[SR-Users] bad cseq attack

[Juha Heinanen]

i have noticed lots of these kind of attacks in my syslog:

/var/log/syslog.1:Aug 21 04:23:46 host /usr/sbin/sip-proxy[13490]: ERROR: <core> [parser/parse_cseq.c:95]: parse_cseq(): ERROR: CSeq EoL expected
/var/log/syslog.1:Aug 21 04:23:46 host /usr/sbin/sip-proxy[13490]: ERROR: <core> [parser/parse_cseq.c:98]: parse_cseq(): ERROR: parse_cseq: bad cseq
/var/log/syslog.1:Aug 21 04:23:46 host /usr/sbin/sip-proxy[13490]: ERROR: <core> [parser/msg_parser.c:161]: get_hdr_field(): ERROR: get_hdr_field: bad cseq

in order to be able to fail2ban the attacker, source ip address should
appear in syslog message.

is there a way to catch sip request syntax errors in config file so that
appropriate syslog message could be generated?

-- juha