Vulnerabilities > CVE-2018-6947 - Improper Initialization vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
An uninitialised stack variable in the nxfuse component that is part of the Open Source DokanFS library shipped with NoMachine 6.0.66_2 and earlier allows a local low privileged user to gain elevation of privileges on Windows 7 (32 and 64bit), and denial of service for Windows 8 and 10.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
- Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
Exploit-Db
description NoMachine x64 < 6.0.80 - 'nxfuse' Privilege Escalation. CVE-2018-6947. Local exploit for Windows_x86-64 platform. Tags: Local file exploits/windows_x86-64/local/44168.py id EDB-ID:44168 last seen 2018-02-22 modified 2018-02-22 platform windows_x86-64 port published 2018-02-22 reporter Exploit-DB source https://www.exploit-db.com/download/44168/ title NoMachine x64 < 6.0.80 - 'nxfuse' Privilege Escalation type local description NoMachine x86 < 6.0.80 - 'nxfuse' Privilege Escalation. CVE-2018-6947. Local exploit for Windows_x86 platform. Tags: Local file exploits/windows_x86/local/44167.c id EDB-ID:44167 last seen 2018-02-22 modified 2018-02-22 platform windows_x86 port published 2018-02-22 reporter Exploit-DB source https://www.exploit-db.com/download/44167/ title NoMachine x86 < 6.0.80 - 'nxfuse' Privilege Escalation type local
Packetstorm
data source | https://packetstormsecurity.com/files/download/146544/nomachine-escalate.txt |
id | PACKETSTORM:146544 |
last seen | 2018-02-24 |
published | 2018-02-23 |
reporter | Fidus InfoSecurity |
source | https://packetstormsecurity.com/files/146544/NoMachine-nxfuse-Privilege-Escalation.html |
title | NoMachine nxfuse Privilege Escalation |
References
- https://www.exploit-db.com/exploits/44167/
- https://www.exploit-db.com/exploits/44167/
- https://www.exploit-db.com/exploits/44168/
- https://www.exploit-db.com/exploits/44168/
- https://www.fidusinfosec.com/nomachine-road-code-execution-without-fuzzing-cve-2018-6947/
- https://www.fidusinfosec.com/nomachine-road-code-execution-without-fuzzing-cve-2018-6947/
- https://www.nomachine.com/SU02P00194
- https://www.nomachine.com/SU02P00194
- https://www.nomachine.com/SU02P00195
- https://www.nomachine.com/SU02P00195
- https://www.nomachine.com/TR02P08408
- https://www.nomachine.com/TR02P08408