{"id":7461,"date":"2026-03-31T18:20:15","date_gmt":"2026-03-31T17:20:15","guid":{"rendered":"https:\/\/workboot.fr\/ciela\/?page_id=7461"},"modified":"2026-04-02T08:47:14","modified_gmt":"2026-04-02T07:47:14","slug":"tp3_vb_hacker_telnet","status":"publish","type":"page","link":"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/","title":{"rendered":"TP3_VB_Hacker_telnet"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\ud83d\udd52 : 3 h maximum<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-8f761849 wp-block-group-is-layout-flex\">\n<nav aria-label=\"Table des mati\u00e8res\" class=\"wp-block-table-of-contents\"><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#un-peu-d-histoire\">Un peu d\u2019histoire <\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#telnet-vs-ssh-deux-protocoles-deux-epoques\">Telnet vs SSH : deux protocoles, deux \u00e9poques<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#presentation-but\">Pr\u00e9sentation , But<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#prerequis\">Pr\u00e9requis<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#on-va-creer-un-simple-utilisateur-ici-homer\">on va cr\u00e9er un simple utilisateur ici homer <\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#tcpdump\">tcpdump<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#dans-un-terminal-en-tant-que-root\">Dans un terminal en tant que root<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#donner-le-role-de-l-option-i\">Donner le r\u00f4le de  l&rsquo;option -i<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#pourquoi-port-23\">Pourquoi port 23 ?<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#donner-le-role-de-l-option-w\">Donner le r\u00f4le de l&rsquo;option -w<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#usage-du-client-telnet-permet-de-se-connecter-a-distance-sur-une-machine\">Usage du client telnet (permet de se connecter \u00e0 distance sur une machine)<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#tshark\">tshark<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#le-hacker-va-recuperer-la-captation-de-la-connexion-de-homer-voir-le-tcpdump\">Le hacker , va r\u00e9cup\u00e9rer la captation de la connexion de homer ! (voir le tcpdump)<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#a-quoi-sert-l-option-r\">A quoi sert l&rsquo;option -r <\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#a-quoi-sert-l-option-q\">A quoi sert l&rsquo;option -q<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#a-quoi-sert-l-option-z-follow-tcp-ascii-0\">A quoi sert l&rsquo;option -z follow,tcp,ascii,0<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#retrouver-le-mot-de-passe-de-homer-dans-l-analyse-du-fichier-session-complete-txt\">Retrouver le mot de passe de homer dans l&rsquo;analyse du fichier session_complete.txt<\/a><\/li><\/ol><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/tp3_vb_hacker_telnet\/#evaluation-a-rendre\">\u00c9valuation (\u00e0 rendre)<\/a><\/li><\/ol><\/nav>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-full\"><a href=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2026\/04\/homer_telnet.jpeg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"559\" src=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2026\/04\/homer_telnet.jpeg\" alt=\"\" class=\"wp-image-7538\" srcset=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2026\/04\/homer_telnet.jpeg 1024w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2026\/04\/homer_telnet-300x164.jpeg 300w, https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2026\/04\/homer_telnet-768x419.jpeg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div><\/div>\n\n\n\n<h2 id=\"un-peu-d-histoire\" class=\"wp-block-heading\">Un peu d\u2019histoire <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c0 l\u2019\u00e9poque de Telnet 1969, on ne chiffrait pas parce que :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le r\u00e9seau \u00e9tait petit et r\u00e9serv\u00e9 \u00e0 une communaut\u00e9 de confiance.