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