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Attacks by ZmEu or w00tw00t robots

Who is ZmEu?

An image showing ZmeuThe name Zmeu (no capital E) is the name of a fantastic creature of Romania. There are so many stories that there isn't a clear understanding of what it is... but it is human like, can spit fire and wants to marry young women.

If you're wondering, it is generally a bad guy.

ZmEu Attack

Today, I noticed a lot of traffic on one of my servers. Looking into what was happening, I immediately found out that an attacker was looking for a loophole in that system. That attack was being performed from China.

Adding a group for to a logged in Linux user

Once in a while I want to add my user to a group and then right away make use of that group.

Unfortunately, in general Unix kind of forces you to re-log in for the new group to be attached to your account.

However, a command has been added, a while back, to do just that on the fly. Not something you would want to use in a script, but at least, it works for me when doing a few things here and there.

In my case, I wanted to run QEMU, which I hadn't done in a while, and the system told me that it could not open the KVM, the error: kvm permission denied.

The problem was that I was not part ...

Writing a CRON job in /etc/cron.*/job

Setup

When writing a CRON job script that you want to install under /etc/cron.*/job-name you must remember to apply the following steps:

1. Write the script and test it as root

2. Make sure to give it execution permission, usually 755

3. The ownership is expected to be root:root

4. The filename cannot include a period or the file it completely ignored

5. The script MUST start with #!/bin/sh or an equivalent (i.e. #!/bin/bash works too.)

6. Use full paths for most everything1

  • 1. Remember that the cron environment is minimal, you generally will have PATH defined and not much

MS-Access Record Locking

The MS-Access system has a limited way to lock records...

This is done within what is called the Recordset object. That object has a field called LockType.

Available lock types are Optimistic, Pessimistic, Table. The last one prevents all access from anyone else (read/write lock). Pessimistic locks let other users read the locked data, but not write (write-only lock). Optimistic locks do nothing (in other words, no locking.)

The following is a synopsis for this locking feature:

GNU Free Documentation License

                GNU Free Documentation License
                 Version 1.3, 3 November 2008


 Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
     
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

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