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Monthly Archives: June 2008

System Rescue CD

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System Rescue CD – is a Linux system on a bootable CD-ROM for repairing your system and recovering your data after a crash. It aims to provide an easy way to carry out admin tasks on your computer, such as creating and editing the partitions of the hard disk. It contains a lot of system utilities (parted, partimage, fstools, …) and basic tools (editors, midnight commander, network tools). It is very easy to use: just boot the CDROM. The kernel supports most of the important file systems (ext2/ext3, reiserfs, reiser4, xfs, jfs, vfat, ntfs, iso9660), as well as network filesystems (samba and nfs).

http://www.sysresccd.org/Main_Page
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HashTab Windows Shell Extension

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HashTab is a Windows shell extension which adds a tab called “File Hashes” to the Windows Explorer file properties. The tab contains the MD5, SHA1 and CRC-32 file hashes. These are common hashes that are used to verify the integrity and authenticity of files. Many download sites list the MD5 hash along with the download link. The HashTab makes it very simple for Windows users to check these hashes on any file on the system without using external tools.

Download and Website or goto:
http://beeblebrox.org/hashtab/

ssh-vulnkey

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A new tool has been added to OpenSSH from the recent Debian OpenSSH and OpenSSL security issues of Predictable Random Number Generator – ssh-vulnkey.

It is installed by default when you update OpenSSH.
Run the “ssh-vulnkey -a” command as root to get a listing of vulnerable keys for all users on
the system:
# ssh-vulnkey -a
The -a option will check keys of all users on the system.
For each user, ssh-vulnkey will check ~/.ssh/id_rsa, ~/.ssh/id_dsa, ~/.ssh/identity, ~/.ssh/authorized_keys and ~/.ssh/authorized_keys2. It will also check the system’s host keys.

When you run that command, if you’re lucky, all keys will start with these words:
Not blacklisted:
If you’re unlucky enough to have keys generated during the vulnerable period, you will instead see key listings:
COMPROMISED:

See “Debian openssh/openssl — predictable random number generator” blog posting.