<\/li>\n\n\n\n<li>Les ordinateurs \u00e9taient trop faibles pour chiffrer sans perdre en performance.<\/li>\n\n\n\n<li>La culture de la s\u00e9curit\u00e9 r\u00e9seau n\u2019existait pas encore.<\/li>\n\n\n\n<li>Il a fallu attendre l\u2019explosion d\u2019Internet et les premi\u00e8res attaques pour que le chiffrement devienne une n\u00e9cessit\u00e9.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"telnet-vs-ssh-deux-protocoles-deux-epoques\" class=\"wp-block-heading\">Telnet vs SSH : deux protocoles, deux \u00e9poques<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Caract\u00e9ristique<\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Telnet<\/strong>&nbsp;(1969 \/ 1983)<\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>SSH<\/strong>&nbsp;(1995)<\/th><\/tr><\/thead><tbody><tr><td><strong>Chiffrement<\/strong><\/td><td>Aucun (tout en clair)<\/td><td>Chiffrement int\u00e9gral des \u00e9changes<\/td><\/tr><tr><td><strong>Authentification<\/strong><\/td><td>Mot de passe transmis en clair<\/td><td>Cl\u00e9s publiques \/ priv\u00e9es, mots de passe chiffr\u00e9s<\/td><\/tr><tr><td><strong>Int\u00e9grit\u00e9 des donn\u00e9es<\/strong><\/td><td>Non v\u00e9rifi\u00e9e<\/td><td>Contr\u00f4le d&rsquo;int\u00e9grit\u00e9 (emp\u00eache la modification en cours de route)<\/td><\/tr><tr><td><strong>Port par d\u00e9faut<\/strong><\/td><td>23<\/td><td>22<\/td><\/tr><tr><td><strong>Utilisation actuelle<\/strong><\/td><td>Quasiment abandonn\u00e9, sauf sur des r\u00e9seaux internes ou \u00e9quipements anciens<\/td><td>Standard universel pour l&rsquo;administration syst\u00e8me \u00e0 distance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 id=\"presentation-but\" class=\"wp-block-heading\">Pr\u00e9sentation , But<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nous allons montrer  ici comment l&rsquo;usage de telnet est dangereux ! on va retrouver en clair  le mot de passe de l&rsquo;utilisateur de telnet.<\/p>\n\n\n\n<h2 id=\"prerequis\" class=\"wp-block-heading\">Pr\u00e9requis<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">on va avoir besoin d&rsquo;une machine debian11 (avec nat) pour acc\u00e9der \u00e0 internet et pouvoir \u00eatre  root , TP pr\u00e9c\u00e9dents <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Savoir utiliser plusieurs compte sur la machine tty1 &#8230; tty7<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">on va y installer telnetd qui un serveur telnet qui existe depuis 1969  !! <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update\nsudo apt install telnetd -y  # installation du serveur telnet \nsudo apt install tshark      #  outil d'analyse de trame <\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">v\u00e9rifier que telnetd est actif !<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl status telnetd<\/code><\/pre>\n\n\n\n<h3 id=\"on-va-creer-un-simple-utilisateur-ici-homer\" class=\"wp-block-heading\">on va cr\u00e9er un simple utilisateur ici homer <\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u00e9thode avec useradd , on a d\u00e9ja vu adduser  TP administration , l&rsquo;avantage ici est que le mot de passe est inject\u00e9 assez rapidement <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo useradd -m homer<br>echo \"homer:motdepasse\" | sudo chpasswd<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">on dispose de la machine pour pi\u00e9ger homer ! <\/p>\n\n\n\n<h2 id=\"tcpdump\" class=\"wp-block-heading\">tcpdump<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est un outil puissant et l\u00e9ger qui permet de&nbsp;<strong>capturer<\/strong>&nbsp;et&nbsp;<strong>afficher<\/strong>&nbsp;les paquets qui circulent sur une interface r\u00e9seau, directement depuis le terminal.