Citrix NetScaler DNS Query Port Entropy Weakness Lets Remote Users Spoof the System
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SecurityTracker Alert ID: 1020558
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SecurityTracker URL: http://securitytracker.com/id?1020558
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CVE Reference: CVE-2008-1447
(Links to External Site)
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Date: Jul 25 2008
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Impact: Modification of system information
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Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 8.x and prior versions
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Description: A vulnerability was reported in Citrix NetScaler. 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.
In addition, if the target device is used for
Network Address Translation (NAT) in front of a separate, caching DNS server, the system is vulnerable.
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: No solution was available at the time of this entry.
The vendor plans to issue a fix for version 8.x on August 4, 2008.
The vendor's advisory is available at:
http://support.citrix.com/article/CTX117991
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Vendor URL: support.citrix.com/article/CTX117991 (Links to External Site)
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Cause: Randomization error
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Message History:
None.
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Source Message Contents
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Date: Fri, 25 Jul 2008 09:07:11 -0400
Subject: Citrix NetScaler
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http://support.citrix.com/article/CTX117991
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