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TITLE:
Citrix NetScaler DNS Cache Poisoning

SECUNIA ADVISORY ID:
SA31221

VERIFY ADVISORY:
http://secunia.com/advisories/31221/

CRITICAL:
Moderately critical

IMPACT:
Spoofing

WHERE:
>From remote

OPERATING SYSTEM:
Citrix Netscaler 8.x
http://secunia.com/product/16308/

DESCRIPTION:
Citrix has acknowledged a vulnerability in NetScaler, which can be
exploited by malicious people to poison the DNS cache.

The vulnerability is caused due to NetScaler not sufficiently
randomising the DNS query port number, which can be exploited to
poison the DNS cache.

The vulnerability is reported in NetScaler up to and including
version 8.1 build 57.3 when recursive DNS caching is activated or the
product is running as NAT device in front of a caching DNS server.

SOLUTION:
A fixed version is planned to be released on August, 4th.

http://www.citrix.com/English/ss/downloads/results.asp?productID=21679

PROVIDED AND/OR DISCOVERED BY:
Dan Kaminsky, IOActive

ORIGINAL ADVISORY:
http://support.citrix.com/article/CTX117991

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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