Justin C. Klein Keane has discovered a weakness in the Views module for Drupal, which can be exploited by malicious people to disclose potentially sensitive information.
The weakness caused due an error in the "views_ajax_autocomplete_user()" function in modules/views/includes/ajax.inc, which does not properly check for access permissions before querying for usernames. This can be exploited to enumerate valid usernames.
The weakness is confirmed in version 6.x-2.11 and also reported in version 5.x-1.8. Other versions may also be affected.
Solution: Edit the source code to implement proper access restrictions.
Provided and/or discovered by: Justin C. Klein Keane
Original Advisory: http://www.madirish.net/?article=465
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Subject: Drupal Views Module Autocomplete User Information Disclosure Weakness
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