External risk intelligence

Windows Common Log File System Driver Privilege Escalation

CVE advisoryKnown Exploit

CVE-2022-24521

A vulnerability in the Windows Common Log File System Driver allows an attacker with local access to escalate privileges. This impacts various Windows systems, potentially leading to unauthorized access and control, affecting data integrity and availability.

1Halo Surface Signal

Out-of-bounds Write

Microsoft Windows 10 1507

before 10.0.10240.19265before 10.0.14393.506610.0.17763.2803 and earlierbefore 10.0.18363.2212before 10.0.19042.1645before 10.0.19043.1645before 10.0.19044.1645before 10.0.22000.613;...

External exposure likelihood

Halo Surface Signal score for CVE-2022-24521

This vulnerability resides within the Windows Common Log File System (CLFS) driver, which is a local operating system component. Exploitation requires local access to the system, making it inherently local and not reachable via public internet exposure.

Horizon Alert

Summary of the vulnerability and why it matters

The Windows Common Log File System Driver contains a flaw that could allow an attacker to gain elevated privileges on a system. This vulnerability affects various versions of Windows operating systems and server products. Successful exploitation could lead to unauthorized access and control over affected systems, potentially impacting data integrity and system availability.

  • Vulnerable Windows logging driver
  • Allows privilege escalation
  • Business risk of unauthorized access

Attack Path

How an attacker could exploit the issue

This vulnerability allows an attacker with local access to elevate their privileges on a Windows system. The attack targets the Windows Common Log File System driver, which is used for logging. By exploiting a flaw in this driver, an attacker can gain higher levels of access than they initially possessed. This could lead to unauthorized actions on the system, impacting data integrity and confidentiality.

  • Local system access required.
  • Exploit trigger and impact unknown.
  • Attacker gains elevated privileges.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in the Windows Common Log File System Driver could allow an attacker to gain elevated privileges on a compromised system. The attack vector is local, meaning an attacker must have existing access to the affected machine to exploit this vulnerability. The potential impact includes unauthorized access and modification of system data and functions, posing a significant business risk.

  • Attacker skill level: Low
  • Required access or conditions: Local access
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

The Windows Common Log File System Driver vulnerability presents a risk of privilege escalation for affected organizations. This vulnerability allows an attacker with local access to gain higher privileges on the system, potentially impacting data confidentiality, integrity, and system availability. Organizations should prioritize addressing this issue to mitigate potential business risks.

  • Identify all Windows systems with the affected CLFS driver.
  • Reduce exposure by limiting local administrative access.
  • Apply vendor security updates and validate remediation.
  • Monitor systems for suspicious activity.

Frequently asked questions

What is the Windows Common Log File System (CLFS) Driver?

The Windows Common Log File System (CLFS) driver is a component of the Windows operating system used for managing and writing log files. It provides a reliable logging infrastructure for various Windows services and applications. The CLFS driver allows applications to write log data in a structured and efficient manner.

What type of weakness is CVE-2022-24521?

CVE-2022-24521 is a buffer overflow vulnerability. This type of weakness occurs when a program attempts to write more data into a buffer than it can hold, potentially overwriting adjacent memory and leading to crashes or code execution.

What conditions are needed to exploit CVE-2022-24521?

Exploiting this vulnerability requires an attacker to have local access to the affected Windows system. It does not trigger remotely over a network. The exact conditions for exploitation are not detailed, but it involves interacting with the CLFS driver on the local machine.

Who should be concerned about this vulnerability?

Anyone running affected Windows versions should be concerned. According to Halo Surface Signal, this vulnerability is classified as internal, meaning an attacker needs local access to a system to exploit it. This limits its reach to systems that an attacker can already access directly.

What is the first step to address CVE-2022-24521?

The primary step is to identify all Windows systems that use the affected CLFS driver. Following that, organizations should apply security updates provided by Microsoft for the relevant Windows versions to mitigate the risk of privilege escalation.

References