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Home » Hacking News » CLA-2002:465-Buffer overflow in the mod_ssl module used by apache

CLA-2002:465-Buffer overflow in the mod_ssl module used by apache

by Nikola Strahija on March 4th, 2002 "mod_ssl"[1] is an Apache module which enables the use of encrypted connections ("https://") to the web server and other crypto-related functions. Ed Moyle announced[2] a buffer overflow vulnerability[3] in the mod_ssl module. This module is not part of the apache distribution, but is bundled and enabled by default in the Conectiva Linux Apache packages.


A remote attacker could exploit this vulnerability and execute
arbitrary commands on the server running apache with this module
enabled. A probable way to explore this is via client certificate
authentication, where the attacker would use a specially crafted
certificate to overflow this buffer. Since this vulnerability happens
only after the client certificate has been checked, this means that
it would have to be signed by a CA accepted by the apache server.


SOLUTION
It is recommended that all apache users upgrade their packages. SSL
support can also be disabled if the update can not be installed
immediately. To disable it, edit /etc/rc.d/init.d/httpd and remove
the "-DSSL" parameter.

IMPORTANT: the apache server has to be restarted after upgrading the
packages. To do this, please execute, as root:

service httpd stop

(wait a few seconds and check with "ps ax|grep httpd" if there are
any httpd processes running. On a busy webserver this could take a
little longer.)

service httpd start


REFERENCES
1. http://www.modssl.org
2. http://online.securityfocus.com/archive/1/258646
3. http://online.securityfocus.com/bid/4189


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/apache-1.3.22-1U50_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/apache-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/apache-devel-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/apache-doc-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/apache-1.3.22-1U51_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/apache-1.3.22-1U51_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/apache-doc-1.3.22-1U51_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/apache-devel-1.3.22-1U51_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/apache-1.3.22-1U60_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/apache-1.3.22-1U60_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/apache-devel-1.3.22-1U60_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/apache-doc-1.3.22-1U60_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/apache-1.3.22-1U70_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/apache-1.3.22-1U70_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/apache-devel-1.3.22-1U70_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/apache-doc-1.3.22-1U70_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/apache-1.3.22-1U50_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/apache-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/apache-devel-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/apache-doc-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/apache-1.3.22-1U50_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/apache-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/apache-devel-1.3.22-1U50_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/apache-doc-1.3.22-1U50_3cl.i386.rpm


ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:
- 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] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

- 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

- -------------------------------------------------------------------------
subscribe: [email protected]
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