Skip to main content

Scanning the world with Sipvicious


Hi, I´m scanning a large number of ranges with Sipvicious ("svmap.py") and I would like to share some tips which helped me during the process:

- The use of sessions (-s) and reports ("svreport.py") is necessary to prevent mixing of obtained data.

- It´s a good idea to scan not only port 5060, you should add successive ports because some sysadmins configure their SIP services to run there (-p5060-5065).

- There is a well known "problem" about SIP and NAT, if you have installed an Asterisk you have heard about it sure :(, so we need to specify our external IP address to Sipvicious with (-x) parameter. Moreover port 5060(Sipvicious outcoming port) has to be forwarded to host which is scanning, in case that you were scanning with more than one instance at the same time successive ports should be forwarded too. I usually put the host int the DMZ trying to avoid these problems.

- "svreport.py" tries to make a DNS lookup with the discovered IPs but it takes too much time in case of too many hosts so we can disable it (-n).

- Normally, some hosts aren't recognized and marked as "unknown", you could run tcpdump in order to capture the responses and avoid the loss of information.

- I wrote that dirty bash script which reflects exposed ideas:

Code:
-----------------------------------------
#!/bin/bash
# It scans ranges from a text file with sipvicious
# Use: ./scanRange.sh

SVMAP="/home/baguira/Installed/sipvicious/svmap.py"
SVREPORT="/home/baguira/Installed/sipvicious/svreport.py"

# just in case "unknown" devices
sudo tcpdump udp and dst host 192.168.9.5 -s 65535 -w capture1.pcap &
# scan all ranges
for RANGE in $(cat ranges1.txt)
do
RNAME=$(echo $RANGE | awk -F / '{print $1}')
EXTIP=$(curl -s icanhazip.com)
$SVMAP -p5060-5065 -s $RNAME -x $EXTIP --randomize $RANGE
NEXTIP=$(curl -s icanhazip.com)
# external ip change check
if [ "$EXTIP" != "$NEXTIP" ]
then
# wait until router finish reboot
sleep 180
$SVREPORT delete -s $RNAME
EXTIP=$(curl -s icanhazip.com)
$SVMAP -p5060-5065 -s $RNAME -x $EXTIP --randomize $RANGE
fi
$SVREPORT export -s $RNAME -f txt -o $RNAME.txt -n
done
sudo killall tcpdump > /dev/null
-----------------------------------------

To sum up I would like to thank Sandro Gauci (Sipvicious developer) for the software and for being really nice whith my doubts. Thank you man! ;)

Labels:

Popular posts from this blog

SIP INVITE attack with Metasploit

Some days ago my friend  @pepeluxx  wrote  another post  about INVITE attacks. He spoke about a  @sinologic   project  which allows to everybody passing some security tests to SIP servers. Furthermore he also published a perl script to do the same task. So I implemented it on Metasploit because I think It could be really useful during a pentesting. It’s interesting because these attacks are really dangerous, normally, attackers try to call to expensive locations. This target numbers often have special charges and they make money with this. Here there are two well known examples: http://blog.sipvicious.org/2010/12/11-million-euro-loss-in-voip-fraud-and.html http://snapvoip.blogspot.com.es/2009/02/calls-to-cuba-and-voip-attacks.html I’m not going to deep in this vector because of being a well known (and old!!) one. Basically the attacker tries to make a call using a misconfigured PBX. This is allowed because  SIP RFC  says that an ...
Read more

Flooding Asterisk, Freeswitch and Kamailio with Metasploit

Hi, it has been a long time since my last post because of my new job and my final year project ("VoIP denegation of service attacks" for curious) but there is something I found during my tests with  Freeswitch ,  Kamailio  and  Asterisk  that I want to share. NOTE: Really, guys of  Security By Default  blog published us (my good friend Roi Mallo and me) two articles about how to develop modules for Metasploit framework, another two are coming.  ;) During my project, among others, I developed a Metasploit module which can flood SIP protocol with common frames (INVITE, OPTIONS, REGISTER, BYE), I wrote it at Quobis (nice job ;) in order to use it for some private tests because actual software didn´t fit our needs, so we are going to probe how is the behavior of different GPL VoIP servers against this kind of attacks: - Asterisk: I think it needs no introduction, the famous softswitch/PBX software. - Freeswitch: It´s a newer soft...
Read more

SIP extension enumeration in Bluebox-ng

There are some well known SIP extension enumeration vulnerabilities in different VoIP servers, specially in Asterisk. This brute-force vector is based on the study of the authentication responses of the target server. Sometimes its replies are different in the case that the client uses a valid extension, so it's easy to discover them. This vector is normally classified as a low security risk. Moreover we're moving towards a federated SIP environment , in which the extension is the public email address of the user. But it's still important in some cases: To guide next steps during a penetration test. In example, you can use the discovered extension to reduce the number of attempts in the phase of SIP extensión brute-force. Some RCE (Remote Code Execution) exploits need a valid extension to work. After a little research, these are the known vulns: CVE-2009-3727 : It's quite old and it's practically not present in real environments. It's still not imple...
Read more