Missing SPF for hackerone.com

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Hackerone #120
Target: Hackerone
Target Module:
Type: Best Practice
Original: Link
Archive Screenshot

No SPF/TXT records existed for the domain hackerone.com. This means the emails could be sent from any source claiming to be from the domain hackerone.com.

How To Perform

  1. Check a domain's SPF records using tools like
    1. http://www.kitterman.com/spf/validate.html
    2. https://mxtoolbox.com/spf.aspx
    3. Try googling "check spf records"
  2. If no records are found then this domain is vulnerable.


Hackerone's current SPF record is this

v=spf1 include:_spf.google.com include:amazonses.com include:mail.zendesk.com include:spf.mail.intercom.io include:mktomail.com include:_spf.salesforce.com -all 

The SPF record gives instruction to the email receiver about what to do with an email that failed to meet the parameters via the suffix:

  1. +all = pass = email will be accepted
  2.  ?all = neutral = email will be accepted
  3. ~all = soft fail = will be accepted, but marked as potential spam
  4. -all = fail = will be rejected

Anonymous user #1

6 months ago
Score 0+
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