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Special Forums Cybersecurity 'Shell Shock' vulnerability in Bourne shell Post 302918938 by achenle on Friday 26th of September 2014 09:42:52 AM
Old 09-26-2014
Not the way I understand it.

Any environment variable can be used to trigger the vulnerability.

CGI arguments are passed as environment variables (CGI, not fast CGI):

Common Gateway Interface - Wikipedia, the free encyclopedia

vs

FastCGI - Wikipedia, the free encyclopedia

So any bash CGI scripts - or any bash scripts called by any CGI process - are vulnerable.

And SSH accounts are vulnerable if you allow the remote user to set ANY environment variables, such as LC_* for localization.
 

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AppConfig::CGI(3)					User Contributed Perl Documentation					 AppConfig::CGI(3)

NAME
AppConfig::CGI - Perl5 module for processing CGI script parameters. SYNOPSIS
use AppConfig::CGI; my $state = AppConfig::State->new(\%cfg); my $cgi = AppConfig::CGI->new($state); $cgi->parse($cgi_query); $cgi->parse(); # looks for CGI query in environment OVERVIEW
AppConfig::CGI is a Perl5 module which implements a CGI interface to AppConfig. It examines the QUERY_STRING environment variable, or a string passed explicitly by parameter, which represents the additional parameters passed to a CGI query. This is then used to update variable values in an AppConfig::State object accordingly. AppConfig::CGI is distributed as part of the AppConfig bundle. DESCRIPTION
USING THE AppConfig::CGI MODULE To import and use the AppConfig::CGI module the following line should appear in your Perl script: use AppConfig::CGI; AppConfig::CGI is used automatically if you use the AppConfig module and create an AppConfig::CGI object through the cgi() method. AppConfig::CGI is implemented using object-oriented methods. A new AppConfig::CGI object is created and initialised using the new() method. This returns a reference to a new AppConfig::CGI object. A reference to an AppConfig::State object should be passed in as the first parameter: my $state = AppConfig::State->new(); my $cgi = AppConfig::CGI->new($state); This will create and return a reference to a new AppConfig::CGI object. PARSING CGI QUERIES The "parse()" method is used to parse a CGI query which can be specified explicitly, or is automatically extracted from the "QUERY_STRING" CGI environment variable. This currently limits the module to only supporting the GET method. See AppConfig for information about using the AppConfig::CGI module via the cgi() method. AUTHOR
Andy Wardley, "<abw@wardley.org<gt"> COPYRIGHT
Copyright (C) 1997-2007 Andy Wardley. All Rights Reserved. Copyright (C) 1997,1998 Canon Research Centre Europe Ltd. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
AppConfig, AppConfig::State perl v5.12.1 2007-05-30 AppConfig::CGI(3)
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