<br><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>man tcpdump<\/code><\/pre>\n\n\n\n<h3 id=\"dans-un-terminal-en-tant-que-root\" class=\"wp-block-heading\">Dans un terminal en tant que root<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">nous allons capturer la trame quand homer va vouloir se connecter sur la machine depuis le compte \u00e9tudiant avec le client telnet<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>tcpdump -i lo port 23 -w capture_telnet.pcap -s 0<\/code><\/pre>\n\n\n\n<h4 id=\"donner-le-role-de-l-option-i\" class=\"wp-block-heading\">Donner le r\u00f4le de  l&rsquo;option -i<\/h4>\n\n\n\n<h4 id=\"pourquoi-port-23\" class=\"wp-block-heading\">Pourquoi port 23 ?<\/h4>\n\n\n\n<h4 id=\"donner-le-role-de-l-option-w\" class=\"wp-block-heading\">Donner le r\u00f4le de l&rsquo;option -w<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">ne pas le fermer ! on surveille le port 23 et l&rsquo;interface lo , et on va capturer dans capture_telnet.pcap (pour espionner notre brave homer)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Votre fichier capture_telnet.pcap doit ressembler \u00e0 cela ! <\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>capture_telnet.pcap<\/summary>\n<pre class=\"wp-block-code\"><code>hexdump -C capture_telnet.pcap\n00000000  d4 c3 b2 a1 02 00 04 00  00 00 00 00 00 00 00 00  |................|\n00000010  00 00 04 00 01 00 00 00  f5 f8 cb 69 e3 5e 08 00  |...........i.^..|\n00000020  4a 00 00 00 4a 00 00 00  00 00 00 00 00 00 00 00  |J...J...........|\n00000030  00 00 00 00 08 00 45 10  00 3c 06 9e 40 00 40 06  |......E..&lt;..@.@.|\n00000040  36 0c 7f 00 00 01 7f 00  00 01 b1 20 00 17 c4 12  |6.......... ....|\n00000050  54 e0 00 00 00 00 a0 02  ff d7 fe 30 00 00 02 04  |T..........0....|\n00000060  ff d7 04 02 08 0a 6f 8e  cd 47 00 00 00 00 01 03  |......o..G......|\n00000070  03 07 f5 f8 cb 69 ed 5e  08 00 4a 00 00 00 4a 00  |.....i.^..J...J.|\n00000080  00 00 00 00 00 00 00 00  00 00 00 00 00 00 08 00  |................|\n00000090  45 00 00 3c 00 00 40 00  40 06 3c ba 7f 00 00 01  |E..&lt;..@.@.&lt;.....|\n000000a0  7f 00 00 01 00 17 b1 20  70 40 af d1 c4 12 54 e1  |....... p@....T.|\n000000b0  a0 12 ff cb fe 30 00 00  02 04 ff d7 04 02 08 0a  |.....0..........|\n000000c0  6f 8e cd 47 6f 8e cd 47  01 03 03 07 f5 f8 cb 69  |o..Go..G.......i|\n000000d0  f5 5e 08 00 42 00 00 00  42 00 00 00 00 00 00 00  |.^..B...B.......|\n000000e0  00 00 00 00 00 00 00 00  08 00 45 10 00 34 06 9f  |..........E..4..|\n000000f0  40 00 40 06 36 13 7f 00  00 01 7f 00 00 01 b1 20  |@.@.6.......... |\n00000100  00 17 c4 12 54 e1 70 40  af d2 80 10 02 00 fe 28  |....T.p@.......(|\n00000110  00 00 01 01 08 0a 6f 8e  cd 47 6f 8e cd 47 f5 f8  |......o..Go..G..|\n00000120  cb 69 3f 62 08 00 5a 00  00 00 5a 00 00 00 00 00  |.i?b..Z...Z.....|\n00000130  00 00 00 00 00 00 00 00  00 00 08 00 45 10 00 4c  |............E..L|\n00000140  06 a0 40 00 40 06 35 fa  7f 00 00 01 7f 00 00 01  |..@.@.5.........|\n00000150  b1 20 00 17 c4 12 54 e1  70 40 af d2 80 18 02 00  |. ....T.p@......|\n00000160  fe 40 00 00 01 01 08 0a  6f 8e cd 48 6f 8e cd 47  |.@......o..Ho..G|\n00000170  ff fd 03 ff fb 18 ff fb  1f ff fb 20 ff fb 21 ff  |........... ..!.|\n00000180  fb 22 ff fb 27 ff fd 05  f5 f8 cb 69 45 62 08 00  |.\"..'......iEb..|\n00000190  42 00 00 00 42 00 00 00  00 00 00 00 00 00 00 00  |B...B...........