VDB-127787 · CVE-2018-20029 · Qualys 371373

NoMachine up to 6.4.5 on Windows 10 DokanFS nxfs.sys memory corruption

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3$0-$5k0.00

A vulnerability was found in NoMachine up to 6.4.5 on Windows 10 and classified as problematic. This issue affects some unknown functionality in the library nxfs.sys of the component DokanFS. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is availability. The summary by CVE is:

The nxfs.sys driver in the DokanFS library 0.6.0 in NoMachine before 6.4.6 on Windows 10 allows local users to cause a denial of service (BSOD) because uninitialized memory can be read.

The bug was discovered 12/07/2018. The weakness was disclosed 12/10/2018 (Website). It is possible to read the advisory at nomachine.com. The identification of this vulnerability is CVE-2018-20029 since 12/10/2018. Attacking locally is a requirement. A simple authentication is required for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371373 (Nomachine nxfs.sys Driver Denial of Service Vulnerability (TR11P08975)).

Upgrading to version 6.4.6 eliminates this vulnerability.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: NoMachine 6.4.6

Timelineinfo

12/07/2018 🔍
12/10/2018 +3 days 🔍
12/10/2018 +0 days 🔍
12/10/2018 +0 days 🔍
12/11/2018 +1 days 🔍
04/19/2020 +495 days 🔍

Sourcesinfo

Advisory: nomachine.com
Status: Not defined

CVE: CVE-2018-20029 (🔍)

Entryinfo

Created: 12/11/2018 07:53
Updated: 04/19/2020 16:09
Changes: 12/11/2018 07:53 (61), 04/19/2020 16:09 (1)
Complete: 🔍

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