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Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
(Ubuntu Issues Fix) BIND Recursion Access Control Flaw Lets Remote Users Obtain Potentially Sensitive Information About Previous Nameserver Queries
SecurityTracker Alert ID:  1041121
SecurityTracker URL:  http://securitytracker.com/id/1041121
CVE Reference:   CVE-2018-5738   (Links to External Site)
Date:  Jun 13 2018
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.9.12, 9.10.7, 9.11.3, 9.12.0 - 9.12.1-P2
Description:   A vulnerability was reported in BIND. A remote user can obtain potentially sensitive information on the target system.

A remote user can bypass intended recursion access controls and make a recursive query to a BIND nameserver in certain cases.

When configured with "recursion yes;" and match list values are not provided for "allow-query-cache" or "allow-query", the "allow-recursion" setting may permit all hosts to perform recursion.

As a result, a remote user can examine the results of queries answered from the cache to determine which queries a server has previously responded to.

Releases after change #4777 (from October 2017) are affected.

Andrew Skalski reported this vulnerability.

Impact:   A remote user can obtain potentially sensitive information about queries a server has previously responded to.
Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://usn.ubuntu.com/usn/usn-3683-1

Vendor URL:  usn.ubuntu.com/usn/usn-3683-1 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  18.04 LTS

Message History:   This archive entry is a follow-up to the message listed below.
Jun 13 2018 BIND Recursion Access Control Flaw Lets Remote Users Obtain Potentially Sensitive Information About Previous Nameserver Queries



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