CVE-2017-7902: rockwellautomation 1763-l16awa_series_a Reusing a Nonce, Key Pair in Encryption

Vulnerability summary

CVE-2017-7902 is a critical (CVSS 9.8) Reusing a Nonce, Key Pair in Encryption vulnerability in rockwellautomation 1763-l16awa_series_a. EPSS estimates a 2.56% chance of exploitation in the next 30 days, higher than 84.9% of scored vulnerabilities.

Timeline

1. 30-06-2017
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

A "Reusing a Nonce, Key Pair in Encryption" 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. The affected product reuses nonces, which may allow an attacker to capture and replay a valid request until the nonce is changed.

• CWE-323Reusing a Nonce, Key Pair in EncryptionNonces should be used for the present occasion and only once.
• CWE-330Use of Insufficiently Random ValuesThe product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.