CVE-2018-4839 Weak cryptography in DIGSI 4

Q: Is CVE-2018-4839 being exploited?

There is no known exploitation of CVE-2018-4839 in the wild and no public exploit code.

Q: How do I fix CVE-2018-4839?

No fix has been published for CVE-2018-4839 yet. Limit exposure of the affected software until one is available.

Medium 5.3 Published 8 Mar 2018 Updated 5 Aug 2024

Attackers with local access or privileged network position can reconstruct access authorization passwords due to weak cryptography in Siemens SIPROTEC relays.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-4839?

CVE-2018-4839 is a medium-severity vulnerability in Siemens DIGSI 4, published on 8 Mar 2018. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability has been identified in DIGSI 4 (All versions < V4.92), EN100 Ethernet module DNP3 variant (All versions < V1.05.00), EN100 Ethernet module IEC 104 variant (All versions), EN100 Ethernet module IEC 61850 variant (All versions < V4.30), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module PROFINET IO variant (All versions), Other SIPROTEC 4 relays (All versions), Other SIPROTEC Compact relays (All versions), SIPROTEC 4 7SD80 (All versions < V4.70), SIPROTEC 4 7SJ61 (All versions < V4.96), SIPROTEC 4 7SJ62 (All versions < V4.96), SIPROTEC 4 7SJ64 (All versions < V4.96), SIPROTEC 4 7SJ66 (All versions < V4.30), SIPROTEC Compact 7SJ80 (All versions < V4.77), SIPROTEC Compact 7SK80 (All versions < V4.77). An attacker with local access to the engineering system or in a privileged network position and able to obtain certain network traffic could possibly reconstruct access authorization passwords.

Weakness: CWE-326

Which versions are affected by CVE-2018-4839?

It affects 9 products.

Products include Siemens Digsi 4, 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 and 3 more.

How do I fix CVE-2018-4839?

No fix has been published for CVE-2018-4839 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-4839 being exploited?

There is no known exploitation of CVE-2018-4839 in the wild and no public exploit code.

Sources

Also known as GHSA-qm8x-gp66-4vfh.