External risk intelligence

Microsoft Windows Local Privilege Escalation Vulnerability

CVE advisoryKnown Exploit

CVE-2016-0040

A vulnerability in the Microsoft Windows kernel allows local users to gain elevated privileges. Attackers can exploit this by running a crafted application, potentially leading to unauthorized access and modification of system data. The risk is limited to systems with existing local access.

1Halo Surface Signal

Microsoft Windows 7

r2

External exposure likelihood

Halo Surface Signal score for CVE-2016-0040

This vulnerability is limited to local exploitation on the host operating system. It requires an attacker to already have local access to execute a crafted application, making it inherently not reachable via the public internet or network services.

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability affects the Microsoft Windows kernel. A flaw within the kernel can be exploited by a local user through a specially crafted application. This exploit could allow an attacker to gain elevated privileges on the affected system.

  • Microsoft Windows kernel
  • Local privilege escalation flaw
  • Unauthorized system access

Attack Path

How an attacker could exploit the issue

This vulnerability allows an attacker to gain elevated privileges on a system. The attack requires the attacker to have already gained some level of access to the targeted system. Once local access is established, the attacker can execute a specially crafted application that exploits the vulnerability. This action results in the attacker gaining control of the system with higher privileges than they initially possessed.

  • Requires local system access.
  • Attacker runs a crafted application.
  • Attacker gains elevated privileges.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability allows local users to gain elevated privileges on affected Windows operating systems through a crafted application. Successful exploitation could lead to unauthorized access and modification of system data or functions. The impact is contained to systems where an attacker already possesses local access.

  • Likely attacker skill level: Low
  • Required access or conditions: Local system access
  • Business risk or urgency: Moderate

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Microsoft Windows systems may be affected by a privilege escalation vulnerability. This could allow local users to gain elevated permissions on affected systems by executing a crafted application. This increases the risk of unauthorized access and modification of sensitive data.

  • Identify Windows 7, Windows Vista, and Windows Server 2008 systems.
  • Restrict local access to these systems.
  • Apply vendor security updates and verify.
  • Monitor for unusual activity.

Frequently asked questions

What is the Microsoft Windows kernel and what is CVE-2016-0040?

The Microsoft Windows kernel is the core of the operating system, managing system resources. CVE-2016-0040 is a vulnerability in this kernel that allows a local user with a crafted application to gain higher privileges on the system.

What kind of weakness does CVE-2016-0040 represent?

CVE-2016-0040 represents a privilege escalation vulnerability. This means an attacker can use it to gain elevated access rights on a system they already have some level of access to.

How can an attacker exploit CVE-2016-0040?

An attacker must first have local access to the targeted Windows system. They can then run a specially crafted application to trigger the vulnerability and elevate their privileges. This bug is not triggered by simply browsing or remote network access.

Who should be concerned about CVE-2016-0040?

Organizations running affected versions of Windows Vista, Windows 7, or Windows Server 2008 should be concerned. Since exploitation requires local access, it's considered an internal threat rather than an internet-facing one.

What is the first step to respond to this vulnerability?

The first step is to identify all instances of Windows 7, Vista, and Windows Server 2008 within your environment and apply the security updates provided by Microsoft for this vulnerability.

References