CVE-2017-7924 Denial of service in Rockwell Automation MicroLogix 1100 Controllers
A remote unauthenticated attacker can cause a denial of service on Rockwell Automation MicroLogix 1100 controllers by sending a specially crafted PCCC packet.
- 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-2017-7924?
CVE-2017-7924 is a high-severity denial of service vulnerability in Rockwell Automation MicroLogix 1100 Controllers, published on 20 Sep 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An Improper Input Validation issue was discovered in Rockwell Automation MicroLogix 1100 controllers 1763-L16BWA, 1763-L16AWA, 1763-L16BBB, and 1763-L16DWD. A remote, unauthenticated attacker could send a single, specially crafted Programmable Controller Communication Commands (PCCC) packet to the controller that could potentially cause the controller to enter a DoS condition.
Weakness: CWE-20
Which versions are affected by CVE-2017-7924?
It affects 4 products.
Products include Rockwellautomation 1763-L16awa Firmware, Rockwellautomation 1763-L16bbb Firmware, Rockwellautomation 1763-L16bwa Firmware, Rockwellautomation 1763-L16dwd Firmware.
How do I fix CVE-2017-7924?
No fix has been published for CVE-2017-7924 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-7924 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-7924 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-ch2w-m37v-83fq.