IPS (7.0 (7) E4) on ASA-SSM-10 block DNS without alerts

Hi all

I have the IPS module:

Build version: 1.1 - 7, 0000 E4

ASA 5500 Series Security Services Module-10

Update of the signature S652.0 2012-06-20

Journal of the ASDM inferred events:

4 June 26, 2012 18:21:47 193.227.240.38 53 IPS 65347 sd-out asked to drop the UDP packet from outside:193.227.240.38/53 to dmz1:sd - outside/65347

But the IPS not deducted from alerts - it does not explain why blocking these packets. DNS requests cannot just one network.

! ------------------------------

! Current configuration last modified Tue Jun 26 18:01:58 2012

! ------------------------------

! Version 7.0(7)

! Host:

!     Realm Keys          key1.0

! Signature Definition:

!     Signature Update    S652.0   2012-06-20

! ------------------------------

service interface

exit

! ------------------------------

service authentication

exit

! ------------------------------

service event-action-rules rules0

filters edit PROXY

attacker-address-range 192.168.72.7

actions-to-remove deny-attacker-inline|deny-packet-inline

os-relevance relevant|not-relevant|unknown

exit

filters edit Q00000

signature-id-range 5684

attacker-address-range 95.190.8.0-95.190.8.255

actions-to-remove deny-attacker-inline|deny-packet-inline

os-relevance relevant|not-relevant|unknown

exit

filters edit Q00001

signature-id-range 5684

victim-address-range 95.190.8.0-95.190.8.255

actions-to-remove deny-attacker-inline|deny-packet-inline

os-relevance relevant|not-relevant|unknown

exit

filters edit USERS

signature-id-range 1102,5237,2152,5684,2100,5581,3030,6061,3030,11020,5403,5474,20020,60000-60100

attacker-address-range 192.168.0.0-192.168.255.255

actions-to-remove deny-attacker-inline|deny-packet-inline

os-relevance relevant|not-relevant|unknown

exit

filters edit USERS2

signature-id-range 5575-5591,2151,21619,2150-2151

attacker-address-range 192.168.0.0-192.168.255.255

victim-address-range 192.168.0.0-192.168.255.255

actions-to-remove deny-attacker-inline|deny-packet-inline

os-relevance relevant|not-relevant|unknown

exit

filters move PROXY begin

filters move USERS after PROXY

filters move Q00000 after USERS

filters move Q00001 after Q00000

filters move USERS2 after Q00001

general

global-deny-timeout 14400

exit

target-value low target-address 192.168.0.0-192.168.255.255

target-value medium target-address 192.168.1.0-192.168.1.255,192.168.64.0-192.168.64.255,192.168.3.0-192.168.3.49,192.168.65.128-192.168.65.255

target-value high target-address 192.168.72.2-192.168.72.254,192.168.66.0-192.168.67.255,192.168.2.0-192.168.2.255

