CVE-2018-4838 Missing authorization in EN100 Ethernet module DNP3 variant
Unauthenticated attackers can upgrade or downgrade firmware on Siemens EN100 Ethernet modules via the web interface, potentially installing vulnerable versions.
- 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-2018-4838?
CVE-2018-4838 is a high-severity missing authorization vulnerability in Siemens AG EN100 Ethernet module DNP3 variant, published on 8 Mar 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 EN100 Ethernet module IEC 61850 variant (All versions < V4.30), EN100 Ethernet module DNP3 variant (All versions < V1.04), EN100 Ethernet module PROFINET IO variant (All versions), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module IEC 104 variant (All versions < V1.22). The web interface (TCP/80) of affected devices allows an unauthenticated user to upgrade or downgrade the firmware of the device, including to older versions with known vulnerabilities.
Weakness: CWE-306
Which versions are affected by CVE-2018-4838?
It affects 5 products.
Products include Siemens En100 Ethernet Module Dnp3 Firmware, Siemens En100 Ethernet Module Iec 104 Firmware, Siemens En100 Ethernet Module Iec 61850 Firmware, Siemens En100 Ethernet Module Modbus Tcp Firmware, Siemens En100 Ethernet Module Profinet Io Firmware.
How do I fix CVE-2018-4838?
No fix has been published for CVE-2018-4838 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2018-4838 being exploited?
There is no known exploitation of CVE-2018-4838 in the wild and no public exploit code.
Other vulnerabilities in Siemens AG EN100 Ethernet module DNP3 variant
Sources
Also known as GHSA-r849-hjqv-324f.