(OpenBSD Issues Fix) BIND DNS Query Port Entropy Weakness Lets Remote Users Spoof the System
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SecurityTracker Alert ID: 1020543 |
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SecurityTracker URL: http://securitytracker.com/id/1020543
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CVE Reference:
CVE-2008-1447
(Links to External Site)
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Date: Jul 24 2008
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Impact:
Modification of system information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 9.x
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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.
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Impact:
A remote user can spoof the DNS service, causing traffic to be redirected to arbitrary hosts.
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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
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Vendor URL: www.isc.org/index.pl?/sw/bind/index.php (Links to External Site)
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Cause:
Randomization error
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Underlying OS:
UNIX (OpenBSD)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 24 Jul 2008 08:34:01 -0400
Subject: OpenBSD
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http://www.openbsd.org/errata42.html
http://www.openbsd.org/errata43.html
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
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