Siemens EN100 Ethernet Module Security Vulnerability Crafted Packet resource management

Summaryinfo

A vulnerability marked as problematic has been reported in Siemens EN100 Ethernet Module. This impacts an unknown function of the component Security Vulnerability. Performing a manipulation as part of Crafted Packet results in resource management. This vulnerability is reported as CVE-2018-16563. The attack is possible to be carried out remotely. No exploit exists. It is suggested to use restrictive firewalling.

Detailsinfo

A vulnerability classified as problematic has been found in Siemens EN100 Ethernet Module (the affected version is unknown). This affects an unknown code of the component Security Vulnerability. The manipulation as part of a Crafted Packet leads to a resource management vulnerability. CWE is classifying the issue as CWE-399. This is going to have an impact on availability. The summary by CVE is:

A vulnerability has been identified in Firmware variant IEC 61850 for EN100 Ethernet module (All versions < V4.35), Firmware variant MODBUS TCP for EN100 Ethernet module (All versions), Firmware variant DNP3 TCP for EN100 Ethernet module (All versions), Firmware variant IEC104 for EN100 Ethernet module (All versions), Firmware variant Profinet IO for EN100 Ethernet module (All versions), SIPROTEC 5 relays with CPU variants CP300 and CP100 and the respective Ethernet communication modules (All versions < V7.82), SIPROTEC 5 relays with CPU variants CP200 and the respective Ethernet communication modules (All versions < V7.58). Specially crafted packets to port 102/tcp could cause a denial-of-service condition in the affected products. A manual restart is required to recover the EN100 module functionality of the affected devices. Successful exploitation requires an attacker with network access to send multiple packets to the affected products or modules. As a precondition the IEC 61850-MMS communication needs to be activated on the affected products or modules. No user interaction or privileges are required to exploit the vulnerability. The vulnerability could allow causing a Denial-of-Service condition of the network functionality of the device, compromising the availability of the system. At the time of advisory publication no public exploitation of this security vulnerability was known.

The bug was discovered 02/12/2019. The weakness was disclosed 03/21/2019 (Website). The advisory is shared at cert-portal.siemens.com. This vulnerability is uniquely identified as CVE-2018-16563 since 09/06/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 37 days. During that time the estimated underground price was around $5k-$25k.

It is possible to mitigate the weakness by firewalling tcp/102.

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Productinfo

Vendor

• Siemens

Name

• EN100 Ethernet Module

License

• commercial

Website

• Vendor: https://www.siemens.com/

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