|\n000001a0  00 00 00 00 08 00 45 00  00 34 4a 72 40 00 40 06  |......E..4Jr@.@.|\n000001b0  f2 4f 7f 00 00 01 7f 00  00 01 00 17 b1 20 70 40  |.O........... p@|\n000001c0  af d2 c4 12 54 f9 80 10  02 00 fe 28 00 00 01 01  |....T......(....|\n000001d0  08 0a 6f 8e cd 48 6f 8e  cd 48 f5 f8 cb 69 28 74  |..o..Ho..H...i(t|\n000001e0  08 00 4e 00 00 00 4e 00  00 00 00 00 00 00 00 00  |..N...N.........|\n000001f0  00 00 00 00 00 00 08 00  45 10 00 40 4a 73 40 00  |........E..@Js@.|\n00000200  40 06 f2 32 7f 00 00 01  7f 00 00 01 00 17 b1 20  |@..2........... |\n00000210  70 40 af d2 c4 12 54 f9  80 18 02 00 fe 34 00 00  |p@....T......4..|\n00000220  01 01 08 0a 6f 8e cd 4c  6f 8e cd 48 ff fd 18 ff  |....o..Lo..H....|\n00000230  fd 20 ff fd 23 ff fd 27  f5 f8 cb 69 34 74 08 00  |. ..#..'...i4t..|\n00000240  42 00 00 00 42 00 00 00  00 00 00 00 00 00 00 00  |B...B...........|\n00000250  00 00 00 00 08 00 45 10  00 34 06 a1 40 00 40 06  |......E..4..@.@.|\n00000260  36 11 7f 00 00 01 7f 00  00 01 b1 20 00 17 c4 12  |6.......... ....|\n00000270  54 f9 70 40 af de 80 10  02 00 fe 28 00 00 01 01  |T.p@.......(....|\n00000280  08 0a 6f 8e cd 4c 6f 8e  cd 4c f5 f8 cb 69 5d 74  |..o..Lo..L...i]t|\n00000290  08 00 45 00 00 00 45 00  00 00 00 00 00 00 00 00  |..E...E.........|\n000002a0  00 00 00 00 00 00 08 00  45 10 00 37 06 a2 40 00  |........E..7..@.|\n000002b0  40 06 36 0d 7f 00 00 01  7f 00 00 01 b1 20 00 17  |@.6.......... ..|\n000002c0  c4 12 54 f9 70 40 af de  80 18 02 00 fe 2b 00 00  |..T.p@.......+..|\n000002d0  01 01 08 0a 6f 8e cd 4c  6f 8e cd 4c ff fc 23 f5  |....o..Lo..L..#.|\n000002e0  f8 cb 69 71 74 08 00 63  00 00 00 63 00 00 00 00  |..iqt..c...c....|\n000002f0  00 00 00 00 00 00 00 00  00 00 00 08 00 45 10 00  |.............E..|\n00000300  55 4a 74 40 00 40 06 f2  1c 7f 00 00 01 7f 00 00  |UJt@.@..........|\n00000310  01 00 17 b1 20 70 40 af  de c4 12 54 fc 80 18 02  |.... p@....T....|\n00000320  00 fe 49 00 00 01 01 08  0a 6f 8e cd 4c 6f 8e cd  |..I......o..Lo..|\n00000330  4c ff fb 03 ff fd 1f ff  fd 21 ff fe 22 ff fb 05  |L........!..\"...|\n00000340  ff fa 20 01 ff f0 ff fa  27 01 ff f0 ff fa 18 01  |.. .....'.......|\n00000350  ff f0 f5 f8 cb 69 a1 74  08 00 6d 00 00 00 6d 00  |.....i.t..m...m.|\n00000360  00 00 00 00 00 00 00 00  00 00 00 00 00 00 08 00  |................|\n00000370  45 10 00 5f 06 a3 40 00  40 06 35 e4 7f 00 00 01  |E.._..@.@.5.....|\n00000380  7f 00 00 01 b1 20 00 17  c4 12 54 fc 70 40 af ff  |..... ....T.p@..|\n00000390  80 18 02 00 fe 53 00 00  01 01 08 0a 6f 8e cd 4c  |.....S......o..L|\n000003a0  6f 8e cd 4c ff fa 1f 00  64 00 25 ff f0 ff fa 20  |o..L....d.%.... |\n000003b0  00 33 38 34 30 30 2c 33  38 34 30 30 ff f0 ff fa  |.38400,38400....|\n000003c0  27 00 ff f0 ff fa 18 00  6c 69 6e 75 78 ff f0 f5  |'.......linux...|\n000003d0  f8 cb 69 46 75 08 00 45  00 00 00 45 00 00 00 00  |..iFu..E...E....|\n000003e0  00 00 00 00 00 00 00 00  00 00 00 08 00 45 10 00  |.............E..|\n000003f0  37 4a 75 40 00 40 06 f2  39 7f 00 00 01 7f 00 00  |7Ju@.@..9.......|\n00000400  01 00 17 b1 20 70 40 af  ff c4 12 55 27 80 18 02  |.... p@....U'...|\n00000410  00 fe 2b 00 00 01 01 08  0a 6f 8e cd 4c 6f 8e cd  |..+......o..Lo..|\n00000420  4c ff fd 01 f5 f8 cb 69  56 75 08 00 45 00 00 00  |L......iVu..E...|\n00000430  45 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |E...............|\n00000440  08 00 45 10 00 37 06 a4  40 00 40 06 36 0b 7f 00  |..E..7..@.@.6...|\n00000450  00 01 7f 00 00 01 b1 20  00 17 c4 12 55 27 70 40  |....... ....U'p@|\n00000460  b0 02 80 18 02 00 fe 2b  00 00 01 01 08 0a 6f 8e  |.......+......o.|\n00000470  cd 4d 6f 8e cd 4c ff fc  01 f5 f8 cb 69 c7 75 08  |.Mo..L......i.u.