target-value mission-critical target-address 192.168.65.0-192.168.65.127

os-identification

calc-arr-for-ip-range 192.168.0.0-192.168.255.255

exit

exit

! ------------------------------

service host

network-settings

host-ip 192.168.64.194/24,192.168.64.1

host-name gw1-ips

telnet-option disabled

access-list 192.168.0.0/16

dns-primary-server enabled

address 192.168.66.2

exit

dns-secondary-server enabled

address 192.168.72.19

exit

dns-tertiary-server enabled

address 192.168.72.20

exit

exit

time-zone-settings

offset 360

standard-time-zone-name GMT+06:00

exit

ntp-option enabled-ntp-unauthenticated

ntp-server 192.168.64.1

exit

summertime-option disabled

auto-upgrade

cisco-server enabled

schedule-option calendar-schedule

times-of-day 04:20:00

days-of-week sunday

days-of-week tuesday

days-of-week thursday

days-of-week saturday

exit

user-name dimaonline

cisco-url https://198.133.219.25/cgi-bin/front.x/ida/locator/locator.pl

exit

exit

exit

! ------------------------------

service logger

exit

! ------------------------------

service network-access

general

enable-acl-logging true

never-block-networks 192.168.0.0/16

exit

exit

! ------------------------------

service signature-definition sig0

signatures 60000 0

alert-severity low

sig-fidelity-rating 50

sig-description

sig-name XPress Administrator Service

sig-string-info Access to Administrator Service

sig-comment External user open Admin

sig-creation-date 20120622

exit

engine service-http

max-field-sizes

specify-max-uri-field-length no

exit

regex

specify-uri-regex yes

uri-regex [Aa]dministrator[Ss]ervice[.]asmx

exit

exit

service-ports 80

exit

event-counter

event-count 1

event-count-key Axxx

specify-alert-interval no

exit

alert-frequency

summary-mode summarize

summary-interval 15

summary-key Axxx

specify-global-summary-threshold no

exit

exit

vulnerable-os windows-nt-2k-xp

specify-mars-category yes

mars-category Info/Misc/Login

exit

exit

signatures 60000 1

alert-severity low

sig-fidelity-rating 50

sig-description

sig-name Xpress Bridge

sig-string-info Service URL

sig-comment External Access to bridge

sig-creation-date 20120625

exit

engine service-http

regex

specify-uri-regex yes

uri-regex [Bb]ridge[/][Ss]ervice[.]asmx

exit

exit

service-ports 80

exit

event-counter

event-count 1

event-count-key Axxx

specify-alert-interval no

exit

alert-frequency

summary-mode summarize

summary-interval 15

summary-key Axxx

specify-global-summary-threshold no

exit

exit

status

enabled true

exit

specify-mars-category yes

mars-category Info/Misc/Login

exit

exit

signatures 60001 0

alert-severity high

sig-fidelity-rating 90

sig-description

sig-name FreePBX Display Extentions

sig-string-info Acces to Extentions settings

sig-comment Weak Password Detection

sig-creation-date 20120622

exit

engine service-http

event-action produce-alert|deny-attacker-inline

regex

specify-uri-regex yes

uri-regex [/]admin[/]config[.]php

exit

specify-arg-name-regex yes

arg-name-regex display

specify-arg-value-regex yes

arg-value-regex (extensions)|(trunks)

exit

exit

exit

service-ports 80

exit

event-counter

event-count 1

event-count-key Axxx

specify-alert-interval no

exit

alert-frequency

summary-mode summarize

summary-interval 15

summary-key Axxx

specify-global-summary-threshold no

exit

exit

exit

exit

! ------------------------------

service ssh-known-hosts

exit

! ------------------------------

service trusted-certificates

exit

! ------------------------------

service web-server

enable-tls false

port 80

exit

! ------------------------------

service anomaly-detection ad0

internal-zone

enabled true

ip-address-range 192.168.0.0-192.168.255.255

tcp

enabled true

exit

udp

enabled true

exit

other

enabled true

exit

exit

illegal-zone

enabled false

tcp

enabled false

exit

udp

enabled false

exit

other

enabled false

exit

exit

ignore

source-ip-address-range 192.168.0.0-192.168.255.255

exit

exit

! ------------------------------

service external-product-interface

exit

! ------------------------------

service health-monitor

signature-update-policy

enable false

exit

license-expiration-policy

enable false

exit

event-retrieval-policy

enable false

exit

exit

! ------------------------------

service global-correlation

exit

! ------------------------------

service aaa

exit

! ------------------------------

service analysis-engine

virtual-sensor vs0

physical-interface GigabitEthernet0/1

exit

exit

I confirmed with the Ironport team that this IP is a bad host in sensorbase. This is the reason for the traffic of this host being removed. There could be several reasons for this subnet to the list, for example, it could be part of a controlled host known by spammers. You must reach out to the development team for a confirmation however.

Tags: Cisco Security

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