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Category:   Device (Encryption/VPN)  >   Citrix NetScaler Vendors:   Citrix
Citrix NetScaler DNS Query Port Entropy Weakness Lets Remote Users Spoof the System
SecurityTracker Alert ID:  1020558
SecurityTracker URL:  http://securitytracker.com/id/1020558
CVE Reference:   CVE-2008-1447   (Links to External Site)
Date:  Jul 25 2008
Impact:   Modification of system information
Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 8.x and prior versions
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.

Impact:   A remote user can spoof the DNS service, causing traffic to be redirected to arbitrary hosts.
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

Vendor URL:  support.citrix.com/article/CTX117991 (Links to External Site)
Cause:   Randomization error

Message History:   None.


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