|\n00000480  00 45 00 00 00 45 00 00  00 00 00 00 00 00 00 00  |.E...E..........|\n00000490  00 00 00 00 00 08 00 45  10 00 37 4a 76 40 00 40  |.......E..7Jv@.@|\n000004a0  06 f2 38 7f 00 00 01 7f  00 00 01 00 17 b1 20 70  |..8........... p|\n000004b0  40 b0 02 c4 12 55 2a 80  18 02 00 fe 2b 00 00 01  |@....U*.....+...|\n000004c0  01 08 0a 6f 8e cd 4d 6f  8e cd 4d ff fb 01 f5 f8  |...o..Mo..M.....|\n000004d0  cb 69 e6 75 08 00 45 00  00 00 45 00 00 00 00 00  |.i.u..E...E.....|\n000004e0  00 00 00 00 00 00 00 00  00 00 08 00 45 10 00 37  |............E..7|\n000004f0  06 a5 40 00 40 06 36 0a  7f 00 00 01 7f 00 00 01  |..@.@.6.........|\n00000500  b1 20 00 17 c4 12 55 2a  70 40 b0 05 80 18 02 00  |. ....U*p@......|\n00000510  fe 2b 00 00 01 01 08 0a  6f 8e cd 4d 6f 8e cd 4d  |.+......o..Mo..M|\n00000520  ff fd 01 f5 f8 cb 69 02  76 08 00 57 00 00 00 57  |......i.v..W...W|\n00000530  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 08  |................|\n00000540  00 45 10 00 49 4a 77 40  00 40 06 f2 25 7f 00 00  |.E..IJw@.@..%...|\n00000550  01 7f 00 00 01 00 17 b1  20 70 40 b0 05 c4 12 55  |........ p@....U|\n00000560  2d 80 18 02 00 fe 3d 00  00 01 01 08 0a 6f 8e cd  |-.....=......o..|\n00000570  4d 6f 8e cd 4d 44 65 62  69 61 6e 20 47 4e 55 2f  |Mo..MDebian GNU\/|\n00000580  4c 69 6e 75 78 20 31 31  0d 0a f5 f8 cb 69 5f 21  |Linux 11.....i_!|\n00000590  09 00 42 00 00 00 42 00  00 00 00 00 00 00 00 00  |..B...B.........|\n000005a0  00 00 00 00 00 00 08 00  45 10 00 34 06 a6 40 00  |........E..4..@.|\n000005b0  40 06 36 0c 7f 00 00 01  7f 00 00 01 b1 20 00 17  |@.6.......... ..|\n000005c0  c4 12 55 2d 70 40 b0 1a  80 10 02 00 fe 28 00 00  |..U-p@.......(..|\n000005d0  01 01 08 0a 6f 8e cd 79  6f 8e cd 4d f5 f8 cb 69  |....o..yo..M...i|\n000005e0  6d 21 09 00 4c 00 00 00  4c 00 00 00 00 00 00 00  |m!..L...L.......|\n000005f0  00 00 00 00 00 00 00 00  08 00 45 10 00 3e 4a 78  |..........E..&gt;Jx|\n00000600  40 00 40 06 f2 2f 7f 00  00 01 7f 00 00 01 00 17  |@.@..\/..........|\n00000610  b1 20 70 40 b0 1a c4 12  55 2d 80 18 02 00 fe 32  |. p@....U-.....2|\n00000620  00 00 01 01 08 0a 6f 8e  cd 79 6f 8e cd 79 6d 31  |......o..yo..ym1|\n00000630  20 6c 6f 67 69 6e 3a 20  f5 f8 cb 69 76 21 09 00  | login: ...iv!..|\n00000640  42 00 00 00 42 00 00 00  00 00 00 00 00 00 00 00  |B...B...........|\n00000650  00 00 00 00 08 00 45 10  00 34 06 a7 40 00 40 06  |......E..4..@.@.|\n00000660  36 0b 7f 00 00 01 7f 00  00 01 b1 20 00 17 c4 12  |6.......... ....|\n00000670  55 2d 70 40 b0 24 80 10  02 00 fe 28 00 00 01 01  |U-p@.$.....(....|\n00000680  08 0a 6f 8e cd 79 6f 8e  cd 79 f6 f8 cb 69 b9 75  |..o..yo..y...i.u|\n00000690  0d 00 43 00 00 00 43 00  00 00 00 00 00 00 00 00  |..C...C.........|\n000006a0  00 00 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|...il...B...B...|\n000013e0  00 00 00 00 00 00 00 00  00 00 00 00 08 00 45 10  |..............E.|\n000013f0  00 34 4a 8a 40 00 40 06  f2 27 7f 00 00 01 7f 00  |.4J.@.@..'......|\n00001400  00 01 00 17 b1 20 70 40  b0 35 c4 12 55 40 80 10  |..... p@.5..U@..|\n00001410  02 00 fe 28 00 00 01 01  08 0a 6f 8e e4 d5 6f 8e  |...(......o...o.|\n00001420  e4 d5 fb f8 cb 69 2f e3  08 00 44 00 00 00 44 00  |.....i\/...D...D.|\n00001430  00 00 00 00 00 00 00 00  00 00 00 00 00 00 08 00  |................|\n00001440  45 10 00 36 4a 8b 40 00  40 06 f2 24 7f 00 00 01  |E..6J.@.@..$....|\n00001450  7f 00 00 01 00 17 b1 20  70 40 b0 35 c4 12 55 40  |....... p@.5..U@|\n00001460  80 18 02 00 fe 2a 00 00  01 01 08 0a 6f 8e e4 d9  |.....*......o...|\n00001470  6f 8e e4 d5 0d 0a fb f8  cb 69 36 e3 08 00 42 00  |o........i6...B.|\n00001480  00 00 42 00 00 00 00 00  00 00 00 00 00 00 00 00  |..B.............