How many world writeable files on your system? (Mandriva Linux msec)

# wc -l /var/log/security/writable.today
Mandriva Linux includes a security tool called "msec" (configurable via "draksec"). One of the many things it regularily checks for is world writeable files. If any are found, it writes the list to /var/log/security/writable.today. "wc -l" simply counts the number of lines in the file. This number should be low. Browse through /var/log/security/writable.today and consider if any of those files *need* to be world-writeable (and if not, modify the permissions. eg: "chmod o-w $file"). A large number of world-writeable files may indicate that umask is not correctly set in /etc/profile (or ${HOME}/.bash_profile) but could also indicate poor security configuration or even malicious activity.
Sample Output
# wc -l /var/log/security/writable.today
7 /var/log/security/writable.today

0
By: mpb
2009-03-19 12:25:52
wc

These Might Interest You


  • 0
    sudo find / -perm -2 ! -type l -ls
    gwd · 2012-07-13 07:01:42 0
  • Example of using zsh glob qualifier ... "." = files "f:" = files with access rights matching: o+w = other plus write


    0
    print -rl /**/*(.f:o+w:)
    khayyam · 2013-04-03 02:53:00 0
  • Update a Mandriva Linux system with any pending updates. This command needs to be run with root privilege. Using the "--force" option answers "yes" to any interactive prompts thus allowing the updates to be left unattended to completion. NB if there is an update for glibc and/or a new kernel then the system would need to be rebooted for these to take effect. A prerequisite for running "urpmi --auto-update" is to have correctly defined urpmi media sources (which can be done by visiting http://easyurpmi.zarb.org/). If there are no new updates the the message "Packages are up to date" is shown. Show Sample Output


    0
    urpmi --auto-update --force # apply all pending updates (Mandriva Linux)
    mpb · 2009-03-28 14:59:26 0
  • Look for an rpm that supplies a specific file that you don't yet have installed. extremely useful when you need something and don't know where it is.. or what its called. note: uses grep like syntax. Show Sample Output


    1
    urpmf lib/blah
    ender_x · 2009-03-03 16:21:52 2

What Others Think

Similarly: find / -xdev -type f -perm -o=w -xdev prevents descending into other filesystems (your call). -type f prevents listing symlinks, which are nominally, but not really, world-writable.
citybadger · 479 weeks and 2 days ago
"msec" is run from crontab so the /var/log/security/writable.today file is there "already". You don't have to wait for a find to work its way all through the entire filesystem.
mpb · 479 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands



Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: