Cisco Firewall :: ASA 5500 - HTTP Inspection Spoof Server String
Aug 11, 2011
I'm looking fot a way to do static URL blocking with ASA and when the URL is blocked present a "Web Page" to the user saying that it's been blocked.
So, i was wondering if i can use the http parameter "spoof server string" to replace the original URL sent by the user for another URL that points to an internal web server holding a basic page saying "Your URL request has been blocked".
The point is to have a way to tell users that the page they are trying to browse is blocked by a policy.
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May 9, 2012
I am testing out some inspection options on an ASA 5505, and I am running into a situation in which applying a http inspection is dropping all outbound http traffic. I get a "protocol violation" error in the logs.
Here is the setup: I'm not sure why the web traffic is getting dropped.
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
[Code].....
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May 3, 2011
let me know how to enable HTTP inspection in ASA 5505 through ASDM.
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Mar 8, 2011
I Have a 2821 Router with a IOS Version 12.4(13r)T. When i enabled the firewall, my download speed slows down to 10-20kbps (the normal is 5-6 Mbps).
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Jan 12, 2011
Im trying to configure HTTP Inpsection with regex matching on a ASA 5505 (8.2) so that I can deny all websites apart from google and yahoo. And also enclude host 192.168.1.2 from this inspection. I have been through a number of examples and the syntax below appears correct but appears not to work. The logs report only that traffic has been dropped by the inspection policy.
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Jun 20, 2011
I just upgraded my ASA 5585 cluster from 8.2 to 8.4. I also upgraded the asdm .bin from 6.35 to 6.43. after rebooter the cluster, I try to access it with ASDM installed on my computer but it blocked at 17%.I tried to access [URL] but I just an error (with IE & FF) [code] What did I miss in the ocnfiguration ? I precise that I never used the http page, I already had the ASDM installed from another ASA.
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Jun 2, 2013
I'm receiving an error when trying to access a web server behind from one subinterface to another subinterface on an ASA access the public IP. I'm getting the following:
Global Static NAT Deny IP spoof from (61.X.X.X) to 201.X.X.X on interface Outside
Traffic dies at the firewall stating that the traffic is spoofed from the Global address (61.) to the static (201.) address. Both bound to the outside interface. When I create a static NAT on the firewall there is no problem; however when I'm patting against the firewall to the public IP I get the denies.
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Jun 17, 2012
I'm trying to attach tacacs server (ACS Version 5.2) in server group on ASA 5520 (Version 8.4). When I test connection in ASDM (Version 6.4) between ASA and ACS it fails. The log message on ASA is:
%ASA-2-106016: Deny IP spoof from (10.8.27.126) to 10.8.48.10 on interface inside.
Packet-tracer from ASA is:
InternetASA# packet-tracer input inside tcp 10.8.27.126 4444 10.8.48.10 49
Phase: 1
Type: CAPTURE
Subtype:
Result: ALLOW
Config:
Additional Information:
MAC Access list
[code]....
What access-list or implicit rule may be the reason of denying these packets?
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Feb 16, 2011
My web server sits behind an ASA 5500.When I access the web site from outside, it works fine. When I try and access it from the server itself, I get"Internet Explorer cannot display the webpage" error. I can access other web sites, such as Yahoo.com, Google.com, etc. I have rules setup to restrict/enable incoming traffic, but I don't have any rules setup to "loop back".
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May 7, 2012
I have one server-A(windows 2008) installed one application called"host front" which gives athentication to connect Linux(mainframe console) server (SERVER B).These 2 servers are bihind the firewall.If one internal user who has the athentication to logine server-B ,tried to login server A,will get the" username and password"screen and once they enter the username and password ,will get the server-B screen.But if somebody try to connet via MPLS(we need to test MPLS site customers) from outside via ASA 5540 ,to server-A will get the "username password" screen and once enter the credentials, after 1 minitue will get error"http server faild to send datas to the server" and will not move to server -B screen.
