Guidance

MailChimp security review

Created:  11 Jun 2018
Updated:  11 Jun 2018
MailChimp logo
A security review of MailChimp, the email service provider, based on the NCSC's SaaS security principles.

MailChimp is an email service provider which allows users to send automated messages, marketing emails and targeted campaigns. 

 

How MailChimp performs against the SaaS Principles

Question

Answer

Detail

Does the SaaS provider protect external data in transit using TLS?

Yes

MailChimp uses TLS 1.2 but only specifies SSL within their documentation.

Does the SaaS provider protect external data in transit using correctly configured certificates?

Yes

MailChimp meets the recommended cryptographic profiles for TLS as published by the NCSC. In addition, MailChimp currently gets an 'A' rating from Qualys SSL Labs (Intermediate Certificate uses SHA1). Note that this was performed on their top level domain, and not all subdomains that may be used for API calls.

Does the SaaS provider protect internal data in transit between services using encryption?

Yes

MailChimp specifies that SSL is supported throughout the entire application and that sensitive data is transmitted via SSL.

Does the SaaS provider protect internal data in transit between services using correctly configured certificates? 

Unknown

At this time, it is unknown whether MailChimp protects external data in transit using correctly configured certificates.

If APIs are available, does the SaaS provider protect both internal and external APIs through an authentication method?

Partial

All API requests made to MailChimp support authentication using HTTP Basic Authentication and OAuth2. However, this is not enforced.

If there is a concept of privilege levels in the service, does the SaaS provider have the ability for low privilege users to be created?

Yes 

MailChimp has a number of different roles available.
If there is a concept of privilege levels, does the SaaS provider provide 2FA/multi-factor authentication on at least the high privileged accounts?

Yes

MailChimp currently provides multi-factor authentication via SMS or a specified app. Multi-factor authentication is not mandatory however, to encourage users MailChimp offers a discount to paying customers.

Does the SaaS provider collect logs of events?

Types of log may include security logs and resource logs

Unknown

MailChimp does not comment about any detailed logging. However, notifications can be enabled for specific events.
Does the provider make logs available to the client?

Unknown

At this time, it is unknown whether MailChimp provide logs to the client.

Does the SaaS provider have a clear incident response and patching system in place to remedy any publicly reported issues in their service, or libraries that the service makes use of?

The provider’s previous track record on this is a good metric to see how they’ll cope with a new issue occurring.

Unknown

 

At this time, it is unknown whether MailChimp has a clear incident response and patching system in place.
Does the SaaS provider give clear and transparent details on their product and the implemented security features (i.e. how easy has it been to answer the above questions) ? Partial From MailChimp's security page: "From time to time, companies ask us security questions about MailChimp. In general, we don't like to expose much information about our security practices, because it only helps the very people we're securing ourselves against.” However some information is made available but not in detail. As we have mentioned in the past we would like to see vendors being as transparent as possible when it comes to their security.

 

Exporting data

MailChimp allows an administrator or owner to backup and export the entire account once every 24 hours.

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