CVE-2018-16557 Denial of service in SIMATIC S7-400 CPU 412-1 DP V7

Q: Is CVE-2018-16557 being exploited?

There is no known exploitation of CVE-2018-16557 in the wild and no public exploit code.

Q: How do I fix CVE-2018-16557?

No fix has been published for CVE-2018-16557 yet. Limit exposure of the affected software until one is available.

High 8.2 Published 13 Dec 2018 Updated 5 Aug 2024

Remote attackers can cause denial of service on Siemens SIMATIC S7-400 CPUs by sending crafted packets, requiring firmware re-flashing for recovery.

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-2018-16557?

CVE-2018-16557 is a high-severity denial of service vulnerability in Siemens SIMATIC S7-400 CPU 412-1 DP V7, published on 13 Dec 2018. 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 S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 414F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416-2 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416F-2 DP V7 (All versions), SIMATIC S7-400 CPU 416F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 417-4 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 PN V7 (All versions < V7.0.3), SIMATIC S7-400 H V4.5 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) (All versions < V6.0.9), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-410 CPU family (incl. SIPLUS variants) (All versions < V8.2.1), SIPLUS S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 V7 (All versions), SIPLUS S7-400 CPU 417-4 V7 (All versions). Sending of specially crafted packets to port 102/tcp via Ethernet interface via PROFIBUS or Multi Point Interfaces (MPI) could cause a denial of service condition on affected devices. Flashing with a firmware image may be required to recover the CPU. Successful exploitation requires an attacker to have network access to port 102/tcp via Ethernet interface or to be able to send messages via PROFIBUS or Multi Point Interfaces (MPI) to the device. No user interaction is required. If no access protection is configured, no privileges are required to exploit the security vulnerability. The vulnerability could allow causing a denial of service condition of the core functionality of the CPU, compromising the availability of the system.

Weakness: CWE-347

Which versions are affected by CVE-2018-16557?

It affects 4 products.

Products include Siemens Simatic S7-400 Firmware, Siemens Simatic S7-400 Pn\/Dp V7 Firmware, Siemens Simatic S7-400h Firmware, Siemens Simatic S7-410 Firmware.

How do I fix CVE-2018-16557?

No fix has been published for CVE-2018-16557 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-2018-16557 being exploited?

There is no known exploitation of CVE-2018-16557 in the wild and no public exploit code.

Sources

Also known as GHSA-5wjq-9mm7-ccm8.