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The following security advisory is sent to the securiteam mailing list, and can be found at the
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UDP Bypassing in Kerio Firewall (UDP Scan)
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SUMMARY
<http://www.kerio.com/us/products.html> Kerio develops a free firewall
that is shipped with default rules. Every incoming / outgoing packet is
compared against the default rule-set. As the first rule accepts incoming
packets if remote port is equal to 53 (DNS) the firewall can be easily
bypassed by setting the source port of the attack to 53.
DETAILS
Vulnerable systems:
* Kerio Firewall version 2.1.4
Exploit:
Using the following line will allow you to scan port 1900 on a remote
server:
nmap -v -P0 -sU -p 1900 192.168.0.5 -g 53
ADDITIONAL INFORMATION
The information has been provided by <mailto:conde0@telefonica.net> David
F. Madrid.
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