[Snort-sigs] new rule for detect windows NAT DNS DoS
bhartstein at ...274...
Tue Oct 31 11:01:26 EST 2006
My data shows this also valid over tcp.
This rule is too generic, I tested it with a large amount of DNS traffic
and legitimate requests cause false positives very frequently, namely:
The header field "Questions" has a value of 00 01
And the data following contains multiple null bytes.
Is there a better way to anchor this detection?
> please check and maybe add this new rule :
> dns.rules:alert udp $EXTERNAL_NET any -> $HOME_NET 53 (msg:"DNS Windows
> NAT DoS attempt"; content:"|01 00|"; offset:2; content:"|00 00|";
> offset:10; reference:cve,2006-5614; classtype:bad-unknown; rev:1;)
> "Overview: Microsoft Windows NAT Helper components (ipnathlp.dll) on
> windows XP SP2, when internet connection sharing is enabled, allows remote
> attackers to cause DoS (svchost.exe crash) via malformed DNS query, which
> results in a null pointer dereference."
> Any suggestions and improvements are welcome,
> This rule is offered by Crusoe Researches (Team)
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
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> Snort-sigs at lists.sourceforge.net
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