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Bug#436520: There is no policy on HTTP_PROXY variable, can we create one?

On Thu, Aug 16, 2007 at 07:34:51PM -0700, Don Armstrong <don@debian.org> wrote:
> On Fri, 17 Aug 2007, Junichi Uekawa wrote:
> > HTTP_PROXY, or http_proxy (and ftp_proxy) is used in many
> > applications within Debian.
> > 
> > There is a well-known remote attack using HTTP_* variables can be
> > set to arbitrary values for CGI scripts, and thus there is a need
> > for protection against that.
> Is there any reason why programs which use HTTP_PROXY can't check
> the capitalized env variable in such a case?
> [For reference, LWP ignores HTTP_PROXY for CGI_HTTP_PROXY in the
> presence of REQUEST_METHOD.]
> The alternative is just to require CGIs to unset HTTP_PROXY (though
> CGI writers sometimes aren't terribly aware of these things.)

I'm not sure this would also be a terribly good idea... How about CGIs
that need to get data from external HTTP servers which they can't access
if not through a proxy ? (such case *do* exist)


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