Re: CVE Request -- libfcgi-perl / perl-FCGI: Certain environment variables shared between first and subsequent HTTP requests

[Moritz Muehlenhoff <jmm () debian org>]

On Thu, Sep 08, 2011 at 10:32:47AM +0200, Jan Lieskovsky wrote:
> Hello Josh, Steve, vendors,
>
>   it was found that the perl Fast CGI module did not properly clean up
> certain environment variables, related to a particular HTTP request,
> between subsequent incoming requests. Any environment variable set in
> the first pass through the code by processing the first request, that
> wasn't set in some subsequent request, has been added to the hash
> containing environment variables for that subsequent request. A remote
> attacker could use this flaw to bypass the authentication process and
> obtain access to resources, which would be otherwise protected by
> authentication.
>
> References:
> [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=607479
> [2] https://bugzilla.redhat.com/show_bug.cgi?id=736604
>
> Russ Allbery of Debian (Cc-ed) provides further elaborated analysis
> of the reasons of the issue:
> [3] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=607479#10
>
> Cc-ed also Sven Verdoolaege, the perl FCGI module author (as noted
> on CPAN) for his opinion too.
>
> Could you allocate a CVE id for this issue?
>
> Thank you && Regards, Jan.
> --
> Jan iankko Lieskovsky / Red Hat Security Response Team
>
> P.S.: Though the issue has been reported Sat, 18 Dec 2010 22:13:40 +0100
>       already, only Russ's analysis (Wed, 07 Sep 2011 20:24:00 -0700)
>       unveiled the full security implications of this issue. So I
>       assume, the CVE-2011-* identifier would be sufficient to cover
>       this issue. But feel free to correct me if I am wrong here.
>       Thanks, Jan.

FYI: Debian already allocated CVE-2011-2766 to this.
http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=19;bug=607479

Cheers,
        Moritz