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O regula simpla cu care puteti face logging sau puteti bloca shellshock. iptables -I INPUT -p tcp -m string --algo bm --string "() {" --dport 80 -j LOG --log-prefix "shellshock rule 1: " Cum apare ? pluto:~# dmesg [12526689.726816] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=192.185.82.92 DST=xxx.xxx.88.5 LEN=287 TOS=0x00 PREC=0x00 TTL=45 ID=21610 DF PROTO=TCP SPT=39893 DPT=80 WINDOW=229 RES=0x00 ACK PSH URGP=0 [12573352.452710] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=108.163.187.146 DST=xxx.xxx.88.10 LEN=421 TOS=0x00 PREC=0x00 TTL=48 ID=25760 DF PROTO=TCP SPT=42647 DPT=80 WINDOW=115 RES=0x00 ACK PSH URGP=0 [12573362.110534] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=184.106.196.169 DST=xxx.xxx.88.7 LEN=419 TOS=0x00 PREC=0x00 TTL=48 ID=55433 DF PROTO=TCP SPT=40201 DPT=80 WINDOW=183 RES=0x00 ACK PSH URGP=0 [12573364.514235] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=110.44.30.204 DST=xxx.xxx.88.6 LEN=429 TOS=0x00 PREC=0x00 TTL=40 ID=20190 DF PROTO=TCP SPT=38820 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12573369.889964] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=194.28.86.63 DST=xxx.xxx.88.5 LEN=420 TOS=0x00 PREC=0x00 TTL=56 ID=32172 DF PROTO=TCP SPT=48732 DPT=80 WINDOW=115 RES=0x00 ACK PSH URGP=0 [12576046.844450] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=72.249.151.145 DST=xxx.xxx.88.5 LEN=428 TOS=0x00 PREC=0x00 TTL=48 ID=11314 DF PROTO=TCP SPT=46735 DPT=80 WINDOW=229 RES=0x00 ACK PSH URGP=0 [12581893.832430] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=89.47.247.48 DST=xxx.xxx.88.4 LEN=427 TOS=0x00 PREC=0x00 TTL=56 ID=47806 DF PROTO=TCP SPT=40027 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582722.880301] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=394 TOS=0x00 PREC=0x00 TTL=51 ID=34666 DF PROTO=TCP SPT=45498 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582723.333809] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=397 TOS=0x00 PREC=0x00 TTL=51 ID=59992 DF PROTO=TCP SPT=45599 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582723.800026] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=370 TOS=0x00 PREC=0x00 TTL=51 ID=5234 DF PROTO=TCP SPT=45681 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582724.856256] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=367 TOS=0x00 PREC=0x00 TTL=51 ID=13614 DF PROTO=TCP SPT=45879 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582725.330168] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=379 TOS=0x00 PREC=0x00 TTL=51 ID=19157 DF PROTO=TCP SPT=45962 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582725.800422] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=397 TOS=0x00 PREC=0x00 TTL=51 ID=53517 DF PROTO=TCP SPT=46069 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582726.258118] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=370 TOS=0x00 PREC=0x00 TTL=51 ID=53738 DF PROTO=TCP SPT=46149 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582726.708889] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=180.210.205.209 DST=xxx.xxx.88.10 LEN=367 TOS=0x00 PREC=0x00 TTL=51 ID=29443 DF PROTO=TCP SPT=46236 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12582822.019042] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=23.95.95.168 DST=xxx.xxx.88.8 LEN=426 TOS=0x00 PREC=0x00 TTL=45 ID=51576 DF PROTO=TCP SPT=47145 DPT=80 WINDOW=115 RES=0x00 ACK PSH URGP=0 [12583500.543438] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=173.83.247.209 DST=xxx.xxx.88.6 LEN=304 TOS=0x00 PREC=0x00 TTL=54 ID=35104 DF PROTO=TCP SPT=57258 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12584394.167981] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=103.23.21.67 DST=xxx.xxx.88.5 LEN=427 TOS=0x00 PREC=0x00 TTL=45 ID=29985 DF PROTO=TCP SPT=44368 DPT=80 WINDOW=115 RES=0x00 ACK PSH URGP=0 [12606520.929034] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=94.23.42.182 DST=xxx.xxx.88.7 LEN=419 TOS=0x00 PREC=0x00 TTL=58 ID=19046 DF PROTO=TCP SPT=36147 DPT=80 WINDOW=115 RES=0x00 ACK PSH URGP=0 [12606529.908862] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=85.232.60.34 DST=xxx.xxx.88.5 LEN=420 TOS=0x00 PREC=0x00 TTL=51 ID=14367 DF PROTO=TCP SPT=49751 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12606541.611815] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=67.198.141.98 DST=xxx.xxx.88.6 LEN=429 TOS=0x00 PREC=0x00 TTL=51 ID=8906 DF PROTO=TCP SPT=33844 DPT=80 WINDOW=229 RES=0x00 ACK PSH URGP=0 [12609706.584728] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=67.23.9.241 DST=xxx.xxx.88.5 LEN=428 TOS=0x00 PREC=0x00 TTL=45 ID=10222 DF PROTO=TCP SPT=43102 DPT=80 WINDOW=92 RES=0x00 ACK PSH URGP=0 [12616465.783127] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=67.23.9.241 DST=xxx.xxx.122.5 LEN=427 TOS=0x00 PREC=0x00 TTL=45 ID=24709 DF PROTO=TCP SPT=40671 DPT=80 WINDOW=92 RES=0x00 ACK PSH URGP=0 [12617580.394705] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=213.238.169.117 DST=xxx.xxx.88.8 LEN=426 TOS=0x00 PREC=0x00 TTL=47 ID=13535 DF PROTO=TCP SPT=58437 DPT=80 WINDOW=115 RES=0x00 ACK PSH URGP=0 [12619408.726456] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=202.181.246.66 DST=xxx.xxx.88.5 LEN=427 TOS=0x00 PREC=0x00 TTL=41 ID=13254 DF PROTO=TCP SPT=26414 DPT=80 WINDOW=46 RES=0x00 ACK PSH URGP=0 [12659626.759636] shellshock rule 1: IN=eth0 OUT= MAC=ac:22:0b:79:90:62:c4:71:fe:11:f9:ff:08:00 SRC=192.254.250.180 DST=xxx.xxx.102.3 LEN=293 TOS=0x00 PREC=0x00 TTL=46 ID=61584 DF PROTO=TCP SPT=22274 DPT=80 WINDOW=229 RES=0x00 ACK PSH URGP=0 Note: - Am specificat doar port 80 iar regula este doar pentru logging. Se poate adauga una pentru logging si alta pentru reject/drop - Mai multe despre shellshock aici: http://en.wikipedia.org/wiki/Shellshock_(software_bug) - Mi-a venit ideea asta pentru ca multi sunt tentati sa foloseasca snort. Probabil stiti ca la reguli multe, snort consuma foarte multe resurse CPU
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