|\n00001490  00 00 08 00 45 10 00 34  06 c0 40 00 40 06 35 f2  |....E..4..@.@.5.|\n000014a0  7f 00 00 01 7f 00 00 01  b1 20 00 17 c4 12 55 40  |......... ....U@|\n000014b0  70 40 b0 37 80 10 02 00  fe 28 00 00 01 01 08 0a  |p@.7.....(......|\n000014c0  6f 8e e4 d9 6f 8e e4 d9  fb f8 cb 69 2a 51 09 00  |o...o......i*Q..|\n000014d0  59 02 00 00 59 02 00 00  00 00 00 00 00 00 00 00  |Y...Y...........|\n000014e0  00 00 00 00 08 00 45 10  02 4b 4a 8c 40 00 40 06  |......E..KJ.@.@.|\n000014f0  f0 0e 7f 00 00 01 7f 00  00 01 00 17 b1 20 70 40  |............. p@|\n00001500  b0 37 c4 12 55 40 80 18  02 00 00 40 00 00 01 01  |.7..U@.....@....|\n00001510  08 0a 6f 8e e4 f5 6f 8e  e4 d9 4c 69 6e 75 78 20  |..o...o...Linux |\n00001520  6d 31 20 35 2e 31 30 2e  30 2d 33 39 2d 61 6d 64  |m1 5.10.0-39-amd|\n00001530  36 34 20 23 31 20 53 4d  50 20 44 65 62 69 61 6e  |64 #1 SMP Debian|\n00001540  20 35 2e 31 30 2e 32 35  31 2d 31 20 28 32 30 32  | 5.10.251-1 (202|\n00001550  36 2d 30 33 2d 30 39 29  20 78 38 36 5f 36 34 0d  |6-03-09) x86_64.|\n00001560  0a 44 65 62 69 61 6e 20  31 31 2e 32 20 20 32 39  |.Debian 11.2  29|\n00001570  2f 30 39 2f 32 30 32 35  0d 0a 5f 5f 5f 5f 5f 5f  |\/09\/2025..______|\n00001580  5f 5f 20 20 20 20 20 20  20 20 20 20 20 20 20 5f  |__             _|\n00001590  5f 5f 5f 5f 20 20 20 20  20 20 20 20 20 20 20 20  |____            |\n000015a0  20 20 20 0d 0a 5f 5f 5f  20 20 5f 5f 20 5c 5f 5f  |   ..___  __ \\__|\n000015b0  5f 5f 5f 5f 5f 5f 5f 5f  5f 5f 5f 5f 5f 28 5f 29  |_____________(_)|\n000015c0  5f 5f 5f 5f 5f 20 5f 5f  5f 5f 5f 5f 5f 20 0d 0a  |_____ _______ ..|\n000015d0  5f 5f 20 20 2f 20 2f 20  2f 20 20 5f 5f 20 5c 5f  |__  \/ \/ \/  __ \\_|\n000015e0  20 20 5f 5f 5f 2f 5f 20  20 2f 5f 20 20 5f 5f 20  |  ___\/_  \/_  __ |\n000015f0  60 2f 5f 20 20 5f 5f 20  5c 0d 0a 5f 20 20 2f 5f  |`\/_  __ \\.._  \/_|\n00001600  2f 20 2f 2f 20 2f 5f 2f  20 2f 20 20 2f 20 20 20  |\/ \/\/ \/_\/ \/  \/   |\n00001610  5f 20 20 2f 20 2f 20 2f  5f 2f 20 2f 5f 20 20 2f  |_  \/ \/ \/_\/ \/_  \/|\n00001620  20 2f 20 2f 0d 0a 2f 5f  5f 5f 5f 5f 2f 20 5c 5f  | \/ \/..\/_____\/ \\_|\n00001630  5f 5f 5f 2f 2f 5f 2f 20  20 20 20 2f 5f 2f 20 20  |___\/\/_\/    \/_\/  |\n00001640  5c 5f 5f 2c 5f 2f 20 2f  5f 2f 20 2f 5f 2f 20 0d  |\\__,_\/ \/_\/ \/_\/ .|\n00001650  0a 6d 61 63 68 69 6e 65  20 72 c3 a9 67 6c c3 a9  |.machine r..gl..|\n00001660  65 20 70 6f 75 72 61 20  6d 61 69 73 6f 6e 20 73  |e poura maison s|\n00001670  61 6e 73 20 61 75 63 75  6e 20 70 72 6f 78 79 20  |ans aucun proxy |\n00001680  28 2f 65 74 63 2f 65 6e  76 69 72 6f 6e 6d 65 6e  |(\/etc\/environmen|\n00001690  74 29 0d 0a 72 6f 6f 74  20 2f 20 70 61 73 73 77  |t)..root \/ passw|\n000016a0  64 3a 20 64 65 62 69 61  6e 0d 0a 20 20 20 20 20  |d: debian..     |\n000016b0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |\n000016c0  20 20 20 20 20 20 20 20  20 20 0d 0a 6c 6f 67 69  |          ..logi|\n000016d0  6e 20 3a 65 74 75 64 69  61 6e 74 0d 0a 70 61 73  |n :etudiant..pas|\n000016e0  73 77 64 3a 65 74 75 64  69 61 6e 74 0d 0a 4c 61  |swd:etudiant..La|\n000016f0  73 74 20 6c 6f 67 69 6e  3a 20 54 75 65 20 4d 61  |st login: Tue Ma|\n00001700  72 20 33 31 20 31 38 3a  34 30 3a 30 39 20 43 45  |r 31 18:40:09 CE|\n00001710  53 54 20 32 30 32 36 20  66 72 6f 6d 20 6c 6f 63  |ST 2026 from loc|\n00001720  61 6c 68 6f 73 74 20 6f  6e 20 70 74 73 2f 30 0d  |alhost on pts\/0.|\n00001730  0a fb f8 cb 69 33 51 09  00 42 00 00 00 42 00 00  |....i3Q..B...B..|\n00001740  00 00 00 00 00 00 00 00  00 00 00 00 00 08 00 45  |...............E|\n00001750  10 00 34 06 c1 40 00 40  06 35 f1 7f 00 00 01 7f  |..4..@.@.5......|\n00001760  00 00 01 b1 20 00 17 c4  12 55 40 70 40 b2 4e 80  |.... ....U@p@.N.|\n00001770  10 01 fc fe 28 00 00 01  01 08 0a 6f 8e e4 f5 6f  |....