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Home » Hacking News » Connectiva CLA-2003:614: sendmail buffer overflow

Connectiva CLA-2003:614: sendmail buffer overflow

by Nikola Strahija on April 6th, 2003 A buffer overflow vulnerability has been found in sendmail versions 8.12.8 and below which, if exploited, can allow remote attackers to issue Denial of Service attacks or execution of arbitrary code.


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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : sendmail
SUMMARY : Buffer overflow vulnerability
DATE : 2003-04-04 15:10:00
ID : CLA-2003:614
RELEVANT
RELEASES : 6.0, 7.0, 8

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DESCRIPTION
Sendmail[1] is a widely used Mail Transfer Agent (MTA).

Michal Zalewski reported[6] a remote vulnerability[5] in sendmail
versions 8.12.8 and below. The vulnerability lies in the address
parser which performs insufficient bounds checking in certain
conditions due to a char to int conversion.

It is believed to be possible for remote attackers to cause a Denial
of Service condition and to even execute arbitrary commands with the
same permissions under which the sendmail daemon runs, which is
root.

The sendmail authors have released a new version[2], 8.12.9, which
fixes this vulnerability. They have also made available patches[3]
for older versions, which the packages provided via this announcement
contain.

Starting with Conectiva Linux 7.0, sendmail is no longer the default
mail server and has been replaced with Postfix. But sendmail is still
shipped in all Conectiva Linux versions.


SOLUTION
All sendmail users should upgrade immediately. If the service is
already active, it should be restarted after the upgrade in order to
close the vulnerability. To do so, execute the following command as
root:

/sbin/service sendmail restart


REFERENCES
1. http://www.sendmail.org/
2. http://www.sendmail.org/8.12.9.html
3. http://www.sendmail.org/patchps.html
4. http://www.cert.org/advisories/CA-2003-12.html
5. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0161
6. http://marc.theaimsgroup.com/?l=bugtraq&m=104897487512238&w=2


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/sendmail-8.11.6-1U60_4cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/sendmail-8.11.6-1U60_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/sendmail-cf-8.11.6-1U60_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/sendmail-doc-8.11.6-1U60_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/sendmail-8.11.6-1U70_4cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/sendmail-8.11.6-1U70_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/sendmail-cf-8.11.6-1U70_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/sendmail-doc-8.11.6-1U70_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/sendmail-8.11.6-2U80_4cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/sendmail-8.11.6-2U80_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/sendmail-cf-8.11.6-2U80_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/sendmail-doc-8.11.6-2U80_4cl.i386.rpm


ADDITIONAL INSTRUCTIONS
The apt tool can be used to perform RPM packages upgrades:

- 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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Copyright 2003 (c) Conectiva Inc.
http://www.conectiva.com

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subscribe: [email protected]
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