External risk intelligence

Windows Cloud Files Driver Privilege Escalation

CVE advisoryKnown Exploit

CVE-2023-36036

A vulnerability in the Windows Cloud Files Mini Filter Driver allows local attackers to gain SYSTEM privileges. This could affect the confidentiality, integrity, and availability of systems and data. Organizations should identify affected systems and apply vendor-provided fixes.

1Halo Surface Signal

Out-of-bounds Write

Microsoft Windows 10 1507

before 10.0.10240.20308before 10.0.14393.6452before 10.0.17763.5122before 10.0.19041.3693before 10.0.19045.3693before 10.0.22000.2600before 10.0.22621.2715r2before 10.0.20348.2113

External exposure likelihood

Halo Surface Signal score for CVE-2023-36036

This vulnerability resides within a Windows kernel-mode driver (Cloud Files Mini Filter Driver). Exploitation requires local, authenticated access to the target system to interact with the driver. It is not reachable via the public internet, nor is it a network-facing service or application.

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability exists within the Windows Cloud Files Mini Filter Driver. This flaw allows an attacker with local access to escalate their privileges to SYSTEM level. Such an escalation could impact the confidentiality, integrity, and availability of systems and data.

  • Vulnerable Windows driver component
  • Privilege escalation flaw
  • Unauthorized system control

Attack Path

How an attacker could exploit the issue

The Windows Cloud Files Mini Filter Driver vulnerability allows for privilege escalation. Attackers can leverage this vulnerability to gain elevated permissions on a compromised system. This impacts the integrity and confidentiality of affected systems and data.

  • Local access required for exposure.
  • Attacker triggers vulnerability for access.
  • Achieves elevated control.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability affects Microsoft Windows operating systems and could allow an attacker to gain elevated privileges on a compromised system. The exploitation requires an attacker to have already gained some level of access to the affected machine. Organizations should consider this a high-risk vulnerability due to the potential for significant system compromise, enabling further malicious activity.

  • Likely attacker skill level: High
  • Required access or conditions: Local access
  • Business risk or urgency: High risk, urgent

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability within the Windows Cloud Files Mini Filter Driver could allow an attacker with local access to elevate their privileges on affected systems. Organizations should prioritize understanding their exposure by identifying all systems utilizing this driver. Implementing vendor-provided fixes and verifying their successful application are crucial next steps to mitigate risk and maintain system integrity.

  • Identify systems using the driver.
  • Reduce exposure or isolate systems.
  • Apply vendor fix and verify.
  • Monitor for related activity.

Frequently asked questions

What is the Windows Cloud Files Mini Filter Driver component mentioned in CVE-2023-36036?

The Windows Cloud Files Mini Filter Driver is a system component in Microsoft Windows. It manages file operations, particularly for cloud storage integration, enabling features like synchronization and access control.

How does CVE-2023-36036 facilitate privilege escalation?

CVE-2023-36036 is a weakness that allows elevation of privilege. An attacker with initial limited access can exploit this flaw to gain higher permissions, potentially reaching the highest level of control (SYSTEM) on Windows.

What is the attack path for CVE-2023-36036?

Exploitation of this vulnerability requires local, authenticated access to the affected system. The attacker interacts with the driver to trigger the weakness, gaining elevated control without needing network access.

Why is CVE-2023-36036 relevant to organizations?

This vulnerability affects many Microsoft Windows versions and allows attackers with existing local access to gain SYSTEM privileges. Such a compromise can lead to significant data integrity and confidentiality risks, demanding urgent attention.

What steps should be taken to address CVE-2023-36036?

Organizations should identify all systems using the vulnerable driver, apply Microsoft's provided fixes, and verify their successful implementation. Monitoring for related activity is also recommended to ensure continued system integrity.

References