Summary
The reported vulnerabilities allow a remote attacker to change the setting, delete the application, set the device to factory defaults, code execution and to cause a system crash or denial of service.
Note(s)
The following products are affected by the listed vulnerabilities:
Series PFC100 (750-81xx/xxx-xxx)
Series PFC200 (750-82xx/xxx-xxx)
The following products are affected by the vulnerability CVE-2019-5078
750-852, 750-831/xxx-xxx, 750-881, 750-880/xxx-xxx, 750-889
750-823, 750-832/xxx-xxx, 750-862, 750-890/xxx-xxx, 750-891
Impact
These vulnerabilities allow an attacker to manipulate the settings or disturb the basic function of the device via specially crafted IP packets. This can be potentially used to get control of the device.
Affected Product(s)
| Model no. | Product name | Affected versions |
|---|---|---|
| 750-81xx/xxx-xxx (PFC100) | Firmware <FW15 | |
| 750-823 | Firmware <FW15 | |
| 750-82xx/xxx-xxx (PFC200) | Firmware <FW15 | |
| 750-831/xxx-xxx | Firmware <FW15 | |
| 750-832/xxx-xxx | Firmware <FW15 | |
| 750-852 | Firmware <FW15 | |
| 750-880/xxx-xxx | Firmware <FW15 | |
| 750-881 | Firmware <FW15 | |
| 750-889 | Firmware <FW15 | |
| 750-890/xxx-xxx | Firmware <FW15 | |
| 750-891 | Firmware <FW15 | |
| 750-891 | Firmware <FW15 |
Vulnerabilities
Expand / Collapse allAn exploitable stack buffer overflow vulnerability exists in the iocheckd service ''I/O-Check'' functionality of WAGO PFC200 Firmware version 03.01.07(13), WAGO PFC200 Firmware version 03.00.39(12) and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a stack buffer overflow, resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.
An exploitable stack buffer overflow vulnerability exists in the command line utility getcouplerdetails of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets sent to the iocheckd service "I/O-Check" can cause a stack buffer overflow in the sub-process getcouplerdetails, resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.
An exploitable heap buffer overflow vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a heap buffer overflow, potentially resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.
An exploitable heap buffer overflow vulnerability exists in the iocheckd service ''I/O-Chec'' functionality of WAGO PFC 200 Firmware version 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a heap buffer overflow, potentially resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.
An exploitable heap buffer overflow vulnerability exists in the iocheckd service I/O-Check functionality of WAGO PFC200 Firmware version 03.01.07(13), WAGO PFC200 Firmware version 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a heap buffer overflow, potentially resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.
An exploitable denial of service vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a denial of service, resulting in the device entering an error state where it ceases all network communications. An attacker can send unauthenticated packets to trigger this vulnerability.
An exploitable information exposure vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause an external tool to fail, resulting in uninitialized stack data to be copied to the response packet buffer. An attacker can send unauthenticated packets to trigger this vulnerability.
Mitigation
Restrict network access to the device.
Do not directly connect the device to the internet.
Disable unused TCP/UDP-ports
Remediation
The I/O-Check service protocol is only needed during installation and commissioning, not during normal operations. It is highly recommended to disable the IP-port 6626 after commissioning. This is the easiest and securest way to protect your device for the listed vulnerabilities and for upcoming zero day exploits.
Regardless of the action described above, the following CVEs can be fixed alternatively by a firmware update >= FW 15.
CVE-2019-5073
CVE-2019-5074
CVE-2019-5075
CVE-2019-5079
CVE-2019-5081
CVE-2019-5082
Revision History
| Version | Date | Summary |
|---|---|---|
| 1 | 12/16/2019 10:00 | Initial revision. |