An Improper Restriction of Excessive Authentication Attempts issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic controllers 1763-L16AWA, Series A and B, Version 16.00 and prior versions; 1763-L16BBB, Series A and B, Version 16.00 and prior versions; 1763-L16BWA, Series A and B, Version 16.00 and prior versions; and 1763-L16DWD, Series A and B, Version 16.00 and prior versions and Allen-Bradley MicroLogix 1400 programmable logic controllers 1766-L32AWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWAA, Series A and B, Version 16.00 and prior versions; 1766-L32BXB, Series A and B, Version 16.00 and prior versions; 1766-L32BXBA, Series A and B, Version 16.00 and prior versions; and 1766-L32AWAA, Series A and B, Version 16.00 and prior versions. There are no penalties for repeatedly entering incorrect passwords.
The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| 1763-l16awa_series_a | Rockwellautomation | * | 16.000 (including) |
| 1763-l16awa_series_b | Rockwellautomation | * | 16.000 (including) |
| 1763-l16bbb_series_a | Rockwellautomation | * | 16.000 (including) |
| 1763-l16bbb_series_b | Rockwellautomation | * | 16.000 (including) |
| 1763-l16bwa_series_a | Rockwellautomation | * | 16.000 (including) |
| 1763-l16bwa_series_b | Rockwellautomation | * | 16.000 (including) |
| 1763-l16dwd_series_a | Rockwellautomation | * | 16.000 (including) |
| 1763-l16dwd_series_b | Rockwellautomation | * | 16.000 (including) |
Common protection mechanisms include:
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator. [REF-45]