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CONECTIVA LINUX SECURITY ANNOUNCEMENT

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PACKAGE   : php4

SUMMARY   : Problems with per-directory php directives and with virtual hosts

DATE      : 2001-01-18 13:52:00

ID        : CLA-2001:373

RELEVANT

RELEASES  : 6.0



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DESCRIPTION

 The php4 module shipped with Conectiva Linux 6.0 has two security

 problems that were recently made public by the PHP development team

 based on a report by James Moore:



 1) It is possible to specify PHP directives on a per-directory basis

 under apache. In the vulnerable versions of PHP, a remote attacker

 could craft an HTTP request that would cause the next page to be

 served with the wrong values for these directives.



 2) Even though PHP is installed, it can be deactivated and activated

 via a directive like "engine=off" or "engine=on". This directive can

 be used on a per-directory basis or even per virtual host. Vulnerable

 versions of the php4 module could "leak" the "engine=off" setting to

 other virtual hosts on the same machine, effectively disabling PHP

 for those hosts and resulting in PHP source code being sent to the

 client instead of being executed on the server.





SOLUTION

 It is recommended that all php4 module users upgrade their packages.

 A workaround for the second problem is to explicitly enable PHP on

 all virtual hosts that require it if at least one virtual host has

 the "engine=off" directive.



 3.0.x versions of the PHP module are not affected by these problems.





DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES

http://atualizacoes.conectiva.com.br/6.0/SRPMS/php4-4.0.4pl1-1cl.src.rpm

http://atualizacoes.conectiva.com.br/6.0/RPMS/php4-4.0.4pl1-1cl.i386.rpm

http://atualizacoes.conectiva.com.br/6.0/RPMS/php4-doc-4.0.4pl1-1cl.i386.rpm

http://atualizacoes.conectiva.com.br/6.0/RPMS/php4-imap-4.0.4pl1-1cl.i386.rpm

http://atualizacoes.conectiva.com.br/6.0/RPMS/php4-ldap-4.0.4pl1-1cl.i386.rpm

http://atualizacoes.conectiva.com.br/6.0/RPMS/php4-mysql-4.0.4pl1-1cl.i386.rpm

http://atualizacoes.conectiva.com.br/6.0/RPMS/php4-pgsql-4.0.4pl1-1cl.i386.rpm

http://atualizacoes.conectiva.com.br/6.0/RPMS/mod_php4-4.0.4pl1-1cl.i386.rpm





ADDITIONAL INSTRUCTIONS

 Users of Conectiva Linux version 6.0 or higher may use apt to perform

 upgrades:

 - add the following line to /etc/apt/sources.list if it is not there yet

   (you may also use linuxconf to do this):



 rpm [cncbr] http://atualizacoes.conectiva.com.br 6.0/conectiva updates



 - 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





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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



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All our advisories and generic update instructions can be viewed at

http://www.conectiva.com.br/suporte/atualizacoes



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subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br

unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br

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