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Re: Taint mode limitations

by MidLifeXis (Monsignor)
on Nov 02, 2012 at 16:04 UTC ( #1002003=note: print w/ replies, xml ) Need Help??


in reply to Taint mode limitations

Note the difference between the following (assuming windows, adjust system as necessary).

perl -T -e "$ENV{PATH}='c:\\windows'; $string='original'; $string=$1 i +f $ARGV[0] =~ /([a-zA-Z]+)/; system qq(notepad.exe $string) and die $ +!" perl -T -e "$ENV{PATH}='c:\\windows'; $string='original'; $string=$1 i +f $ARGV[0] =~ /([a-zA-Z]+)/; system qq(notepad.exe $string) and die $ +!" foo perl -T -e "$ENV{PATH}='c:\\windows'; $string=$ARGV[0]; $string =~ s +/ //g; system qq(notepad.exe $string) and die $ +!" perl -T -e "$ENV{PATH}='c:\\windows'; $string=$ARGV[0]; $string =~ s +/ //g; system qq(notepad.exe $string) and die $ +!" foo

Only the last command generates the error message: Insecure dependency in system while running with -T switch at -e line 1.. The first two commands illustrate how to untaint a parameter, the last two commands are doing what I think you describe.

--MidLifeXis


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