QID 590995

Date Published: 2022-08-26

QID 590995: WAGO PFC100/200 Web-Based Management (WBM) FastCGI configuration insufficient resource pool Denial of Service (DoS) Vulnerability (TALOS-2019-0939)

AFFECTED PRODUCTS
WAGO PFC200 Firmware version 03.00.39(12) WAGO PFC200 Firmware version 03.01.07(13) WAGO PFC100 Firmware version 03.00.39(12) WAGO PFC100 Firmware version 03.02.02(14)
Based on inspection of various firmware versions, this vulnerability appears to impact all versions from the current and going back to at least 10 and likely earlier.

QID Detection Logic (Authenticated):
QID checks for the Vulnerable version of using passive scanning

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.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution

    Customers are advised to refer to CERT MITIGATIONS section TALOS-2019-0939 for affected packages and patching details.

    Vendor References

    CVEs related to QID 590995

    CVE-2019-5149 |
    Software Advisories
    Advisory ID Software Component Link
    TALOS-2019-0939 URL Logo talosintelligence.com/vulnerability_reports/TALOS-2019-0939
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