PT-2021-23706 · Nomachine · Nomachine Cloud Server

Kasif Dekel · Published 2021-12-07 · Updated 2021-12-08 · CVE-2021-42979

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions NoMachine Cloud Server versions 4.0.346 through 7.7.4

Description The issue allows local attackers to execute arbitrary code in kernel mode or cause a denial of service, resulting in memory corruption and OS crash, via specially crafted I/O Request Packet. This is due to an Integer Overflow in the IOCTL Handler 0x22001B.

Recommendations For NoMachine Cloud Server versions 4.0.346 through 7.7.4, update to a version outside of this range to resolve the issue. As a temporary workaround, consider restricting access to the IOCTL Handler 0x22001B to minimize the risk of exploitation.

Exploit

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2021-42979

Affected Products

Nomachine Cloud Server

References · 4

• 🔥 https://sentinelone.com/labs/usb-over-ethernet-multiple-privilege-escalation-vulnerabilities-in-aws-and-other-major-cloud-services · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-42979 · Security Note
• https://osv.dev/vulnerability/CVE-2021-42979 · Vendor Advisory
• https://t.me/cibsecurity/33513 · Telegram Post