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Re: Essential CGI Security Practices

by footpad (Monsignor)
on Feb 03, 2002 at 06:20 UTC ( #143034=note: print w/replies, xml ) Need Help??


in reply to Essential CGI Security Practices

And I would add:

  • Don't accept more than is absolutely necessary. Example: MSA's formmail.pl can be used as a spam relay because it accepts recipient as a CGI parameter. Don't do that.

    Only accept the minimum number of parameters you need.

  • Don't trust anything from the client--period. I've seen cases where CGI scripts claim to be secure because they check REFERER, which is trivial to spoof.

  • Don't ever use a script that tells you to chmod a publically accessible file to 777 (Example: here).

  • Be highly suspicious of code that's been updated one or fewer times in the last several years. (Theory: No one was defending against DoS attacks in 1996.)

Not that I'm picking on anyone, of course. However, I have been helping a buddy run down various spammers that are playing on his system. Guess where the currently identified problems have come from?

--f

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[erix]: Ah, I found the link for my run: 6km (and 6km back)
[perldigious]: Also, made the unhappy discovery that the ticks have become active already this year... I really, really hate ticks.
[Lotus1]: perldigious I found out recently that opossums are very good at killing ticks.
Your Mother is lucky to only have to carry a kayak 15 feet to put in.
[perldigious]: If I was given the option to remove either mosquitos or ticks from the world... I think I'd pick ticks, even though I'd guess most would go the other way.
[Lotus1]: when they grooms themselves they eat any ticks they find. and apparently lots of ticks latch onto opossums.
[Your Mother]: There is a nice looking—don’t know first hand—new tool being market for removing ticks.
[Your Mother]: (marketed)
[Lotus1]: at least ticks don't fly
[1nickt]: We have a new tick in cenral New Jersey this year. The Lone Star tick -- no Lyme, but will give you an allergy to red meat!

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