Vigil@nce - Samba: altering AD DC LDAP objects
January 2013 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
When Samba is configured as an Active Directory Domain Controller, an authenticated attacker can alter LDAP objects.
Impacted products: Fedora, Samba
Creation date: 15/01/2013
DESCRIPTION OF THE VULNERABILITY
The Samba server can be configured as an Active Directory domain controller. An AD uses LDAP objects to represent resources (users, computers, etc.).
The access control to object is defined by its "objectClass". However, if an user owns a right (such as the read right) on an object, then he automatically gains the write privilege on this object. Moreover, if the user owns the writing right on an attribute of the object, then he gains the writing right on all attributes of the object.
When Samba is configured as an Active Directory Domain Controller, an authenticated attacker can therefore alter LDAP objects.
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