An unauthenticated specially crafted packet sent by an attacker over the network will cause a denial-of-service (DoS) vulnerability. Vulnerability allows attacker to stop the PLC. After stopping (ERR LED flashing red), physical access to the PLC is required in order to restart the application. This issue affects: ABB AC500 V2 products with onboard Ethernet version 2.8.4 and prior versions.
Weakness
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ac500_cpu_firmware | Abb | * | 2.8.5 (excluding) |
Potential Mitigations
References
- https://search.abb.com/library/Download.aspx?DocumentID=3ADR010667\u0026LanguageCode=en\u0026DocumentPartId=\u0026Action=Launch
- https://search.abb.com/library/Download.aspx?DocumentID=3ADR010667\u0026LanguageCode=en\u0026DocumentPartId=\u0026Action=Launch