CVE-2017-7902 Weak cryptography in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
Attackers can capture and replay valid requests due to nonce reuse in Rockwell Automation PLCs, bypassing authentication or integrity checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-7902?
CVE-2017-7902 is a critical vulnerability in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400, published on 30 Jun 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2017-7902?
It affects 20 products.
Products include Rockwellautomation 1763-L16awa Series A, Rockwellautomation 1763-L16awa Series B, Rockwellautomation 1763-L16bbb Series A, Rockwellautomation 1763-L16bbb Series B, Rockwellautomation 1763-L16bwa Series A, Rockwellautomation 1763-L16bwa Series B and 14 more.
How do I fix CVE-2017-7902?
No fix has been published for CVE-2017-7902 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-7902 being exploited?
There is no known exploitation of CVE-2017-7902 in the wild and no public exploit code.
Other vulnerabilities in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
- CVE-2017-7898 Auth bypass in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
- CVE-2017-7899 Information disclosure in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
- CVE-2017-7903 Weak cryptography in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
- CVE-2016-0868 Memory corruption in n/a
- CVE-2017-7901 Weak cryptography in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
Sources
Also known as GHSA-r727-5v4m-6fx7.