-2017-0149 vulnerability?

An attacker can exploit this vulnerability by convincing a user to visit a specially crafted website. The vulnerability is not triggered if a user does not visit such a website.

Who should be concerned about CVE-2017-0149?

Organizations with internet-facing systems that may host or encounter web content are at risk. Because Internet Explorer is designed for browsing the public internet, this vulnerability has a high likelihood of being exploited through web-based delivery.

What are the first steps to address this vulnerability?

Organizations should first identify all systems running affected versions of Internet Explorer. Then, they should take steps to reduce exposure or isolate the risk, and finally, apply vendor-provided updates to remediate the vulnerability.

References