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Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
(OpenBSD Issues Fix) BIND DNS Query Port Entropy Weakness Lets Remote Users Spoof the System
SecurityTracker Alert ID:  1020543
SecurityTracker URL:  http://securitytracker.com/id/1020543
CVE Reference:   CVE-2008-1447   (Links to External Site)
Date:  Jul 24 2008
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.x
Description:   A vulnerability was reported in BIND. A remote user can spoof the system.

The domain name system (DNS) service does not use sufficiently random UDP sockets to process queries. A remote user can send specially crafted DNS queries and responses to the target service to spoof responses and insert records into the DNS cache. This may cause traffic to be redirected to arbitrary IP addresses specified by the remote user.

The vendor indicates that the vulnerability exists in the DNS protocol itself, rather than in any particular vendor's implementation.

Systems using BIND as a caching resolver are affected.

Some demonstration exploit code is available at:

http://www.caughq.org/exploits/CAU-EX-2008-0002.txt
http://www.caughq.org/exploits/CAU-EX-2008-0003.txt

Dan Kaminsky of IOActive reported this vulnerability.

Impact:   A remote user can spoof the DNS service, causing traffic to be redirected to arbitrary hosts.
Solution:   OpenBSD has issued a fix:

ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.2/common/013_bind.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.3/common/004_bind.patch

Vendor URL:  www.isc.org/index.pl?/sw/bind/index.php (Links to External Site)
Cause:   Randomization error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  4.2, 4.3

Message History:   This archive entry is a follow-up to the message listed below.
Jul 8 2008 BIND DNS Query Port Entropy Weakness Lets Remote Users Spoof the System



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