Siemens Nucleus DNS (Update A)
Security researchers discovered and disclosed 9 vulnerabilities in several DNS implementations, also known as “NAME:WRECK” vulnerabilities. The vulnerability described in this advisory is from this set. The DNS client of of the networking component (Nucleus NET) in Nucleus Real-Time Operating System (RTOS) contains a vulnerability related to the handling of UDP port numbers in DNS requests that could allow an attacker to poison the DNS cache or spoof DNS resolving. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not available.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-27393US | medium5.3OT elevated | — | ||
A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2013.08), Nucleus Source Code (Versions including affected DNS modules). T… | ||||
references
External citations — patches, advisories, analysis.
- SSA-201384: Predictable UDP Port Number Vulnerability (NAME:WRECK) in the DNS Module of Nucleus RTOS - CSAF Versionself
- SSA-201384: Predictable UDP Port Number Vulnerability (NAME:WRECK) in the DNS Module of Nucleus RTOS - PDF Versionself
- SSA-201384: Predictable UDP Port Number Vulnerability (NAME:WRECK) in the DNS Module of Nucleus RTOS - TXT Versionself
- ICS Advisory ICSA-21-103-14 JSONself
- Recommended Practicesexternal
- ICS Advisory ICSA-21-103-14 - Web Versionself
- Recommended Practicesexternal
- Recommended Practicesexternal
remediations (6)
- MitigationNucleus NET
Avoid using DNS client of affected versions
- MitigationNucleus ReadyStart V3
Avoid using DNS client of affected versions
- MitigationNucleus Source Code
Avoid using DNS client of affected versions
- No fix plannedNucleus NET
Currently no remediation is planned
- FixedNucleus ReadyStart V3
Update to V2013.08 or later version
https://support.sw.siemens.com/en-US/product/1009925838/ - FixedNucleus Source Code
Contact customer support to receive patch and update information
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