[asterisk-bugs] [JIRA] Commented: (ASTERISK-20506) With alwaysauthreject=yes AND allowguest=no Asterisk fails to report Attacker's IP Address

[MBH (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=197937#comment-197937 ] 

MBH commented on ASTERISK-20506:
--------------------------------

"but please be informed, that at least on systems I'm running, a lot of attacks are done with spoofed source IP addresses"

If that is the case, and I'm sure it's correct, then how is the issue resolved in Asterisk 10? Also, Asterisk 8 is supposedly Long Term Support. Is the reason for not fixing this, because it may require an overhaul of existing functions?

Someone in asterisk IRC channel suggested a simpler option than iptables throttling: Accept anonymous calls, generate a special event, ban them. This works if you do not accept anonymous calls by default, otherwise, you're back to iptables voodoo.

> With alwaysauthreject=yes AND allowguest=no Asterisk fails to report Attacker's IP Address
> ------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-20506
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20506
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/General
>    Affects Versions: 1.8.15.1
>         Environment: CentOS release 5.8 (Final), Kernel 2.6.18-308.8.2.el5.028stab101.1, 32-bit, running on an OpenVZ VPS.
>            Reporter: MBH
>
> My Asterisk box is being brute forced and I'm getting messages in the logs referencing my box's IP instead of the attacker's:
> [2012-10-03 03:49:45] NOTICE[28161]: chan_sip.c:22723 handle_request_invite: Sending fake auth rejection for device 5550000<sip:5550000 at AsteriskIP>;tag=396cbe1b
> The notice message is not logging the attacker IP at all, thus cannot be blocked using fail2ban.
> The same is mentioned here: http://lists.digium.com/pipermail/asterisk-users/2011-March/260377.html and here http://forums.digium.com/viewtopic.php?t=78988
> I'm using type=peer, alwaysauthreject=yes, allowguest=no

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