CVE-2021-42986 Explained : Impact and Mitigation

NoMachine Enterprise Client is affected by an Integer Overflow vulnerability that allows local attackers to execute arbitrary code in kernel mode or cause a denial of service. Learn more about this CVE below.

Understanding CVE-2021-42986

What is CVE-2021-42986?

NoMachine Enterprise Client version above 4.0.346 and below 7.7.4 is vulnerable to an Integer Overflow in IOCTL Handler 0x22001B. This vulnerability enables local attackers to exploit specially crafted I/O Request Packets.

The Impact of CVE-2021-42986

The security issue allows attackers to run malicious code in kernel mode or disrupt system operation, leading to memory corruption or system crashes.

Technical Details of CVE-2021-42986

Vulnerability Description

The Integer Overflow vulnerability in NoMachine Enterprise Client versions allows for arbitrary code execution or denial of service attacks via specially crafted I/O Request Packets.

Affected Systems and Versions

NoMachine Enterprise Client above 4.0.346 and below 7.7.4

Exploitation Mechanism

By manipulating I/O Request Packets, local attackers can trigger memory corruption or system crashes in NoMachine Enterprise Client.

Mitigation and Prevention

Immediate Steps to Take

Apply vendor-supplied patches or updates for NoMachine Enterprise Client.
Monitor system logs for signs of exploitation.

Long-Term Security Practices

Regularly update software and systems to prevent vulnerabilities.
Implement network segmentation and access controls.

Patching and Updates

Install the latest version of NoMachine Enterprise Client to address the Integer Overflow vulnerability.