full-disclosure - bind-9.8.1 remote code exec exploit?

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Date: Sat, 29 Oct 2011 16:34:46 +0300
From: nix@...roxylists.com
To: full-disclosure@...ts.grok.org.uk
Subject: bind-9.8.1 remote code exec exploit?

Hello list.

I've source compile of BIND 9.8.1 on the server.

I've been investigating weird iptables messages as follows:

Oct 29 14:53:13 NIX kernel: IN= OUT=eth0 SRC=MY_SERVER_IP DST=62.80.128.29
LEN=114 TOS=0x00 PREC=0x00 TTL=64 ID=31795 PROTO=UDP SPT=53 DPT=5060
LEN=94

I received a message from my ISP abuse that my server is scanning SIP port
5060 and I set the firewall rule to deny/log all UDP connections out of
the box to port 5060 to get timestamps for further investigation. This
happened before I set the firewall rule.

/var/log/named.log

05-Oct-2011 06:05:58.093 client: warning: client 81.25.53.2#5060: error
sending response: host unreachable
07-Oct-2011 13:14:38.739 client: warning: client 221.210.153.6#5060: error
sending response: host unreachable
08-Oct-2011 00:43:22.881 client: warning: client 212.59.18.8#5060: error
sending response: host unreachable
08-Oct-2011 13:42:58.943 client: warning: client 202.43.160.50#5060: error
sending response: host unreachable
12-Oct-2011 10:26:20.586 client: warning: client 213.77.43.115#5060: error
sending response: host unreachable
14-Oct-2011 15:42:12.676 client: warning: client 193.210.19.19#5060: error
sending response: host unreachable
15-Oct-2011 16:26:16.573 client: warning: client 202.44.204.36#5060: error
sending response: host unreachable
16-Oct-2011 20:52:44.570 client: warning: client 200.63.56.5#5060: error
sending response: host unreachable
17-Oct-2011 01:48:49.617 client: warning: client 84.22.23.4#5060: error
sending response: host unreachable
23-Oct-2011 12:34:26.255 client: warning: client 208.69.35.15#5060: error
sending response: host unreachable
25-Oct-2011 01:50:17.382 client: warning: client 84.88.226.10#5060: error
sending response: host unreachable
25-Oct-2011 15:23:51.384 client: warning: client 195.222.32.20#5060: error
sending response: host unreachable
29-Oct-2011 14:53:13.208 client: warning: client 62.80.128.29#5060: error
sending response: host unreachable

Timestamps matches exactly to kernel's firewall log. Every time BIND error
log has the above entry, the box tries to scan for SIP port 5060.

Is it possible to scan ports through BIND or exec code by sending a
specially crafted request?

PS. I have been tracking this issue for a week and no other timestamps
matches exactly to this isssue. I have currently grsec' exec logging on
and hoping this issue occurs soon so I can see will it execute extra code
under the user 'bind'.

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