-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------------------------------------------------------------------------- CONECTIVA LINUX SECURITY ANNOUNCEMENT - -------------------------------------------------------------------------- PACKAGE : apache SUMMARY : DoS and other vulnerabilities DATE : 2002-10-07 12:26:00 ID : CLA-2002:530 RELEVANT RELEASES : 6.0, 7.0, 8 - ------------------------------------------------------------------------- DESCRIPTION Apache[1] is the most popular webserver in use today. This apache update addresses three recent security vulnerabilities: CAN-2002-0839[3] There is a vulnerability regarding apache's use of shared memory (SHM). An attacker which is able to execute code under the webserver's UID is able to send arbitrary processes an USR1 signal as root. If untreated, the default for this signal is to terminate the process. Via this vulnerability, the attacker is also able to cause the apache process to continuously spawn more children, causing a local DoS. The fix for this vulnerability introduced the "ShmemUIDisUser" directive, which is documented in the apache-doc package. CAN-2002-0840[4] Matthew Murphy warned the apache developers about a cross site scripting vulnerability in the standard 404 error page. CAN-2002-0843[5] There are some buffer overflow vulnerabilities in the "ab" benchmark program included in the apache package. An attack scenario would be that of an user running the "ab" tool against a web server controlled by an attacker. All these vulnerabilities were fixed in the just released[2] 1.3.27 version of the apache web server. The packages available through the present update, even though they are remaining at version 1.3.26, include fixes for these problems. SOLUTION All apache users should upgrade the packages immediately. IMPORTANT: it is necessary to manually restart the httpd server after upgrading the packages. In order to do this, execute the following 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://httpd.apache.org/ 2.http://marc.theaimsgroup.com/?l=apache-httpd-users&m=103367270822891&w=2 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0839 4.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0840 5.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0843 DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/apache-1.3.26-1U60_4cl.src.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/apache-1.3.26-1U60_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/apache-devel-1.3.26-1U60_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/6.0/RPMS/apache-doc-1.3.26-1U60_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/apache-1.3.26-1U70_7cl.src.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/apache-1.3.26-1U70_7cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/apache-devel-1.3.26-1U70_7cl.i386.rpm ftp://atualizacoes.conectiva.com.br/7.0/RPMS/apache-doc-1.3.26-1U70_7cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/SRPMS/apache-1.3.26-1U8_4cl.src.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/apache-1.3.26-1U8_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/apache-devel-1.3.26-1U8_4cl.i386.rpm ftp://atualizacoes.conectiva.com.br/8/RPMS/apache-doc-1.3.26-1U8_4cl.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: conectiva-updates-subscribeat_private unsubscribe: conectiva-updates-unsubscribeat_private -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9oZmr42jd0JmAcZARArVsAJ4zOtLd3F9iVNbcWhUxhYRicmspYQCg2bXe c6XzUNGULdoBtaYp8ii7ZSE= =REjn -----END PGP SIGNATURE-----
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