[CLA-2002:531] Conectiva Linux Security Announcement - fetchmail
Date: Wed, 16 Oct 2002 13:05:57 -0200
From: secure@conectiva.com.br
To: conectiva-updates@papaleguas.conectiva.com.br, lwn@lwn.net,
Subject: [CLA-2002:531] Conectiva Linux Security Announcement - fetchmail
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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : fetchmail
SUMMARY : Multidrop mode vulnerabilities
DATE : 2002-10-16 13:05:00
ID : CLA-2002:531
RELEVANT
RELEASES : 6.0, 7.0, 8
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DESCRIPTION
Fetchmail is a popular mail retrieval and forwarding utility.
Stefan Esser discovered[1] two vulnerabilities in fetchmail functions
responsible for parsing message headers. These vulnerabilities are
present in unpatched versions of fetchmail prior to 6.1.0 and can be
exploited only if it is running in "multidrop" mode.
The first one is a broken boundary check, which can be exploited by a
remote attacker who is able to send a specially crafted DNS packet to
the victim. This attack can crash fetchmail, thus causing a Denial of
Service (DoS).
The second one is a buffer overflow. A remote attacker can exploit it
by sending a message with a specially crafted 'Received:' header
inside it. By exploiting this the attacker can execute arbitrary code
with the privileges of the user running fetchmail.
SOLUTION
All fetchmail users should upgrade.
IMPORTANT: if fetchmail is running as a daemon, it will have to be
restarted in order to run the new version.
REFERENCES:
1.http://security.e-matters.de/advisories/032002.html
DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmail-5.9.12-1U60_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmailconf-5.9.12-1U60_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmail-doc-5.9.12-1U60_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/fetchmail-5.9.12-1U60_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmail-5.9.12-1U70_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmailconf-5.9.12-1U70_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmail-doc-5.9.12-1U70_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/fetchmail-5.9.12-1U70_3cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/fetchmail-5.9.12-1U80_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/fetchmailconf-5.9.12-1U80_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/fetchmail-doc-5.9.12-1U80_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/fetchmail-5.9.12-1U80_2cl.src.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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