Information Security

sbd : Backtrack 5: Maintaining Access: OS Backdoors: sbd

The sbd command is a netcat clone that offers decent encryption, allows for command execution, and will install on Linux or Windows. You are likely aware of netcat and all of the different ways you can use it including reverse shells, port scanning, etc. The sbd command is a great tool for opening up protected listeners or as noted in the Backtrack Linux menu for maintaining access to servers on compromised networks. Since it is likely you are familiar with nc or netcat below I go into setting up a reverse shell using a secret key between the listener and the connecting client.

Technology Errors

GPG key retrieval failed: [Errno 5] OSError: [Errno 2] No such file or directory: /etc/pki/rpm-gpg/RPM-GPG-KEY-remi

Earlier while upgrading PHP to version 5.3.5 on a CentOS server I copied over the details of the remi repository from another server I had upgraded PHP on. Once I started the transaction all looked well until Yum needed to verify the remi repo RPM GPG key which I had not installed so an error was provided and Yum stopped the PHP upgrade process. You can get around the RPM GPG key error by simply using the –nogpgcheck switch however that is not the correct way to resolve the problem. You should instead install the RPM GPG key and the below example shows how to install the RPM GPG key for the remi repo.

Technology Errors

WordPress database error Duplicate entry X for key yarpp_content for query UPDATE wp_posts SET, MySQL Error

Today I was adding a note to a WordPress article I had written a couple of days ago and it appeared to POST without issue after I clicked the Update button in the WordPress admin. I went to the front-end of the site to verify the new content formatted correctly and to my surprise it wasn’t displaying so I figured I must have left a HTML tag or something open since I didn’t get any errors within the WordPress admin when I clicked the Update button for the Post. After further review the content didn’t exist and it appeared that the article had not posted the update at all since there were zero revisions from today. Fixing the problem is easy by using the below information that describes where I located the error, the error itself, and how to resolve it by issuing a single MySQL command.

Technology Errors

Zen Cart New Product Error: 1062 Duplicate entry ‘2147483647’ for key ‘PRIMARY’

A client of mine contacted me earlier because he was unable to add products to his Zen Cart store. I recently installed a couple modules for him and was thinking that the issue may be related to one of the modules however this did not end up being the case. After some investigation I was able to resolve the problem easily by first deleting a product that had been added and then by issuing a SQL command to modify the auto increment numbers for the Zen Cart products table. Below there is more information on the error as well as details on how to resolve the issue.

Technology Errors

Cannot Delete Properties: Error While Deleting Key

Earlier this week I got into a Windows registry mess because of issues syncing my iPhone with my Windows 7 laptop. For some reason the AutoPlay function stopped working so I had to get into the registry and manually delete some keys. Along the way I ran into Windows Registry Keys that I was unable to delete however by using the directions below you can delete any registry key. Please note that you should not modify anything in your Windows Registry without knowing what you are doing and also without making sure you have backed up the registry before you begin.