Successful exploitation of this vulnerability could allow an unauthenticated, remote attacker to overflow a buffer and fully compromise the device.
The following devices using HiOS Version 07.0.02 and lower are affected:
The following devices using HiSecOS Version 03.2.00 and lower are affected:
The vulnerability is due to improper parsing of URL arguments. An attacker could exploit this vulnerability by specially crafting HTTP requests to overflow an internal buffer.
Sebastian Krause and Toralf Gimpel of GAI NetConsult GmbH reported this vulnerability to Hirschmann.
Hirschmann recommends updating HiOS products to Version 07.0.03 or higher and HiSecOS products to Version 03.3.00 or higher.
Hirschmann also recommends, as a workaround, users either use the “IP Access Restriction” feature to restrict HTTP and HTTPS to trusted IP addresses, or disable the HTTP and HTTPS server.
For more information regarding this vulnerability and the associated mitigations, please see Belden security bulletin number BSECV-2020-01.
For additional resources, please go to <https://www.belden.com/security>.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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 this vulnerability.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://www.us-cert.gov/ics
or incident reporting: https://www.us-cert.gov/report
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