Siemens SIMATIC CP 1543-1 Improper Privilege Management Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-03

[ Description ]Official description

A vulnerability has been identified in SIMATIC CP 1543-1 (All versions < V2.0.28), SIPLUS NET CP 1543-1 (All versions < V2.0.28). Under special conditions it was possible to write SNMP variables on port 161/udp which should be read-only and should only be configured with TIA-Portal. A write to these variables could reduce the availability or cause a denial-of-service.

CISA: An improper privilege management vulnerability exists within the Siemens SIMATIC Communication Processor (CP) that allows a privileged attacker to remotely cause a denial of service.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 24 Mar 2022): Apply updates per vendor instructions.

• Patch on siemens.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• www.securityfocus.com/bid/94436Broken LinkThird Party AdvisoryVDB Entry
• www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-672373.pdfBroken LinkPatchVendor Advisory
• cert-portal.siemens.com/productcert/pdf/ssa-672373.pdfVendor Advisory
• ics-cert.us-cert.gov/advisories/ICSA-16-327-01Third Party AdvisoryUS Government Resource
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource