My web server - 488 Part III . Choosing and Installing a
Saturday, April 28th, 2007488 Part III . Choosing and Installing a Linux Distribution a wide range of tools for monitoring Linux or Windows systems, scanning for viruses, debugging networks, and doing forensics. Most bootable Linux systems will boot up on your network if a DHCP server is on the line. (If there isn t one, many include the netcardconfig utility to let you set up a wired Ethernet card manually.) So, with your computer booted and connected to a network with a bootable Linux, you could proceed to check, fix, back up, and otherwise control the local computer as well as other computers on your network. Here are suggestions of some of the ways you can use most Linux security/rescue CDs, based on open source software that many of these distributions contain: . Assessing vulnerability Tools for assessing vulnerabilities of your computer include those to let you scan shared Windows SMB folders (nbtscan), CGI scripts (nikto and screamingCobra), and the computer s ports (nmap), as well as scan for viruses (clamAV). You can also check if someone has used a rootkit to replace critical system files (chkrootkit), or you can use a scanner dispatch (warscan) to test any exploit you like across lots of machines. . Running forensics on Windows machines If you believe a Windows system has been compromised, there are many tools you can use to find problems and correct them. Boot a security CD, such as KNOPPIX-STD, and you can recover Internet Explorer cookies (galleta), convert Outlook Express dbx files to mbox format (readdbx and readoe), check system integrity with (ftimes), and check the Windows recycle bin (rifiuti). . Recovering data If a Windows or other operating system won t boot or is otherwise impaired, you can get data off that computer. You can copy files over the network (using rsync, scp, or others) or back up to local CD or tape (cpio, tar, or others). You can selectively recover file types from disk images (foremost) or check and recover lost partitions (testdisk). . Dealing with intruders Tools such as Snort (www.snort.org) let you analyze network traffic in real time, as well as log and analyze data as attacks are happening. Honeypots let you watch intruders moves as the honeypots lead intruders to believe they ve compromised your system. Honeypots in security- related Linux CDs include honeyd (http://honeyd.org), thp, and thpot (www.alpinista.org/thp). Kill zombies from DDoS attacks with zz. . Using and analyzing encryption techniques Many tools enable you to use encryption techniques to protect your data and find when others have tried to compromise it. GNP privacy guard (gpg) is used for verifying the authenticity of computers and people. For setting up virtual private networks, there are stunnel and super-freeSWAN VPNs. You can find images (giffshuffle, stegbreak, and stegdetect) and music (mp3stego) that contain hidden messages from a technique called steganography.
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