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Re: unusual packet (tcpdump shows): rad-#0 41 [id 0] Attr[: msg#00183

security.incidents

Subject:	Re: unusual packet (tcpdump shows): rad-#0 41 [id 0] Attr[

On Fri, Oct 18, 2002 at 01:31:15PM -0000, Melt Man wrote:
> 20:32:22.658735 200.213.38.137.1812 > XX.XX.XX.XX.1812: rad-#0 41
> [id 0] Attr[ Term_action Term_action Term_action Term_ac
> tion Term_action Term_action Term_action Term_action Term_action
> Term_action Term_action

This is probably the Slapper worm. One variant of it uses udp/1812
to communicate with other infected servers. However, udp/1812 is
registered for RADIUS authentication, and tcpdump knows that, so it's
trying to decode the packet as if it were a RADIUS authentication
request. For more info:

http://isc.incidents.org/analysis.html?id=175

-James

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