[CLA-2002:530] Conectiva Linux Security Announcement - apache

[secure () conectiva com br]

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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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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

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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


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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://distro.conectiva.com.br/atualizacoes/?idioma=en

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