CVE-2021-42980 : What You Need to Know

NoMachine Cloud Server is affected by a Buffer Overflow vulnerability that can allow local attackers to execute arbitrary code or cause denial of service.

Understanding CVE-2021-42980

NoMachine Cloud Server above version 4.0.346 and below 7.7.4 is vulnerable to a Buffer Overflow issue.

What is CVE-2021-42980?

The vulnerability exists in the IOCTL Handler 0x22001B of the NoMachine Cloud Server, enabling local attackers to execute malicious code in kernel mode or trigger a denial of service by manipulating I/O Request Packets.

The Impact of CVE-2021-42980

The impact of this vulnerability includes the execution of arbitrary code in the kernel mode or causing a denial of service, resulting in memory corruption and operating system crashes.

Technical Details of CVE-2021-42980

NoMachine Cloud Server is susceptible to a critical Buffer Overflow flaw.

Vulnerability Description

The vulnerability lies in the IOCTL Handler 0x22001B and can be exploited by local attackers to execute malicious code or disrupt services.

Affected Systems and Versions

NoMachine Cloud Server versions above 4.0.346 and below 7.7.4

Exploitation Mechanism

Attackers can exploit specially crafted I/O Request Packets to trigger the Buffer Overflow vulnerability.

Mitigation and Prevention

It is crucial to take immediate action to mitigate the risks posed by CVE-2021-42980.

Immediate Steps to Take

Update NoMachine Cloud Server to a secure version immediately.
Monitor and restrict network access to critical systems.
Implement strong authentication measures for system access.

Long-Term Security Practices

Conduct regular security audits and assessments.
Educate employees on cybersecurity best practices.
Implement network segmentation to contain potential threats.

Patching and Updates

Apply security patches provided by NoMachine promptly to fix the Buffer Overflow vulnerability.