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Siemens Industrial Products SNMP Vulnerabilities (Update A)

Siemens Industrial Products SNMP Vulnerabilities

1. EXECUTIVE SUMMARY

2. UPDATE INFORMATION

This updated advisory is a follow-up to the original advisory titled ICSA-20-042-02 Siemens Industrial Products SNMP Vulnerabilities that was published February 11, 2020, on the ICS webpage on us-cert.gov.

3. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow remote attackers to conduct a denial-of-service attack by sending specially crafted packets to Port 161/UDP (SNMP).

4. TECHNICAL DETAILS

4.1 AFFECTED PRODUCTS

The following Siemens products are affected:

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4.2 VULNERABILITY OVERVIEW

4.2.1    DATA PROCESSING ERRORS CWE-19

An error in the message handling of SNMP messages allows remote attackers to cause a denial-of-service condition and execute arbitrary code via a crafted packet sent on Port 161/UDP (SNMP).

CVE-2015-5621 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

4.2.2    NULL POINTER DEREFERENCE CWE-476

A NULL pointer exception bug within the SMNP handling code allows authenticated attacker to remotely cause a denial-of-service condition via a crafted packet sent on Port 161/UDP (SNMP).

CVE-2018-18065 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

4.3 BACKGROUND

4.4 RESEARCHER

Artem Zinenko of Kaspersky Lab reported these vulnerabilities to Siemens.

5. MITIGATIONS

Siemens has released updates for several affected products and recommends users update to the new version. Siemens is preparing further updates and recommends specific countermeasures until patches are available.

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Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:

As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens’ operational guidelines for Industrial Security, and follow the recommendations in the product manuals.

Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.

No known public exploits specifically target these vulnerabilities.

Source:

https://us-cert.cisa.gov/ics/advisories/icsa-20-042-02

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