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Category:   Application (Generic)  >   CGI.pm Vendors:   Stein, Lincoln D.
(Conectiva Issues Fix) CGI.pm Library Input Validation Flaw Permits Remote Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1007335
SecurityTracker URL:  http://securitytracker.com/id/1007335
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 30 2003
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   An input validation vulnerability was reported in the 'CGI.pm' library. A remote user can conduct cross-site scripting attacks against an application based on the library, depending on how the library is used.

Scripts that use the start_form() function may be affected by this flaw. The function reportedly does not properly filter user-supplied input when creating web forms. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the vulnerable software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A demonstration exploit URL is provided:

http://host/script.pl?">some%20text<!--%20

Whether or not an application that uses the library is affected or not depends on how the library is used.

The vendor was reportedly notified on April 30, 2003.

Eye on Security reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running an application based on the library, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   Conectiva has released a fix.

ftp://atualizacoes.conectiva.com.br/8/SRPMS/perl-5.6.1-19U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/miniperl-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-base-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-devel-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-devel-static-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-doc-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-lib-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-modules-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-utils-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/perl-5.8.0-28837U90_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/libperl5.8-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/miniperl-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-base-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-devel-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-devel-static-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-doc-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-modules-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-suidperl-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-utils-5.8.0-28837U90_2cl.i386.rpm

Vendor URL:  stein.cshl.org/WWW/software/CGI/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Conectiva)
Underlying OS Comments:  8, 9

Message History:   This archive entry is a follow-up to the message listed below.
Jul 21 2003 CGI.pm Library Input Validation Flaw Permits Remote Cross-Site Scripting Attacks



 Source Message Contents

Subject:  [conectiva-updates] [CLA-2003:713] Conectiva Security Announcement - perl


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : perl
SUMMARY   : CGI.pm cross site scripting vulnerability
DATE      : 2003-07-29 14:53:00
ID        : CLA-2003:713
RELEVANT
RELEASES  : 8, 9

- -------------------------------------------------------------------------

DESCRIPTION
 Perl is a high-level interpreted programming language well known for
 its flexibility and ability to work with text streams.
 
 obscure@eyeonsecurity.org reported[1] a cross site scripting
 vulnerability in the CGI.pm perl module. This module is used to
 facilitate the creation of web forms and is part of the perl-modules
 RPM package.


SOLUTION
 It is recommended that all users of the CGI.pm module upgrade their
 packages.
 
 
 REFERENCES
 1. http://eyeonsecurity.org/advisories/CGI.pm/adv.html


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/SRPMS/perl-5.6.1-19U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/miniperl-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-base-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-devel-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-devel-static-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-doc-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-lib-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-modules-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/perl-utils-5.6.1-19U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/perl-5.8.0-28837U90_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/libperl5.8-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/miniperl-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-base-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-devel-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-devel-static-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-doc-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-modules-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-suidperl-5.8.0-28837U90_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/perl-utils-5.8.0-28837U90_2cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples 
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

- -------------------------------------------------------------------------
All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at 
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en

- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

- -------------------------------------------------------------------------
Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Comment: For info see http://www.gnupg.org

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FFwRu7idOx17DAywH+M8UKA=
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-----END PGP SIGNATURE-----



 
 


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