CVE-2019-18336 Denial of service in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)
Unauthenticated remote attackers can cause Siemens industrial controllers to enter defect mode via crafted Profinet packets, requiring a restart to recover.
- 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-2019-18336?
CVE-2019-18336 is a high-severity denial of service vulnerability in Siemens AG SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants), published on 10 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions < V3.X.17), SIMATIC TDC CP51M1 (All versions < V1.1.8), SIMATIC TDC CPU555 (All versions < V1.1.1), SINUMERIK 840D sl (All versions < V4.8.6), SINUMERIK 840D sl (All versions < V4.94). Specially crafted packets sent to port 102/tcp (Profinet) could cause the affected device to go into defect mode. A restart is required in order to recover the system. Successful exploitation requires an attacker to have network access to port 102/tcp, with no authentication. No user interation is required. At the time of advisory publication no public exploitation of this security vulnerability was known.
Weakness: CWE-400
Which versions are affected by CVE-2019-18336?
It affects 12 products.
Products include Siemens Simatic S7-300 Cpu 312 Ifm Firmware, Siemens Simatic S7-300 Cpu 313 Firmware, Siemens Simatic S7-300 Cpu 314 Firmware, Siemens Simatic S7-300 Cpu 314 Ifm Firmware, Siemens Simatic S7-300 Cpu 315-2 Dp Firmware, Siemens Simatic S7-300 Cpu 315 Firmware and 6 more.
How do I fix CVE-2019-18336?
No fix has been published for CVE-2019-18336 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-2019-18336 being exploited?
There is no known exploitation of CVE-2019-18336 in the wild and no public exploit code.
Sources
Also known as GHSA-q53p-vg4g-3rxp.