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LinuxSecurity.com: LinuxSecurity.com Releases the Linux Security Quick Reference Card

Jul 27, 2000, 01:19 (0 Talkback[s])
(Other stories by Dave Wreski)

[ Thanks to Dave Wreski for this link. ]

"This Quick Reference Card is intended to provide a starting point for improving the security of your system. Contained within include references to security resources around the net, tips on securing your Linux box, and general security information. It is intended to be printed on 8x11" US paper in Landscape."

"Using the lsattr and chattr commands, administrators can modify characteristics of files and directories, including the ability to control deletion and modification above what normal chmod provides. The use of "append-only" and "immutable" attributes can be particularly effective in preventing log files from being deleted, or Trojan Horses from being placed on top of trusted binaries. While not a guarantee a system file or log won't be modified, only root has the ability to remove this protection. The chattr command is used to add or remove these properties, while the lsattr can be used to list them."

"There should never be a reason for user's to be able to run setuid programs from their home directories. Use the nosuid option in /etc/fstab for partitions that are writable by others than root. You may also wish to use the nodev and noexec on user's home partitions, as well as /var, which prohibits execution of programs, and creation of character or block devices, which should never be necessary anyway. See the mount man page for more information."

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