(Red Hat Issues Fix) BIND DNS Query Port Entropy Weakness Lets Remote Users Spoof the System
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SecurityTracker Alert ID: 1020445 |
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SecurityTracker URL: http://securitytracker.com/id/1020445
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CVE Reference:
CVE-2008-1447
(Links to External Site)
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Updated: Jul 11 2008
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Original Entry Date: Jul 8 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:
Red Hat has issued a fix.
On July 10, 2008, Red Hat issued revised packages for Red Hat Enterprise Linux 5 because the packages issued on July 8, 2008 contained default and sample caching-nameserver configuration files that specified a fixed query-source port.
The Red Hat advisory is available at:
https://rhn.redhat.com/errata/RHSA-2008-0533.html
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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:
Linux (Red Hat Enterprise)
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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: Tue, 8 Jul 2008 18:04:32 -0400
Subject: Red Hat BIND
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https://rhn.redhat.com/errata/RHSA-2008-0533.html
CVE-2008-1447
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