Summary
The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for administration, commissioning and updates.
With special crafted requests it is possible to change some special parameters without authentication.
Impact
This vulnerability allows an attacker who has access to the WBM and knowledge about the directory structure from the WBM to change the parameter setting of the devices by sending specifically constructed requests without authentication.
This can lead to malfunction of the application after reboot.
Affected Product(s)
| Model no. | Product name | Affected versions |
|---|---|---|
| 750-362 | 750-362 | Firmware <=FW03 |
| 750-363 | 750-363 | Firmware <=FW03 |
| 750-823 | 750-823 | Firmware <=FW03 |
| 750-832/xxx-xxx | 750-832/xxx-xxx | Firmware <=FW03 |
| 750-862 | 750-862 | Firmware <=FW03 |
| 750-890/0xx-xxx | 750-890/0xx-xxx | Firmware <=FW03 |
| 750-891 | 750-891 | Firmware <=FW03 |
Vulnerabilities
Expand / Collapse allImproper Authentication vulnerability in WAGO 750-8XX series with FW version <= FW03 allows an attacker to change the settings of the devices by sending specifically constructed requests without authentication This issue affects: WAGO 750-362 version FW03 and prior versions. WAGO 750-363 version FW03 and prior versions. WAGO 750-823 version FW03 and prior versions. WAGO 750-832/xxx-xxx version FW03 and prior versions. WAGO 750-862 version FW03 and prior versions. WAGO 750-891 version FW03 and prior versions. WAGO 750-890/xxx-xxx version FW03 and prior versions.
Mitigation
- Restrict network access to the device.
- Do not directly connect the device to the internet.
- Disable unused TCP/UDP ports.
- Disable web-based management ports 80/443 after the configuration phase
Revision History
| Version | Date | Summary |
|---|---|---|
| 1 | 30.09.2020 13:08 | initial revision |
| 2 | 10.04.2025 15:00 | Fixed csaf reference URL |
| 3 | 14.05.2025 15:00 | Fix: added distribution |