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Oct 26, 2011
We use multiple ASA 5500/5580 cluster systems running 8.3 software versions.Actually we send all our FW syslog data to a SIEM appliance in a DMZ on a remote firewall (non-asa). Recently we suffered a strange incident while implementing a new SIEM collection station now situated in a dmz that is located on one of the ASA contexts. We redirected the syslog streams to the new client for one of the contexts on the ASA cluster that holds the new SIEM agent DMZ..since we did this and redirected the syslog we see double traffic and spoofing errors on that context
a/ the ASA keeps sending out the syslog traffic to the OLD SIEM agent server ip (there is however no trace of its ip in the config)
b/ the traffic leaving the interconnection interface towards the OLD SIEM agent gets a SPOOFING error on the traffic
c/ strangely the data gets also correctly forwarded to the new SIEM collection stations.
We started out with redirecting traffic on only one of the 5 contexts to the new environment and kept logging the others to the old system.I finally got out of the issue by reconfiguring al the other contexts to forward their syslog towards the same new server , since that moment we no longer have the double logging and spoofing error , all syslog traffic goes correctly to the new SIEM agent. It looked like some remenants of the old syslog config remainded on the asa event after deleting and introducing a new config line (we used the asdm to execute the action) as said either it kept the old config or it looked in the other context and "decided" to keep sending to the old server also mentioned in that syslog can find the behaviour in any buglists either way.
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Aug 5, 2008
I have an ASA 5505 that I am using to connect my contractors to via an inside interface, the outside interface is my private LAN. I have setup on our corporate Proxy server to allow traffic from my outside interface of my ASA to go to the internet without credentials BUT log internet activity. The question is I want to know if the ASA can send that http & https traffic to my proxy server and all other traffic to my default route? I want to be able to send all internet traffic to my proxy server. This will avoid me asking the contractors to place proxy credentials in their browsers.
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Jan 15, 2012
Recently i have upgraded the IOS of ASA5550 (in HA mode) to 8.4.2 from 8.0.5, after OS upgrade we found that the syslog from thses firewalls are not getting captured/transfered to centralised syslog server. The server is reachable from the firewalls.
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Aug 2, 2011
We had a problem with SMTP inspection dropping some regular emails (Cisco 2901 IOS 15.0). The original configuration.
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Jun 21, 2011
We had a problem with SMTP inspection dropping some regular emails (Cisco 2901 IOS 15.0).Incoming mails are going thru Spam and Virus Blocker so that bypassing SMTP inspection is not security issue in this case.
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May 25, 2011
I have multiple customers and servers behind my ASA5510s. After moving a new customer with an FTP server behind the firewalls, they immediatly had issues with customers connecting to their FTP server. I had the default inspection rules running regarding FTP. After removing the "inspect ftp" from the global policy their issues went away. Since this is a larger customer I can't force them to change their server, I need to accomodate and fix this on the firewall. I left the "inspect ftp" command out and there have been sporatic issues from other customers, unable to connect to outside FTP servers from the terminal servers and timeouts and disconnects to our own FTP servers.
This is what I "think" is the solution.. I added a second inspection policy after the default one and only added "inspect ftp" to it. Then I used the "exclude" option to exclude the new customer. That new customer is fine and things are better, but still not working right. Does the following config accomplish what I want?? Does the exclude ACL get what I need or do I need an "include" or permit statement in that ACL?
object-group network DM_INLINE_NETWORK_10 network-object 172.24.X.0 255.255.255.0
object-group service DM_INLINE_TCP_1 tcp port-object eq ftp port-object eq ftp-data
access-list global_mpc extended deny tcp any object-group DM_INLINE_TCP_1 object-group DM_INLINE_NETWORK_10(code)
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Jan 29, 2013
ASA 5520 running 8.4.5:We had an issue with a remote SMTP connection getting screwed up as a result of ESMPT inspect.It took me 3 hours of troubleshooting the SMTP connection before finally figuring out that the firewall was the culprit. What really through me off was that I saw nothing in the ASA logs (warning and above) that showed packets were being dropped. I'm probably crazy but I thought I remembered seeing entries in the log when packets were dropped due to a type of inspection (specifically, I remember entries in the log saying something to the effect of packet dropped due to ESMPT inspect, packet too big). My quesiton to Cisco TAC was: Is there a simple way to have the log give a warning every time a packet is dropped due to any inspection rule, just like we can see any drops due to ACLs? So far the only answer has been a complex list of log changes to allow debugging and notifications of certain events. This isn't something I want to roll out to all my ASAs.
