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Nebula level06 write-up

In Level06 all we are said is that flag06 user comes from a legacy unix system. There is nothing special in his home folder. Lets take a look at the /etc/passwd file: [email protected]:/home/flag06$ cat /etc/passwd root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/bin/sh bin:x:2:2:bin:/bin:/bin/sh sys:x:3:3:sys:/dev:/bin/sh sync:x:4:65534:sync:/bin:/bin/sync games:x:5:60:games:/usr/games:/bin/sh man:x:6:12:man:/var/cache/man:/bin/sh lp:x:7:7:lp:/var/spool/lpd:/bin/sh mail:x:8:8:mail:/var/mail:/bin/sh news:x:9:9:news:/var/spool/news:/bin/sh uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh proxy:x:13:13:proxy:/bin:/bin/sh www-data:x:33:33:www-data:/var/www:/bin/sh backup:x:34:34:backup:/var/backups:/bin/sh list:x:38:38:Mailing List Manager:/var/list:/bin/sh irc:x:39:39:ircd:/var/run/ircd:/bin/sh gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh nobody:x:65534:65534:nobody:/nonexistent:/bin/sh libuuid:x:100:101::/var/lib/libuuid:/bin/sh syslog:x:101:103::/home/syslog:/bin/false messagebus:x:102:104::/var/run/dbus:/bin/false nebula:x:1000:1000:nebula,,,:/home/nebula:/bin/bash sshd:x:103:65534::/var/run/sshd:/usr/sbin/nologin level00:x:1001:1001::/home/level00:/bin/sh flag00:x:999:999::/home/flag00:/bin/sh level01:x:1002:1002::/home/level01:/bin/sh flag01:x:998:998::/home/flag01:/bin/sh level02:x:1003:1003::/home/level02:/bin/sh flag02:x:997:997::/home/flag02:/bin/sh level03:x:1004:1004::/home/level03:/bin/sh flag03:x:996:996::/home/flag03:/bin/sh level04:x:1005:1005::/home/level04:/bin/sh flag04:x:995:995::/home/flag04:/bin/sh level05:x:1006:1006::/home/level05:/bin/sh flag05:x:994:994::/home/flag05:/bin/sh level06:x:1007:1007::/home/level06:/bin/sh flag06:ueqwOCnSGdsuM:993:993::/home/flag06:/bin/sh level07:x:1008:1008::/home/level07:/bin/sh flag07:x:992:992::/home/flag07:/bin/sh level08:x:1009:1009::/home/level08:/bin/sh flag08:x:991:991::/home/flag08:/bin/sh level09:x:1010:1010::/home/level09:/bin/sh flag09:x:990:990::/home/flag09:/bin/sh level10:x:1011:1011::/home/level10:/bin/sh flag10:x:989:989::/home/flag10:/bin/sh level11:x:1012:1012::/home/level11:/bin/sh flag11:x:988:988::/home/flag11:/bin/sh level12:x:1013:1013::/home/level12:/bin/sh flag12:x:987:987::/home/flag12:/bin/sh level13:x:1014:1014::/home/level13:/bin/sh flag13:x:986:986::/home/flag13:/bin/sh level14:x:1015:1015::/home/level14:/bin/sh flag14:x:985:985::/home/flag14:/bin/sh level15:x:1016:1016::/home/level15:/bin/sh flag15:x:984:984::/home/flag15:/bin/sh level16:x:1017:1017::/home/level16:/bin/sh flag16:x:983:983::/home/flag16:/bin/sh level17:x:1018:1018::/home/level17:/bin/sh flag17:x:982:982::/home/flag17:/bin/sh level18:x:1019:1019::/home/level18:/bin/sh flag18:x:981:981::/home/flag18:/bin/sh level19:x:1020:1020::/home/level19:/bin/sh flag19:x:980:980::/home/flag19:/bin/sh Nice, we can try to crack it with John the Ripper (this remainds me my collage days …).