Citrix Access Gateway DNS Query Port Entropy Weakness Lets Remote Users Spoof the System
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SecurityTracker Alert ID: 1020804
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SecurityTracker URL: http://securitytracker.com/id?1020804
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CVE Reference: CVE-2008-1447
(Links to External Site)
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Date: Sep 3 2008
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Impact: Modification of system information
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 4.5.7 Rev A and prior versions
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Description: A vulnerability was reported in Citrix Access Gateway. 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.
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: The vendor has issued a fix (4.5.7 Rev B), available at:
http://support.citrix.com/article/CTX116762
The vendor's advisory is available at:
http://support.citrix.com/article/CTX118183
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Vendor URL: support.citrix.com/article/CTX118183 (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: Wed, 3 Sep 2008 00:39:33 -0400
Subject: Citrix Access Gateway
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http://support.citrix.com/article/CTX118183
> Vulnerability in Access Gateway Standard and Advanced Edition Appliance firmware could result in
DNS Cache Poisoning
CVE-2008-1447
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