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I'm just setting up a new openLDAP server for user authentification and stumbled over the access control statements in the serverguide. In especially:

access to * by self write ...

As the access to the "uidNumber" attribute isn't prohibited by a previous statement, this allows any user with an LDAP account to change their "uidNumber" to 0 (root) and login using their default credentials and become root (or someone else). At least this is possible on my setup, with this ACLs.

Am I missing something?

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closed as off topic by Jorge Castro, Mitch, Amith KK, Anwar Shah, con-f-use Oct 16 '12 at 12:20

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This is an excellent question ...but since Ask Ubuntu is not the place for bug reports, if it turns out that this is a security hole, then you should report it as a security bug in Ubuntu (against the server guide itself, not against LDAP). –  Eliah Kagan Jun 17 '12 at 2:13

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