Horizon Alert
Summary of the vulnerability and why it matters
Microsoft Internet Explorer contains a use-after-free vulnerability within the CDisplayPointer class. This flaw can allow attackers to execute arbitrary code or cause denial of service by corrupting memory. The vulnerability can be triggered through specially crafted JavaScript code.
- Vulnerable component: Microsoft Internet Explorer
- Core weakness: Memory corruption vulnerability
- Main business impact: Arbitrary code execution or denial of service
Attack Path
How an attacker could exploit the issue
This vulnerability can be exploited through crafted JavaScript code on a web page. When a user visits a malicious website, the vulnerable code in Internet Explorer can be triggered. This process allows an attacker to gain control of the affected system, potentially leading to the execution of arbitrary code or a denial of service.
- Unprotected Internet Explorer browser
- Attacker directs user to malicious site
- JavaScript triggers memory corruption, attacker gains control
Live Threat
Current exploitation, exposure, and threat context
The organization faces a significant risk due to a memory corruption vulnerability in Microsoft Internet Explorer. Attackers can exploit this by tricking users into visiting a malicious website, potentially leading to arbitrary code execution or denial of service. The widely distributed nature of Internet Explorer across various Windows operating systems means many organizations could be impacted.
- Attackers require low skill.
- Exploitation requires user interaction.
- Business risk is high and urgent.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
A use-after-free vulnerability in Microsoft Internet Explorer could allow attackers to execute arbitrary code or cause a denial of service. This occurs when a specially crafted JavaScript code is used with the onpropertychange event handler. The vulnerability has been exploited in the wild.
- Locate all instances of Internet Explorer.
- Block access to malicious websites.
- Apply vendor security updates.
- Confirm vulnerability remediation.
- Monitor for related malicious activity.
