The simplest way is to use fail2ban.
What OS are you using?
it is possible an attack but it's not 100%.
What you can do is to also disable access using the proxy to this
destination IP and address.
100% CPU in many cases is not something odd but you can try fail2ban
with a special rule to block this client in the iptables of the machine
(if this is a linux..)
Eliezer
On 23/10/2015 00:43, Job wrote:
Hello,
sometimes, for about half an hour, tour Squid becomes unstable and, by typing "top -s", Squid is taking the 100% of the CPU.
In Squid's access.log, i see lots of entry like this:
"Thu";"Oct";"22";"11:45:17";"2015";"21328";"192.168.1.250";"TCP_MISS/000";"0";"GET";"http://192.168.1.254:8080/cgi-bin/a2/out.cgi";"-";"DIRECT/192.168.1.254";"-";
"Thu";"Oct";"22";"11:45:18";"2015";"19153";"192.168.1.250";"TCP_MISS/000";"0";"GET";"http://192.168.1.254:8080/cgi-bin/a2/out.cgi";"-";"DIRECT/192.168.1.254";"-";
"Thu";"Oct";"22";"11:45:18";"2015";"20346";"192.168.1.250";"TCP_MISS/000";"0";"GET";"http://192.168.1.254:8080/cgi-bin/a2/out.cgi";"-";"DIRECT/192.168.1.254";"-";
"Thu";"Oct";"22";"11:45:21";"2015";"20391";"192.168.1.250";"TCP_MISS/000";"0";"GET";"http://192.168.1.254:8080/cgi-bin/a2/out.cgi";"-";"DIRECT/192.168.1.254";"-";
"Thu";"Oct";"22";"11:45:21";"2015";"19142";"192.168.1.250";"TCP_MISS/000";"0";"GET";"http://192.168.1.254:8080/cgi-bin/a2/out.cgi";"-";"DIRECT/192.168.1.254";"-";
"Thu";"Oct";"22";"11:45:22";"2015";"19075";"192.168.1.250";"TCP_MISS/000";"0";"GET";"http://192.168.1.254:8080/cgi-bin/a2/out.cgi";"-";"DIRECT/192.168.1.254";"-";
There seem be a possible attack/exploit from an internal machine? It is the 192.168.1.250 in the example.
Is there a patch or something to not spread up Squid to the 100% cpu limit for these "Attacks"?
Thank you!
Francesco
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