(......o...o|\n00001780  8e e4 f5 fb f8 cb 69 25  b8 09 00 4a 00 00 00 4a  |......i%...J...J|\n00001790  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 08  |................|\n000017a0  00 45 10 00 3c 4a 8d 40  00 40 06 f2 1c 7f 00 00  |.E..&lt;J.@.@......|\n000017b0  01 7f 00 00 01 00 17 b1  20 70 40 b2 4e c4 12 55  |........ p@.N..U|\n000017c0  40 80 18 02 00 fe 30 00  00 01 01 08 0a 6f 8e e5  |@.....0......o..|\n000017d0  0f 6f 8e e4 f5 1b 5b 3f  32 30 30 34 68 fb f8 cb  |.o....&#91;?2004h...|\n000017e0  69 2f b8 09 00 42 00 00  00 42 00 00 00 00 00 00  |i\/...B...B......|\n000017f0  00 00 00 00 00 00 00 00  00 08 00 45 10 00 34 06  |...........E..4.|\n00001800  c2 40 00 40 06 35 f0 7f  00 00 01 7f 00 00 01 b1  |.@.@.5..........|\n00001810  20 00 17 c4 12 55 40 70  40 b2 56 80 10 01 fc fe  | ....U@p@.V.....|\n00001820  28 00 00 01 01 08 0a 6f  8e e5 0f 6f 8e e5 0f fb  |(......o...o....|\n00001830  f8 cb 69 78 b8 09 00 4e  00 00 00 4e 00 00 00 00  |..ix...N...N....|\n00001840  00 00 00 00 00 00 00 00  00 00 00 08 00 45 10 00  |.............E..|\n00001850  40 4a 8e 40 00 40 06 f2  17 7f 00 00 01 7f 00 00  |@J.@.@..........|\n00001860  01 00 17 b1 20 70 40 b2  56 c4 12 55 40 80 18 02  |.... p@.V..U@...|\n00001870  00 fe 34 00 00 01 01 08  0a 6f 8e e5 0f 6f 8e e5  |..4......o...o..|\n00001880  0f 68 6f 6d 65 72 40 6d  31 3a 7e 24 20 fb f8 cb  |.homer@m1:~$ ...|\n00001890  69 86 b8 09 00 42 00 00  00 42 00 00 00 00 00 00  |i....B...B......|\n000018a0  00 00 00 00 00 00 00 00  00 08 00 45 10 00 34 06  |...........E..4.|\n000018b0  c3 40 00 40 06 35 ef 7f  00 00 01 7f 00 00 01 b1  |.@.@.5..........|\n000018c0  20 00 17 c4 12 55 40 70  40 b2 62 80 10 01 fc fe  | ....U@p@.b.....|\n000018d0  28 00 00 01 01 08 0a 6f  8e e5 0f 6f 8e e5 0f     |(......o...o...|\n000018df\n<\/code><\/pre>\n<\/details>\n\n\n\n<h3 id=\"usage-du-client-telnet-permet-de-se-connecter-a-distance-sur-une-machine\" class=\"wp-block-heading\">Usage du client telnet (permet de se connecter \u00e0 distance sur une machine)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">dans un autre terminal , se connecter en tant qu&rsquo;etudiant (un simple user qui va pr\u00eater son acc\u00e8s \u00e0 homer)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Homer va comme un grand na\u00eff se connecter ! avec une session le client telnet <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>telnet 127.0.0.1<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>login: homer\npassword: <strong>motdepasse<\/strong><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">trop tard homer !! a fait l&rsquo;erreur de sa vie !<\/p>\n\n\n\n<h2 id=\"tshark\" class=\"wp-block-heading\">tshark<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">TShark est la version en ligne de commande de Wireshark, le c\u00e9l\u00e8bre analyseur de protocoles r\u00e9seau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.wireshark.org\/docs\/man-pages\/tshark.html\">https:\/\/www.wireshark.org\/docs\/man-pages\/tshark.html<\/a><\/p>\n\n\n\n<h3 id=\"le-hacker-va-recuperer-la-captation-de-la-connexion-de-homer-voir-le-tcpdump\" class=\"wp-block-heading\">Le hacker , va r\u00e9cup\u00e9rer la captation de la connexion de homer ! (voir le tcpdump)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">maintenant vous retourner dans votre session root .. et ctrl+c pour interrompre la capture !