The TLDR version of this post is that some of the defaults for OpenLDAP may not be secure, it is easy to make other configuration mistakes, and you should make sure to examine configurations, permissions, ACLs, and schemas with security in mind. Different distributions can have different defaults. If you are using LDAP for account information in particular, you need to be careful.
I will go over some specifics that I noticed, but I certainly won't cover everything. OpenLDAP can be configured to get a similar level of protection for account information compared to the standard Unix/Linux shadow files and actually makes some security-related tasks easier for an administrator, such as disabling accounts or enforcing password policies.
At Eating Security.
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