PT-2018-23: Remote Code Execution in PRTG Network Monitor

Vulnerable software

PRTG Network Monitor
Version: 18.3.43.2323 and earlier

Link:
https://www.paessler.com/prtg

Severity level

Severity level: High
Impact: Remote Code Execution
Access Vector: Remote

CVSS v3:
Base Score: 9.1
Vector: (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)

CVE: no assigned

Vulnerability description

The specialists of the Positive Research center have detected a Remote Code Execution vulnerability in PRTG Network Monitor.

Vulnerability due to improper handling of user input in the POST parameter 'proxyport_' allows remote authenticated attackers with read-write privileges to execute an arbitrary code and OS commands with system privileges. Using a specially crafted HTTP request an attacker can override the 'writeresult' command-line parameter for the HttpAdvancedSensor.exe executable file and write arbitrary data to an arbitrary file-system location, as demonstrated by creating an executable file in the \Custom Sensors\EXE directory and executing it through creation of EXE/Script Sensor.

How to fix

Update your software up to the latest version

Advisory status

25.05.2018 - Vendor gets vulnerability details
24.09.2018 - Vendor releases fixed version and details
25.10.2018 - Public disclosure

Credits

The vulnerability was detected by Anton Vaychikauskas, Dmitry Galecha, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2018-23
https://www.paessler.com/prtg/history/stable#18.3.44.2054

Reports on the vulnerabilities previously discovered by Positive Research:

https://www.ptsecurity.com/
https://en.securitylab.ru/lab/

About Positive Technologies

Positive Technologies is a leading provider of vulnerability assessment, compliance management and threat analysis solutions to more than 1,000 global enterprise clients. Our solutions work seamlessly across your entire business: securing applications in development; assessing your network and application vulnerabilities; assuring compliance with regulatory requirements; and blocking real-time attacks. Our commitment to clients and research has earned Positive Technologies a reputation as one of the foremost authorities on SCADA, Banking, Telecom, Web Application and ERP security, and distinction as the #1 fastest growing Security and Vulnerability Management firm in 2012, as shown in an IDC report*. To learn more about Positive Technologies please visit www.ptsecurity.com

*Source: IDC Worldwide Security and Vulnerability Management 2013-2017 Forecast and 2012 Vendor Shares, doc #242465, August 2013. Based on year-over-year revenue growth in 2012 for vendors with revenues of $20M+

Threatscape