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Re: Security techniques every programmer should know

by fizbin (Chaplain)
on Dec 30, 2004 at 15:41 UTC ( #418279=note: print w/ replies, xml ) Need Help??

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  1. or download this
    # $page and $section are parameters from the user that have been clean
    +ed of 0 bytes and obvious control characters
      my $mantext = ''; my $status;
    ...
        else {exec('/usr/bin/man', $page);}
      }
    # now reformat $mantext and display it.
    
  2. or download this
      section=-P/usr/bin/whatever%20command%20I%20want&page=cat
    
  3. or download this
    # $page and $section are parameters from the user that have been clean
    +ed of 0 bytes and obvious control characters
      my $mantext = ''; my $status;
    ...
        else {exec('/usr/bin/man', '--', $page);}
      }
    # now reformat $mantext and display it.
    
  4. or download this
      my $qpage = quotemeta($page);
      my $qsect = quotemeta($section || '');
      exec("/usr/bin/man $qsect $qpage");
    
  5. or download this
    --
    @/=map{[/./g]}qw/.h_nJ Xapou cets krht ele_ r_ra/;
    map{y/X_/\n /;print}map{pop@$_}@/for@/
    

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