<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ensuite l&rsquo;expert !! vous !! va utilser tshark (wireshark en texte) qui va d\u00e9coder la capture (le fichier .pcap)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>tshark -r capture_telnet.pcap -q -z follow,tcp,ascii,0 &gt; session_complete.txt\ncat session_complete.txt<\/code><\/pre>\n\n\n\n<h4 id=\"a-quoi-sert-l-option-r\" class=\"wp-block-heading\">A quoi sert l&rsquo;option -r <\/h4>\n\n\n\n<h4 id=\"a-quoi-sert-l-option-q\" class=\"wp-block-heading\">A quoi sert l&rsquo;option -q<\/h4>\n\n\n\n<h4 id=\"a-quoi-sert-l-option-z-follow-tcp-ascii-0\" class=\"wp-block-heading\">A quoi sert l&rsquo;option -z follow,tcp,ascii,0<\/h4>\n\n\n\n<h4 id=\"retrouver-le-mot-de-passe-de-homer-dans-l-analyse-du-fichier-session-complete-txt\" class=\"wp-block-heading\">Retrouver le mot de passe de homer dans l&rsquo;analyse du fichier session_complete.txt<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">normalement vous devez obtenir quelque chose comme cela :<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>session_complete.txt<\/summary>\n<pre class=\"wp-block-code\"><code>cat session_telnet.txt \n\n===================================================================\nFollow: tcp,ascii\nFilter: tcp.stream eq 0\nNode 0: 127.0.0.1:45344\nNode 1: 127.0.0.1:23\n24\n........... ..!..\"..'...\n\t12\n..... ..#..'\n3\n..#\n\t33\n........!..\"..... .....'.........\n43\n....d.%.... .38400,38400....'.......linux..\n\t3\n...\n3\n...\n\t3\n...\n3\n...\n\t21\nDebian GNU\/Linux 11\n\n\t10\nm1 login: \n1\nh\n\t1\nh\n1\no\n\t1\no\n1\nm\n\t1\nm\n1\ne\n\t1\ne\n1\nr\n\t1\nr\n2\n.\n\t2\n\n\n\t10\nPassword: \n1\nm\n1\no\n1\nt\n1\nd\n1\ne\n1\np\n1\na\n1\ns\n1\ns\n1\ne\n2\n.\n\t2\n\n\n\t535\nLinux m1 5.10.0-39-amd64 #1 SMP Debian 5.10.251-1 (2026-03-09) x86_64\nDebian 11.2  29\/09\/2025\n________             _____               \n___  __ \\_______________(_)_____ _______ \n__  \/ \/ \/  __ \\_  ___\/_  \/_  __ `\/_  __ \\\n_  \/_\/ \/\/ \/_\/ \/  \/   _  \/ \/ \/_\/ \/_  \/ \/ \/\n\/_____\/ \\____\/\/_\/    \/_\/  \\__,_\/ \/_\/ \/_\/ \nmachine r..gl..e poura maison sans aucun proxy (\/etc\/environment)\nroot \/ passwd: debian\n                               \nlogin :etudiant\npasswd:etudiant\nLast login: Tue Mar 31 18:40:09 CEST 2026 from localhost on pts\/0\n\n\t8\n.&#91;?2004h\n\t12\nhomer@m1:~$ \n===================================================================\n<\/code><\/pre>\n<\/details>\n\n\n\n<h2 id=\"evaluation-a-rendre\" class=\"wp-block-heading\">\u00c9valuation (\u00e0 rendre)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Question 1 :<\/strong>&nbsp;Quelle commande permet de capturer le trafic Telnet ?<\/li>\n\n\n\n<li><strong>Question 2 :<\/strong>&nbsp;Expliquez pourquoi le mot de passe appara\u00eet caract\u00e8re par caract\u00e8re dans la capture.<\/li>\n\n\n\n<li><strong>Question 3 :<\/strong>&nbsp;Quelle commande permet de reconstituer la conversation Telnet ?<\/li>\n\n\n\n<li><strong>Question 4 :<\/strong>&nbsp;Citez deux raisons pour lesquelles Telnet est dangereux.<\/li>\n\n\n\n<li><strong>Question 5 :<\/strong>&nbsp;Quel protocole doit-on utiliser \u00e0 la place ? Pourquoi ?<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Protocole<\/th><th class=\"has-text-align-left\" data-align=\"left\">Mot de passe visible<\/th><th class=\"has-text-align-left\" data-align=\"left\">Recommand\u00e9<\/th><\/tr><\/thead><tbody><tr><td><strong>Telnet<\/strong><\/td><td>\u2705 OUI<\/td><td>\u274c NON<\/td><\/tr><tr><td><strong>SSH<\/strong><\/td><td>\u274c NON<\/td><td>\u2705 OUI<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd52 : 3 h maximum Un peu d\u2019histoire \u00c0 l\u2019\u00e9poque de Telnet 1969, on ne chiffrait pas parce que : Telnet vs SSH : deux protocoles, deux \u00e9poques Caract\u00e9ristique Telnet&nbsp;(1969 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-7461","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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