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Jun 13, 2012
I am using the Cisco ASA5510 for my Telepresent infarstructure. I have a problem with Encrypted SIP calling for call in/out.
Is there is a way to disable the TLS inspection for Cisco ASA5510?
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Aug 9, 2012
We have several customers running ASA 8.4x code and all seem to be plagued with the ESMTP inspection bug CSCtr92976.I have tested this in the lab with an ASA 5505 running 8.4(1), 8.4(2) and 8.4(4)1 & 8.4(4)3 and the behaviour is always the same. I have an Exchange 2007 server and I can see in the logs the following messages:
2012-08-10T13:04:37.331Z,EXCHANGEDefault EXCHANGE,08CF3610468A42D7,3,192.168.102.28:25,192.168.250.26:52756,<,XXXX XXXXXXXXXXXXXXX,
2012-08-10T13:04:42.345Z,EXCHANGEDefault EXCHANGE,08CF3610468A42D7,4,192.168.102.28:25,192.168.250.26:52756,>,500 5.3.3 Unrecognizedcommand, 2012-08-10T13:05:20.506Z,EXCHANGEDefault EXCHANGE,08CF3610468A42D7,5,192.168.102.28:25,192.168.250.26:52756,<,XXX,
This is with the default ESMTP inspection enabled. I have also created a custom ESMTP inspection policy that does nothing but log and the behaviour is still the same. Sometimes traffic will pass but most of the time it won't. The workaround is to just disable the ESMTP inspection.
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Sep 21, 2011
By default ASA applies DNS packet inspection with a default (maximum) packet size of 512bytes as recommended by RFC 1035, anything above is dropped.
I have a customer that is trying to use larger packet sizes due to extension mechanisms for DNS defined in RFC2671.
My question is , is it safe to increase the default packet size in the DNS inspection thus applied globally for all DNS traffic, or should / can we apply a policy that applies only to this specific customer ?
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May 9, 2012
I was under the impression that all Cisco ASA firewalls shipped with a default inspection policy.
Example
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
[Code]......
can I build this myself? Why is it missing (I have two other ASA 5505s here that also do not have it). What would I do to rebuild it?
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Jan 10, 2011
On FWSM (running version 4.1 in my case) the default global policy uses the following class map:class-map inspection_default match default-inspection-traffic
What "default-inspection-traffic" includes? Is it all traffic? If so, do I really want all my traffic to go through the inspection engine? I would imagine this would have a performance impact on traffic that is not part of the protocols being inspected.
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Jul 16, 2009
I have an issue with Cisco ASA 5520, The summary is below!
Packet # 1 on inside capture the Call-ID was: Call-ID: 2a54f680-
a5d1de2a-160c-164070a@10.7.100.1
Packet # 1 on outside interface the Call-ID was: Call-ID: 2a54f680-
a5d1de2a-160c-164070a@149.5.33.44 --- this bcz of the inspection.
Packet # 2 on outside capture the Call-ID was: Call-ID: 2a54f680-
a5d1de2a-160c-164070a@149.5.33.44
Packet # 2 on inside capture the Call-ID stay: Call-ID: 2a54f680-
a5d1de2a-160c-164070a@149.5.33.44 --- this is the problem.
(This suppose to be Call-ID: 2a54f680-a5d1de2a-160c-164070a@10.7.100.1)The inspection should change the Call-ID for the incoming packet as it did with the outgoing packet. Whenever, the CM receive the trying message with different Call-ID it considered as new session and it keep sending invitation messages for the SIP provider.NAT is enabled.
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Jan 18, 2012
I am having issues with PXE boot images for PCs cannot be loaded from remotely.The diagnosis revealed that SunRPC & TFTP were being inspected by ASA causing drop of packets.So I excluded these two inspections for the particular server behind the firewall. It seem to resolve the issue for instance but it crawled back again.
Is there a way that the inspection can be turned off for that particular server at the IP level?
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Dec 31, 2011
I have a branch office set up were all traffic goes back to the core, iincluding internet acces.
It has been working fine for a year, but recently I have started to see the firewalls Asa 5505 closing the connection and stopping the phone from answering the calls.
I have skinny inspection turned on all my branch offices, but had to turn it off at the one site to get one of my phones to registered.
I haven't made any changes to the network that would trigger this issue, such as upgrading phone firmware.
