[Cerowrt-devel] Possibly Serious Compromise

[William Katsak]

I"m having a possible very serious issue with Cero. I started noticing 
slow internet access today and checked the router. I noticed a boatload 
of dns resolutions. These push the router load over 1, and eventually 
dnsmasq crashes and has to be restarted.

After tracing it for an hour or so and ruling out misbehaving software 
on the local net, I enabled logging in dnsmasq and saw that the 
resolutions were coming from 127.0.0.1. I kept running netstat -up until 
I saw some of the connections, and saw that they were coming from lua. 
All of the requests seem to be reverse DNS lookups of all kinds of crazy 
IPs.

These requests look like part of some attack/compromise. If I kill 
lighthttpd, everything settles down and runs fine. If I turn it back on, 
the traffic starts again. I am thinking some kind of vulnerability in 
the http server allowing malformed requests from outside? I can't for 
the life of me figure out how they are getting in though. I have very 
few changes to the firewall config, and only a few port forwards.

I'll send more info as I get it.

Anyone else see anything like this?

-Bill


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William Katsak <wkatsak at gmail.com>
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