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TITLE:
Citrix Access Gateway DNS Cache Poisoning

SECUNIA ADVISORY ID:
SA31594

VERIFY ADVISORY:
http://secunia.com/advisories/31594/

CRITICAL:
Moderately critical

IMPACT:
Spoofing

WHERE:
>From remote

OPERATING SYSTEM:
Citrix Access Gateway 4.x
http://secunia.com/product/6168/

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

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

The vulnerability is reported in all versions of the Access Gateway
Standard and Advanced Edition appliance firmware up to and including
v 4.5.7 Rev A.

SOLUTION:
Firmware versions 4.5 and later:
Apply firmware hotfix.
http://support.citrix.com/article/CTX116762

Firmware versions prior to 4.5:
The vendor recommends to contact the customer support representative
for assistance.

PROVIDED AND/OR DISCOVERED BY:
Dan Kaminsky, IOActive

ORIGINAL ADVISORY:
http://support.citrix.com/article/CTX118183

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About:
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Please Note:
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