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Category:   Application (Directory)  >   OpenLDAP Vendors:
OpenLDAP 'selfwrite' Access Control Error May Let Remote Authenticated Users Make Unauthorized Attribute Modifications
SecurityTracker Alert ID:  1016783
SecurityTracker URL:
CVE Reference:   CVE-2006-4600   (Links to External Site)
Updated:  Jun 8 2008
Original Entry Date:  Sep 4 2006
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 2.3.25
Description:   A vulnerability was reported in OpenLDAP. A remote authenticated user may be able to make unauthorized modifications.

The software does not properly enforce the 'selfwrite' access control parameter. A remote authenticated user with 'selfwrite' privileges as specified in an access control list may be able to make unauthorized modifications to the specified attributes.

Howard Chu reported this vulnerability in June 2006.

The original bug report is available at:

Impact:   A remote authenticated user may be able to make unauthorized attribute modifications.
Solution:   The vendor has issued a fixed version (2.3.25), available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

Date:  Mon, 4 Sep 2006 13:13:43 -0400
Subject:  OpenLDAP vulnerability

> An ACL of the form
  access to dn.subtree="ou=groups,dc=example,dc=com" attr=member by * selfwrite
> is intended to only allow users to add/delete their own DN to the target
> attribute. Currently it allows any DNs to be modified.

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