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Cisco Bug: CSCun36631 - EHN: URL Defang operation should account for DNS Spoofing

Last Modified

Nov 27, 2020

Products (1)

  • Cisco IronPort Email Security Appliance Software

Known Affected Releases

8.5.0-beta1-415

Description (partial)

Symptom:
Links from some sites are able to be followed even though they were supposed to have been defanged.

Conditions:
- The domain owner has taken steps to ensure that typos in the URL before the domain name are accounted for (a valid DNS response to a URL similar to blockedwww.eharmony.com).
- The URL ends with a slash character (/) such that the "BLOCKED" that is added to the end is added after the trailing slash (/).
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Bug Details Include

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