My firewall is configured for default deny, other than Skinny (tcp 2000), do I need Skinny inspection to be turned on?
It's turned on my 5 other branches.How can I debug why the skinny inspection is closing the connection?As a separate note this phone is part of a pool of phones that shares a common DN, would this be causing the issue?
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Jun 5, 2012
I need to allow traffic between webserver in dmz and mssql (Microsoft SQL Server 2008).MSSQL use dynamic port (now it is 63796) and this cannot be changed.
Basically, I can allow such traffic using next configuration:access-list dmz extended permit tcp host 1.2.3.4 host 5.6.7.8 eq 1433access-list dmz extended permit udp host 1.2.3.4 host 5.6.7.8 eq 1434 access-list dmz extended permit tcp host 1.2.3.4 host 5.6.7.8 eq 63796
But, I would like to add mssql inspection and I did the next:
class-map class_sqlnetmatch port tcp eq 1433policy-map global_policyclass inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect ip-options inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp class class_sqlnet inspect sqlnet service-policy global_policy global
[Code] ..........
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May 6, 2011
I can't find any specific information on the implementation of packet inspection in a zone based policy firewall. In other words, is there a specification or even just a set of values that define the default inspection parameters for all protocols? With DPI I can manage 'some' of the inspection capabilities but I have some fairly rigorous and specific requirements to meet and I need to validate that the IOS ZBFW will meet those requirements. Specifically, I'm interested in HTTP, DNS, and ICMP but all other protocols would be useful as well.I'm working with basic routers; 871's, 2811's, 1841's, etc. The IOS in use in most cases is adventerprisek9-mz.151-3.T.
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May 25, 2011
I currently have the default inspection engine configured in my firewall to inspect http traffic. I noticed that the ASA will drop packets when visting legitimate websites. I've tried googling for a workaround but have been unsucsselful. How can I exclude some websites or IP's from being affected by the inspection engine?
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Sep 7, 2011
verify if the ASA 5520 CSC module way of applying security policy (http, smtp, pop3, etc.) is per network/subnet or group of users? Based on my understanding through reading, web and email protection profile/config is global. It will be the same to every network user that is redirected via service-policy config on the ASA.
Scenario: I have two VLAN, guest and employee. Of course guest and employee have different web filter profile. Can i configure it such that guest web-filter profile is not just strict while employee's access is limited only to productive internet sites.
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Jun 6, 2011
I have problem with icmp traceroute configuration. When I enabling icmp error inspection in global policy, my traceroute results through ASA 8.2.4 looks like this: My traceroute [v0.75]
icmp inspection and ttl decrement on ASA is enabled. Also I configured ACL on outside interface to permit ICMP completely.
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Jan 14, 2013
I have a client that is running an ASA5512-X. When I initially installed it, they were having issues sending out emails. I disabled ESMTP inspection and thought it resolved the issue. Recently, they upgraded to Exchange 2010 and are still having an issue with some emails getting hung up in the queue. If I watch the ASA when they try to telnet to the external mail servers that do not work, they get a SYN timeout.
I am not sure why this would happen since ESMTP is disabled. They are running 8.6(1) on the ASA.
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May 10, 2012
i have removed the icmp inspection from my default policy-map in my ASA 5520,now i could not able to ping to 4.2.2.2 from my LAN even though i have configured an ICMP Access-list in my asa like ,but I can't ping 4.2.2.2 for testing the Internet connectivity,what shall i do to allow only my self as admin to ping outside?
-icmp permit host 192.168.60.60 echo
-icmp permit host 192.168.60.60 echo-reply
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Jun 13, 2011
I am having an issue with an ASA 5510, running 8.4(1) code, causing outbound mail to remain in the SMTP server queue (Exchange 2007). This only happens with some remote mail servers. The connection usually ends with the remote server eventually sending a TCP reset.
I've taken multiple inside and outside packet traces.Other trace's contain either X's preceding various sections of the stream content or all X's in the content. The X's only appear when inspection is enabled.
Disabling inspection is the only thing that seems to allow mail to flow. I find this curious because I'm running this same ESMTP policy on other ASA's. However, they are on 8.3 code.
Most everything I find when searching on this subject says to disable ESMTP inspection. [code]
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