CVE-2017-7901 Weak cryptography in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400
Attackers can predict TCP sequence numbers to spoof or disrupt connections, causing denial of service on Rockwell Automation PLCs.
- 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-2017-7901?
CVE-2017-7901 is a high-severity 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 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 may allow an attacker to spoof or disrupt TCP connections, resulting in a denial of service for the target device.
Which versions are affected by CVE-2017-7901?
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-2017-7901?
No fix has been published for CVE-2017-7901 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-7901 being exploited?
There is no known exploitation of CVE-2017-7901 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-2017-7902 Weak cryptography 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
Sources
Also known as GHSA-9mhw-mx58-2jch.