CVE-2021-42977 : Vulnerability Insights and Analysis

NoMachine Enterprise Desktop is affected by an Integer Overflow vulnerability. Local attackers can exploit this to execute arbitrary code in kernel mode or trigger a denial of service.

Understanding CVE-2021-42977

NoMachine Enterprise Desktop vulnerability with potential severe consequences.

What is CVE-2021-42977?

Integer Overflow vulnerability in IOCTL Handler 0x22001B in NoMachine Enterprise Desktop version above 4.0.346 and below 7.7.4
Allows local attackers to execute malicious code in kernel mode or cause memory corruption and OS crash via specially crafted I/O Request Packet

The Impact of CVE-2021-42977

Local attackers can execute arbitrary code in kernel mode
Potential denial of service attack through memory corruption and OS crash

Technical Details of CVE-2021-42977

Details about the vulnerability and affected systems.

Vulnerability Description

Integer Overflow vulnerability in IOCTL Handler 0x22001B
Affects NoMachine Enterprise Desktop versions above 4.0.346 and below 7.7.4

Affected Systems and Versions

NoMachine Enterprise Desktop versions above 4.0.346 and below 7.7.4

Exploitation Mechanism

Attackers exploit specially crafted I/O Request Packets to trigger the vulnerability

Mitigation and Prevention

Measures to address and prevent the CVE-2021-42977 vulnerability.

Immediate Steps to Take

Apply security patches provided by NoMachine promptly
Monitor system logs for any suspicious activities
Implement least privilege access for users to limit potential damage

Long-Term Security Practices

Regularly update and patch all software and systems
Conduct security training and awareness programs for users and IT staff
Employ network segmentation to contain potential attacks

Patching and Updates

Install the latest version of NoMachine Enterprise Desktop to eliminate the vulnerability