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Detection & Defense · cloudsek.com

CloudSEK Finds SPF Misconfiguration That Could Enable Vendor Email Spoofing

· Original article ↗

Summary

CloudSEK found a logistics SaaS vendor’s SPF record set to soft fail, potentially allowing unauthorized emails to be delivered as if they came from the vendor. It recommends stricter SPF, DKIM, and DMARC controls.

Key points

  • CloudSEK’s SVigil platform identified a vendor domain using SPF’s ~all soft-fail setting.
  • The article says soft fail may allow email from unauthorized servers to reach recipients, enabling impersonation.
  • Potential abuse described includes phishing, business email compromise, fraudulent invoices, and malicious attachments; the article does not report that these attacks occurred.
  • CloudSEK recommends changing SPF to -all, deploying DKIM, and enforcing DMARC with quarantine or reject policies.
  • It also recommends reviewing DMARC reports to identify unauthorized email sources.

Article Details

Defense Focus
Detect and reduce email spoofing risk caused by a vendor domain's permissive SPF policy.
Detection Methods
  • Monitor vendor and third-party domains for misconfigured SPF records.
  • Review DMARC reports for unauthorized email sources and spoofing attempts.
Data Sources
  • DNS SPF records
  • DMARC reports
Rule Types
  • SPF policy configuration
  • DKIM email signing
  • DMARC policy configuration and reporting
Platforms
  • SVigil
Defensive Actions
  • Change the SPF policy from ~all to -all to reject unauthorized senders.
  • Deploy DKIM to authenticate outgoing email and help prevent tampering.
  • Enforce DMARC with p=reject or p=quarantine; configure rua and ruf reporting tags.
  • Regularly review DMARC reports to identify and address unauthorized email sources.

Vendors

CloudSEKDuring a routine supply chain security assessment, CloudSEK’s Digital Supply Chain Security platform SVigil uncovered a misconfigured SPF (Sender Policy Framework) record on a vendor’s primary domain. The vendor, a

Products

SVigilDuring a routine supply chain security assessment, CloudSEK’s Digital Supply Chain Security platform SVigil uncovered a misconfigured SPF (Sender Policy Framework) record on a vendor’s primary domain. The vendor, a

Industries

E-commerceprimary domain. The vendor, a logistics SaaS provider, powers global supply chain operations—serving e-commerce platforms, manufacturers, and enterprises by acting as the digital bridge between suppliers,logisticsa misconfigured SPF (Sender Policy Framework) record on a vendor’s primary domain. The vendor, a logistics SaaS provider, powers global supply chain operations—serving e-commerce platforms, manufacturers, andManufacturing