External risk intelligence

Microsoft Windows Elevation of Privilege Vulnerability.

CVE advisoryKnown Exploit

CVE-2019-1215

A vulnerability in Windows' Winsock component could allow local attackers to escalate privileges. This impacts affected organizations by enabling unauthorized access and control of systems and data, posing a business risk.

1Halo Surface Signal

Microsoft Windows 10 1507

r2

External exposure likelihood

Halo Surface Signal score for CVE-2019-1215

This is a local elevation of privilege vulnerability residing in a Windows system component (ws2ifsl.sys). Exploitation requires an attacker to already have local access to the system. It is not remotely reachable over the public internet and does not present an exposed network service.

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability has been identified within the Windows operating system, specifically in how the Winsock component handles memory objects. This flaw could allow an attacker to gain higher privileges on a compromised system. The potential impact includes unauthorized access to sensitive data or the ability to perform actions beyond an attacker's normal permissions.

  • Vulnerable Windows component
  • Memory object handling flaw
  • Privilege escalation

Attack Path

How an attacker could exploit the issue

An elevation of privilege vulnerability exists in Windows that allows an attacker to gain higher permissions. This occurs when the ws2ifsl.sys component improperly handles objects in memory. Successful exploitation could allow an attacker to execute code with elevated privileges on an affected system.

  • Requires local system access.
  • Attacker triggers memory object handling.
  • Results in elevated control.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability allows an attacker with local access to a system to escalate their privileges. The attacker could then execute code with elevated permissions. This could lead to unauthorized access, modification, or deletion of sensitive data, and disruption of services.

  • Likely attacker skill level: Limited
  • Required access or conditions: Local system access
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability allows an attacker with local access to elevate their privileges on a system. The vulnerability resides in the way Windows handles objects in memory within the Winsock component. Successful exploitation could enable an attacker to execute code with elevated privileges on the affected system.

  • Identify affected assets.
  • Reduce exposure or isolate risk.
  • Fix, verify, and monitor.

Frequently asked questions

What is the role of ws2ifsl.sys in Windows, and how does it relate to network operations?

The ws2ifsl.sys component is integral to the Winsock (Windows Sockets API) in Microsoft Windows. Winsock serves as the interface that allows applications to perform network communications. This particular component is involved in the internal processes of how Windows manages network-related tasks and memory objects.

What specific weakness does CVE-2019-1215 represent, and what is its classification?

CVE-2019-1215 is classified as an elevation of privilege vulnerability. This type of weakness means that an attacker who has already obtained some level of access to a system can exploit this flaw to escalate their permissions, effectively gaining greater control or administrative rights.

How can an attacker exploit CVE-2019-1215, and what is the scope of impact?

Exploitation of CVE-2019-1215 requires an attacker to have local system access. The vulnerability arises from the way the ws2ifsl.sys component handles objects in memory. Successful exploitation allows an attacker to execute code with elevated privileges, potentially leading to unauthorized access or system control.

What is the significance of the Halo Surface Signal for CVE-2019-1215, and what does it indicate about its relevance?

The Halo Surface Signal indicates that CVE-2019-1215 is 'Very unlikely' to be a significant threat in terms of broad external impact. This is because it's a local elevation of privilege vulnerability within a core Windows component and requires an attacker to already have local access, rather than being remotely reachable.

What steps should be taken to address the CVE-2019-1215 vulnerability?

To address this vulnerability, organizations should first identify all affected Windows assets. Then, implement measures to reduce exposure or isolate the risk, such as applying vendor-provided security updates. Finally, verify that the fix has been applied successfully and continue to monitor the system for any signs of compromise.

References