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Rewterz Threat Advisory – ICS: Siemens Nucleus Products DNS Module

Severity

High

Analysis Summary

CVE-2020-15795

The names of the DNS responses are not properly validated by the DNS domain name label parsing functionality. The parsing of malformed responses could result in a write past the end of an allocated structure. The vulnerability could result in denial-of-service conditions if an attacker with a privileged position in the network could exploit the vulnerability and execute code in the context of the current process.

CVE-2020-27009

The pointer offset values are not properly validated by the DNS domain name record decompression functionality. The parsing of malformed responses could result in a write past the end of an allocated structure. The vulnerability could result in denial-of-service conditions if an attacker with a privileged position in the network could exploit the vulnerability and execute code in the context of the current process.

Impact

  • Denial-of-service
  • Remote code execution

Affected Vendors

Siemens

Affected Products

  • Nucleus NET: All versions prior to v5.2
  • Nucleus RTOS
  • Nucleus Source Code
  • Nucleus VSTAR

Remediation

Refer to the ICS advisory for the complete list of affected products, mitigation methods, and their respective patches. https://us-cert.cisa.gov/ics/advisories/icsa-21-103-04