Cisco Firewall ::ASA 5550 - SHA1 Signature Algorithm On FWSM
Mar 11, 2013
I would like to ask whether SHA1 signature algorithm is available for FWSM. We use FWSM code version 3.2(22) in our production network where only MD5 signature algorithm is available. There is a need to upgrade to stronger algorithm SHA1. From my experience I know that this is possible on ASA firewalls running on 8.4. codes. Certificates generated on code 8.4. automatically use SHA1 with RSA Encryption.
Is it possible to have Signature algorithm SHA1 on FWSM? If so, in which code version?
hba-pf-a# sh crypto ca cert
Certificate
Status: Available
Certificate Serial Number: caf44050
Certificate Usage: General Purpose
Public Key Type: RSA (2048 bits)
[Code] .....
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Oct 8, 2012
we have two ASA5520-AIP40-K8 in our office and we purchase IPS service for one only, can we also update the signature of second device before purchasing additional IPS Services for second unit
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Oct 18, 2011
I am support one client for, whom falls under Security scans mandatory for new implementation of ASA 5520 device. The client uses Nessus Scan and the test results are attached.The Nessus scanner hit on 1 Medium vulnerabilities.
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Nov 22, 2006
one of my router are scanned by Foundstone and get an alert :
""The SSH2 protocol specification requires that a SSH2 server support the diffie-hellman-group1-sha1 key exchange algorithm. This key exchange algorithm is considered strong, but faces a potential weakness in that the same prime number is used for all key exchanges."
SO wanna check if cisco SSH2 can support the diffie-hellman-exchange-group-sha1? If yes, which IOS version required?
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May 3, 2011
We have 2 FWSM modules in each 6500 switches. 1st module is having 04 firewall vlan groups with 18 vlan interfaces in a single context firewall. All are working fine with no issues. Recently we create one more vlan on MFSC and add into the same firewall module. However newly created vlan inside the FW is not able to communicate with outside and also outside users not able to reach newly created subnet. But within the firewall zones (other interfaces) it can communicate. Once we did packet capture we noticed that its hitting firewall outside interface only and when we ping we got TTL expired error. we have default routes to outside and there's no any route inside as new segment is within the firewall (no any hop).
I guess there's no limitation on number of vlans that we can assign on one firewall eventhough there is a limitation for number of vlan-group which is 16 max (but we are within that limit).
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Mar 3, 2011
i two 5550 firewall set up for redundance purpose . in failover we define two different ip add one for primary and one for secondary .interface Ethernet0/0 nameif outside security-level 0 ip address xxxx.0.0.0.1 255.255.255.0 standby xxxx.0.0.2!interface Ethernet1/0 nameif inside security-level 100 ip address 10.0.0.12 255.255.255.0 standby 10.0.0.11.default gateway for host will be 10.0.0.12 (primary fw address) however in case of failover , the secondary fw will be up with ip address that was assigned for primary .in this case the secondary ip add 10.0.0.11 is actually nerver used? similarly do i need to have two public ip address for outside (one for primary and one for secondary ) ? or in case if primary fails the secondary comes onlie and take the ip of primary fw . hence i only need to purchase just one ip address.
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Feb 22, 2013
I have cisco 5550 Firewall, one messages appear in syslog server from Firewall, (warning) i want to stop this message from appearing syslog traps.
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Apr 17, 2011
I am having two ASA 5550 firewall running in active/standby mode. With in last two months our secondary firewall got down automatically 3 times. Firewall is running with IOS version 7.1.2. how to proceed further troubleshooting because there are not any logs on firewall.
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Jun 19, 2012
The router(Cisco 857) appears to be boot, and operate normally.I have tried formating the flash, re-downloading and FTP uploading the image, and also tried the latest image c850-advsecurityk9-mz.124-15.T17.bin, but this warning message persists. [code]
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Mar 14, 2011
Due to network security audit we are interesded in encryption algorithm used for authentication of administrator and operators in Starent Networks ST40 Intelligent Mobile Gateway. To be more clearly, we need to know what type of hash is used for password storing when "showsecrets" command is omitted.
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Jul 12, 2012
We have recently purchased a Cisco ISR 2921, and on its docs it is written that this product has a License for IOS IPS Signature File, but on the product Flash Memory there is no IOS IPS Sig-File. and while i try to download the signature file from Cisco, it fails.
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Oct 24, 2012
we use LMS 4.2.2 to manage our Cisco devices. At the moment all devices are managed with snmpv2. I´ve picked one Catalyst 2960-24TT-L Version 12.2(25)SEE3 and configured snmpv3
Here´s the output of show snmp user:
User name: ciscoworks
Engine ID: 8000000903000022BD29EF40
storage-type: nonvolatile active
Authentication Protocol: MD5
Privacy Protocol: DES
Group-name: LMS
Now, in LMS under Admin->Network->Device Credentials Settings-> i created a new credential set "snmpv3" with the correct user/password and following settings: AuthPriv (enabled) Auth Algorithm MD5 Privacy Algorithm DES (because the 2960 12.2(25)SEE3 doesn´t support any other alorithm).
