CVE Catalog

CVE-2017-7901

High
Published: Translated: NVD NIST

Summary

A Predictable Value Range from Previous Values issue was discovered in Allen-Bradley MicroLogix 1100 and 1400 programmable logic controllers, related to insufficiently random TCP initial sequence numbers. An attacker may predict these numbers from previous values.

Risk Assessment

Predictable TCP sequence numbers may allow attackers to hijack communication with the device, leading to potential threats to the integrity and availability of the system.

Recommendation

It is recommended to update the controllers' firmware to the latest version to improve the randomness of generated TCP sequence numbers and minimize the risk of attacks.

Related vulnerabilities

Original NVD description (English source)

A Predictable Value Range from Previous Values 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. Insufficiently random TCP initial sequence numbers are generated, which may allow an attacker to predict the numbers from previous values. This

Vulnerability data from NVD (NIST) · CISA KEV · EPSS