Cisco Asa Generate Ssh Key Asdm

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Oct 14, 2008  Choose Configuration Properties Certificate Key Pair, click Add and use the default options presented in order to generate the same RSA keys with ASDM. Choose Configuration Properties Device Access Secure Shell in order to use ASDM to specify hosts allowed to connect with SSH and to specify the version and timeout options. Sep 06, 2014 Configure SSH Access in Cisco ASA. Step 1: Configure Enable password. (Optional) ASA(config)# enable password system@123. Step 2: Create a username with password. ASA(config)# username bipin password cisco@123. Step 3: Configure this local username to authenticate with SSH. ASA(config)# aaa authentication ssh console LOCAL. Step 4: Create RSA key pair. SSH to Cisco ASA fails, unable to negotiate, no matching key exchange method found. Posted on December 1, 2016 by jimmy — 12 Comments ↓ Short story: With SSH-clients based on OpenSSH 7.0 (like my OSX Mac) I cannot connect with SSH to a Cisco Firewall.

  1. Cisco Asa Enable Ssh Access
  2. Cisco Asa Ssh Access

Update: Securing Cisco ASA SSH server Enabling SSH has been covered here but it only talked about routers and switches. How about Cisco ASA? Today, I had to learn how to do it using CLI and not ASDM since I couldn’t find where the equivalent of aaa authentication ssh console LOCAL and crypto key gen rsa mod 4096 in the ASDM. How I create RSA key and enable SSH access in Cisco VG202, in a Cisco router I use the next commands(but in a VG not exists): conf t. Crypto key generate rsa modulus 1024. Ip domain-name domain-name.

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Sep 06, 2014  Configure SSH Access in Cisco ASA. Step 1: Configure Enable password. (Optional) ASA(config)# enable password system@123. Step 2: Create a username with password. ASA(config)# username bipin password cisco@123. Step 3: Configure this local username to authenticate with SSH. ASA(config)# aaa authentication ssh console LOCAL. Step 4: Create RSA key pair. SSH on the ASA is a fairly simple affair configured the default way, with users, passwords and restricting ssh internet access to specific IP addresses. That works, it needs no real explanation. What does need explanation however is the use of SSH key pairs.

Learning has never been so easy!

This guide will walk you through the basics of hardening SSH access to your Cisco ASA firewall using ASDM. If you're like me, you'd rather have a GUI than spending the day Googling CLI commands.

4 Steps total

Step 1: Login to ASDM

Step 2: Change the default allow SSH version from 1 to 2

Go to Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH

Under SSH Settings, change the value of 'Allowed SSH Version(s)' from 1 to 2.

Step 3: Change the default Diffie-Hellman group from 1 to 14

Remain in Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH

Under SSH Settings, change the radio toggle of 'DH Key Exchange' from Group 1 to Group 14.

Step 4: Lock down SSH access to the firewall

Remain in Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH

Under 'Specify the addresses of all hosts/networks which are allowed to access the ASA using ASDM/HTTPS/Telnet/SSH', you should add the static IPs of the devices or servers you wish to access the firewall from.

Click Add on the right.

Select the radio button next to SSH.

Select 'Inside' as the interface.

Enter the static IP of the device/server.

Enter 255.255.255.255 as the subnet mask.

Cisco Asa Enable Ssh Access

Click OK.

Generate

Repeat for all remaining devices/servers or specify any outside IPs which are static that require remote access.

WARNING: If your firewall has 0.0.0.0 'any' enabled by default, make sure you save your changes by adding your static IP first before deleting the 'any' entry. Otherwise, your session will disconnect.

You may repeat the last step for hardening access to ASDM as well.

3 Comments

Cisco Asa Ssh Access

  • Sonora
    alexthompson4 Oct 16, 2018 at 06:51pm

    Thank you for the guide! For accessing the ASA through SSH, what devices would you recommend connecting from (a server, etc) from a security standpoint?

  • Ghost Chili
    starg33ker Oct 16, 2018 at 06:56pm

    I only connect to the ASA from our Hyper-V host.

  • Sonora
    alexthompson4 Oct 16, 2018 at 07:02pm

    That's a good idea! I shall have to work on implementing it at my workplace.