I´ve edited the credentials and assigned the new set to that device. Now to test the snmpv3 credentials i´ve started an Device credential verification job an chose snmpv3 only. But every time the job failes with the error
Wrong Privacy Algorithm.
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May 13, 2011
I have ASA5550 ruuning Version 8.3(1) with inside and outside interfaces as below [code] On the inside : I have a server (10.20.10.36) that need to be accessed from an outside host (Y.Y.131.34) , so I have the below NAT/ACL rules. [code] is it right that I have to add two ACL entry for outside host to the NATed IP of the inside server , then again add another ACL entry from the same outside host to the private IP of my inside server o get this communication done?
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Jan 31, 2012
we had just installed our ASA 5550 with IOS 8.0(2) a couple of week ago.
2 interfaces from each slot are being used ie 0/0 for Branch users comming via MPLS cloud , 0/1 for internal LAN users comming form Core Switch & 1/0 for Server farm LAN , 1/1 for Internet (outside)
the first 3 interface are considered inside with sec set at 100 while the 1/1 is outside with sec at 0.
Last night it suddenly started dropping all connections without any warning or any noticible log form the ASDM logging.
the connection drop would happen for 2 - 3 minutes and would work fine for the next 15 minutes or so..
after conencting the console , we found out that the IOS would suddelny go abrupt and show this display ...
TP-ASA(config)# TP-ASA(config)# TP-ASA(config)# Thread Name: Dispatch UnitPage fault: Address not mapped vector 0x0000000e edi 0x24d184b0 esi 0x0000000d ebp 0x1c6ceaf8 esp 0x1c6ceae0 ebx 0x09e965e0 edx
[Code]....
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Oct 4, 2011
I have looked in the books I have (Cisco ASA, PIX and FWSM; ASA 8.0) and googled a good bit but can't seem to find any specific mention of how to do NAT exemption with v8.4. It seems NAT exemption (NAT 0 access-list) was deprecated. Using ASDM, there's no corresponding menu item for this that is obvious.
We have public addresses inside the ASA and want to allow in/outbound connections using these IP's without NAT. The ASA is a 5550.
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Apr 1, 2013
Can any1 tell me wat is the difference between ASA-SM1 and FWSM.
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Apr 10, 2012
I want to upgrade a pair of FWSM in active failover from 4.0(4) to 4.1(8) i just want to double check the process. i have tftp access to the primary at the minute. i cannot access the same tftp server with the standby. do i need flip over to the standby to be able to tftp the image across?
failover activehostname# changeto system
hostname# copy tftp://x.x.x.x/c6svc-fwm-k9.4-1-8.bin flash:image
hostname# copy tftp://x.x.x.x/asdm-622f.bin flash:asdm
hostname# reload
Once i have the images loaded i reload both at the same time?[URL]
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Dec 17, 2011
I am planning for an VSS in Core but firstly I need to upgrade FWSM which is at 3.2 Ver to 4.0.4 (min release) I have checked software dependencies but not sure about Hardware Dependency on Fwsm and Chassis for Eg. Rommon Upgrade on Chassis.
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Jun 26, 2011
I wanna upgrade FWSM Version 3.1(11) to latest 4.x version is this possible or i have to upgrade first to 3.2 and then to 4.x?
Is there any changes in configuration commands that i need to know? The version that 6500 running is s72033-advipservicesk9_wan-mz.122-18.SXF14.bin,an upgrade to 6500 is needed also?And if so what ios version will i put?Also which is the asdm supported version?
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Jan 15, 2012
We recently deployed a FWSM on our 6503-e boxes (w/ sup720). NAT is working (PAT) but the issue I am seeing is private traffic from remote sites is not being allowed through the FW. I was able to get the remote site to ping the FWSM itself (inside address), but no hosts behind it. Maybe an ACL issue? Also when I turn off NAT on the remote end, I can than access everything (We are NATng on both ends). Im a routing guy by nature so I will defer this to the security guys out there.
Topology
Hosts (inside/10.15.25.0/24) > FWSM (outside/public IP) -> Core Router -> MPLS CLOUD -> Core Router (NATng) - > Hosts (192.168.1.0/24)
ACLs applied to inside/outside interface
FWSM# show access-list ATX-ALLOW-IN
access-list ATX-ALLOW-IN; 15 elements
access-list ATX-ALLOW-IN extended permit tcp any any (hitcnt=222)
[Code]....
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Jun 17, 2012
one of our customers wants to update the firmware of a 5508 wlc, but always gets the following error message:
Error Message %UPDATE-3-INV_FILE_SIGN: Error! Invalid image signature!. Image may be corrupt.
but the same image works fine on another 5508.the update was downloaded via a smartnet for the wlc, on which the update works fine. does the customer has to download another image for the second controller, or should the image work on both wlc?
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Sep 22, 2011
if there is a wireless adhoc network and i want to provide the security to the data which i want to transmitt over this network but i dont want to encrypt the whole data but to apply encryption in a part of data which conatins the important information.
