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Category:   Device (Embedded Server/Appliance)  >   Citrix Access Gateway Vendors:   Citrix
Citrix Access Gateway DNS Query Port Entropy Weakness Lets Remote Users Spoof the System
SecurityTracker Alert ID:  1020804
SecurityTracker URL:
CVE Reference:   CVE-2008-1447   (Links to External Site)
Date:  Sep 3 2008
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 4.5.7 Rev A and prior versions
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:

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:   The vendor has issued a fix (4.5.7 Rev B), available at:

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Randomization error
Underlying OS:  

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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