CVE-2019-5149 Denial of service in WAGO PFC100 Firmware
An attacker can cause a denial of service on WAGO PFC controllers by exhausting limited FastCGI processes in the default web server configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-5149?
CVE-2019-5149 is a high-severity denial of service vulnerability in WAGO PFC100 Firmware, published on 10 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The WBM web application on firmwares prior to 03.02.02 and 03.01.07 on the WAGO PFC100 and PFC2000, respectively, runs on a lighttpd web server and makes use of the FastCGI module, which is intended to provide high performance for all Internet applications without the penalties of Web server APIs. However, the default configuration of this module appears to limit the number of concurrent php-cgi processes to two, which can be abused to cause a denial of service of the entire web server. This affects WAGO PFC200 Firmware version 03.00.39(12) and version 03.01.07(13), and WAGO PFC100 Firmware version 03.00.39(12) and version 03.02.02(14).
Weakness: CWE-400
Which versions are affected by CVE-2019-5149?
It affects 2 products.
Products include Wago Pfc100 Firmware, Wago Pfc200 Firmware.
How do I fix CVE-2019-5149?
No fix has been published for CVE-2019-5149 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-5149 being exploited?
There is no known exploitation of CVE-2019-5149 in the wild and no public exploit code.
Other vulnerabilities in WAGO PFC100 Firmware
Sources
Also known as GHSA-g23p-pfjq-33rc.