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May 21, 2013
I need to understand if ASA 5550 ver 8.2(1) is comptible with IPv6, if not what is the upgrade path to make it IPv6 compatible. The requirement is dual stack of IPv4 and IPv6 should run in the same HA cluster and later will shift IPv6 completely.
The existing infrastructure is equipped with ASA with HA Active/Active mode. The command output for required details are attached here in txt mode.
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Mar 10, 2013
I have Active Standby ASA5550 setup with VPN premium license. A few days back we had a requirement of SSL VPN connection for and we got a temporary from Cisco for same, this license expired and the ASA reverted to it's original license. 3 4 days after this we saw a sudden increase in CPU utilization (upto 90% + -5%) on the ASA during production hours but were not able to figure out the reason, in order to restore the services we failovered the firewall to secondary and everything worked fine. We were suspecting one of the following but there were no logs for any of this
1. The ASA hardware was haivng problem
2. Some client was doing a DoS attack to bring down the ASA (no logs for this as well).
We took a downtime to look further by failovering the ASA back to primary and it worked fine without any issues ruling out the 1st option. We also came across a licesing doc [URL]
Downgrading any license (for example, going from 10 contexts to 2 contexts).
# Note If a temporary license expires, and the permanent license is a downgrade, then you do not need to immediately reload the security appliance; the next time you reload, the permanent license is restored.
As per this doc, sooner or later a restart was required on the ASA. We restarted secondary ASA and everthing was fine but when we restarted the primary ASA by swtiching over to secondary some of the server (not all) in the DMZ stopped working (even ICMP unreachable) and only came back to normal when the primary ASA was restored and working fine (with failover).
The reboot was done by shuting down the physical link between the Core switch and ASA inside individually.
I am not sure what could be the issue that the servers in the DMZ wen unreachable.
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Aug 9, 2010
In my Cisco ASA 5550, I need to set two different syslogs servers, and I need to send the system logs to the first one (only admins login/logout), and the traffic logs and all the rest (informational level) to the second one. Do you know if is it possible or not and, if yes, how to configure it?
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Jun 12, 2011
I would like to work with two ASA's 5550 in HA (Acitve-Standby) like perimetral firewalls and also work with another ASA 5540 but like a SSL VPN Remote Access to end users.Which will be the best topology to this scenary?. Perhaps i need to put the ASA 5540 SSL VPN together with the ASA's in HA directly in a port.
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Apr 26, 2011
I am using an ASA5550 for a complex secure network that has at least six "outside" networks. Each "outside" network is assigned to a specific port each set at level "0". I also have a DMZ, set to level "50". I am having difficulty with passing traffic from a host in the DMZ to all but one of the "outside" networks. Is there a limit to the number of "outside" interfaces? I will provide a redacted config file as soon as possible.
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May 10, 2013
i have Cisco ASA 5550 and i want to do URL filtering using Web sense,can i use Micorsoft Forefront TMG2010 as websense server to do that?
the idea is to filter the HTTP & HTTPS URLs,if the Micorsoft Forefront TMG2010 is not suitable,refer to suitable Websense URL filtering server?
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Oct 3, 2011
I have the following problem, right now we have an ASA 5550 connected to the client´s side. A reset is being received on the client´s side, but when we run the sniffers on both extremes of the network, we can see that the reset is not being sent by the server´s side.
We have narrowed it down to the 5550 ASA, but have found no bug that matches the description.
The characateristics of the reset packet are the following:
- It is the only packet with a TTL of 255.
- Both server and client have very different window sizes, and the reset packet even though has the server´s ip and port as source of the packet, it has the client´s window size.
- It has a correct ack number.
-Before the reset is received, there are a couple of retransmissions of the last packet sent.
- We´re handling a VPN tunnel between both servers.
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Feb 7, 2011
i m looking for asa 5550 product.Part # ASA5550-BUN-K9 - Cisco ASA 5550 Appliance with SW, HA, 8GE+1FE, 3DES/AES
1) does 5550 contains built in CSC / IPS modules.? why i m asking because the "quick refrence guide " indicates that expansion slots are not available.
2) can asa 5550 natively protects natively against networks attacks against virus / worms etc with out CSC OR IPS MODULE.?
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Apr 23, 2013
I am about to carry out a migration from ASA 5550 to ASA 5555-X, however I cannot find any detailed document or reliable tool for this migration.
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May 22, 2012
I cannot logon with adsm anymore.when I run adsm, I type in my pw, and the screen keeps displaying "contacting the device". No timeout, just stays this way.I've updated the java version, no luck.I can connect with SSH with no problem. device = asa5550, 8.2(1) asdm 6.2(1) [code]
notice that there is no "with cookie-based authentication" here -- is this relevant?
Rebooting the device is not really an option.
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May 2, 2012
I have an issue were thousands of connections on the ASA are marked with flags E, below is a visual of the connection. Any ideas what could cause this marking? Also, I can't grasp what the meaing of an outside back connection (ie flags E).
TCP DMZ:X.X.X.X/139 Inside:X.X.X.X/1828, flags E, idle 9h37m, uptime 9h37m, timeout 15s, bytes 0
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