I really think that people give way too much importance to firewalls, specially stateless ones, blocking ports isn't going to do much for you unless you are trying to hide vulnerable services behind it.
They used the extension 1000 to make the calls so I would say: activate log-auth-failures on your profile, setup a fail2ban and get stronger passwords.
If you want to go further you can use a stateful firewall limiting connections and setup a IDS(recommend snort)
Hey All,
I just got an email from Frontier that there were several attempts to
make international calls.
I checked the log file and verified that somehow someone was able to get
access to FS from the internet.
here is a sample of the log
[m [36m2012-09-23 16:30:29.916821 [NOTICE] switch_channel.c:941 New
Channel sofia/internal/1000@50.47.85.167
[af778857-0188-4ed2-a82a-94ae749a02cb]
[m [32m2012-09-23 16:30:29.916821 [INFO] mod_dialplan_xml.c:485
Processing 1000 <1000>->01137168521352 in context default
[m [36m2012-09-23 16:30:29.936831 [NOTICE] switch_channel.c:941 New
Channel sofia/internal/01137168521352@192.168.1.5:5061
[d1243a78-c464-45fa-9215-e7b85e1221fc]
[m [36m2012-09-23 16:30:29.956842 [NOTICE] sofia.c:6132 Ring-Ready
sofia/internal/01137168521352@192.168.1.5:5061!
[m [36m2012-09-23 16:30:29.956842 [NOTICE] mod_sofia.c:2572 Ring-Ready
sofia/internal/1000@50.47.85.167!
[m [36m2012-09-23 16:30:29.956842 [NOTICE] switch_ivr_originate.c:519
Ring Ready sofia/internal/1000@50.47.85.167!
[m [36m2012-09-23 16:30:32.936826 [NOTICE] sofia.c:6777 Channel
[sofia/internal/01137168521352@192.168.1.5:5061] has been answered
[m [36m2012-09-23 16:30:32.956825 [NOTICE] sofia_glue.c:4176 Pre-Answer
sofia/internal/1000@50.47.85.167!
[m [36m2012-09-23 16:30:32.956825 [NOTICE] switch_ivr_originate.c:3303
Channel [sofia/internal/1000@50.47.85.167] has been answered
[m [36m2012-09-23 16:30:52.356865 [N [m [36m2012-09-23 16:30:29.916821
[NOTICE] switch_channel.c:941 New Channel
sofia/internal/1000@50.47.85.167 [af778857-0188-4ed2-a82a-94ae749a02cb]
[m [32m2012-09-23 16:30:29.916821 [INFO] mod_dialplan_xml.c:485
Processing 1000 <1000>->01137168521352 in context default
[m [36m2012-09-23 16:30:29.936831 [NOTICE] switch_channel.c:941 New
Channel sofia/internal/01137168521352@192.168.1.5:5061
[d1243a78-c464-45fa-9215-e7b85e1221fc]
[m [36m2012-09-23 16:30:29.956842 [NOTICE] sofia.c:6132 Ring-Ready
sofia/internal/01137168521352@192.168.1.5:5061!
[m [36m2012-09-23 16:30:29.956842 [NOTICE] mod_sofia.c:2572 Ring-Ready
sofia/internal/1000@50.47.85.167!
[m [36m2012-09-23 16:30:29.956842 [NOTICE] switch_ivr_originate.c:519
Ring Ready sofia/internal/1000@50.47.85.167!
[m [36m2012-09-23 16:30:32.936826 [NOTICE] sofia.c:6777 Channel
[sofia/internal/01137168521352@192.168.1.5:5061] has been answered
[m [36m2012-09-23 16:30:32.956825 [NOTICE] sofia_glue.c:4176 Pre-Answer
sofia/internal/1000@50.47.85.167!
[m [36m2012-09-23 16:30:32.956825 [NOTICE] switch_ivr_originate.c:3303
Channel [sofia/internal/1000@50.47.85.167] has been answered
[m [36m2012-09-23 16:30:52.356865 [NOTICE] switch_channel.c:941 New
Channel sofia/internal/1000@50.47.85.167
[4576bc76-144a-4f6f-8915-871b511c374d]
[m [32m2012-09-23 16:30:52.376830 [INFO] mod_dialplan_xml.c:485
Processing 1000 <1000>->01137168905352 in context defaultOTICE]
switch_channel.c:941 New Channel sofia/internal/1000@50.47.85.167
[4576bc76-144a-4f6f-8915-871b511c374d]
[m [32m2012-09-23 16:30:52.376830 [INFO] mod_dialplan_xml.c:485
Processing 1000 <1000>->01137168905352 in context default
At this point I'm at a loss how this is happening as I have multiple
firewalls in place that limit port access.
Can someone provide a few pointers on how to better secure FS running on
Linux systems?
thanks
--
-
-
- Best Regards,
-
- Todd Bailey
-
-
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