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Category:   Application (E-mail Server)  >   Fetchmail Vendors:   Raymond, Eric S.
(Conectiva Issues Fix) Fetchmail Executes Arbitrary Code Supplied By Remote Servers
SecurityTracker Alert ID:  1002368
SecurityTracker URL:  http://securitytracker.com/id/1002368
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Sep 8 2001
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 5.8.17
Description:   A memory modification vulnerability was reported in Fetchmail, allowing remote users to execute arbitrary code on the fetchmail server in certain situations.

It is reported that flaws in the pop3.c and imap.c files allow a remote user to 'poke' arbitrary memory addresses with 32 bit data. A remote user that is impersonating a POP3 or IMAP server that fetchmail queries can trigger this vulnerability. If the remote user can spoof the fetchmail server's DNS, then the remote user can potentially trigger the vulnerability without impersonating the POP3 or IMAP mail server.

Some demonstration exploit code is included in the Source Message.

Impact:   A remote user can cause fetchmail to execute arbitrary code with the privileges of the user account running fetchmail.
Solution:   The vendor has released a fix. See the Source Message for the vendor's advisory containing directions on how to obtain the appropriate fix.
Vendor URL:  www.tuxedo.org/~esr/fetchmail/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Conectiva)

Message History:   This archive entry is a follow-up to the message listed below.
Aug 11 2001 Fetchmail Executes Arbitrary Code Supplied By Remote Servers



 Source Message Contents

Subject:  [conectiva-updates] [CLA-2001:419] Conectiva Linux Security Announcement - fetchmail


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : fetchmail
SUMMARY   : Remote vulnerability in fetchmail
DATE      : 2001-09-05 16:31:00
ID        : CLA-2001:419
RELEVANT
RELEASES  : 4.0, 4.0es, 4.1, 4.2, 5.0, prg graficos, ecommerce, 5.1, 6.0, 7.0

- -------------------------------------------------------------------------

DESCRIPTION
 Fetchmail is a program used to retrieve email from POP and IMAP
 servers.
 Salvatore Sanfilippo did an audit and found a remote vulnerability in
 fetchmail that allows a remote attacker to write arbitrary data into
 memory. To take advantage of this problem, an attacker has to have
 control over the mail server being queried by the fetchmail process.


SOLUTION
 All fetchmail users should upgrade.
 
 IMPORTANT: if fetchmail is running as a daemon, it will have to be
 restarted after applying the update in order to run the new version.
 
 
 REFERENCES
 1. http://www.securityfocus.com/bid/3166
 2. http://www.securityfocus.com/bid/3164
 3. http://www.tuxedo.org/~esr/fetchmail


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/4.0/SRPMS/fetchmail-5.0.0-5U40_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/fetchmail-5.0.0-5U40_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/fetchmailconf-5.0.0-5U40_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/SRPMS/fetchmail-5.0.0-5U40_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/fetchmail-5.0.0-5U40_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/fetchmailconf-5.0.0-5U40_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/SRPMS/fetchmail-5.0.0-6U41_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/fetchmail-5.0.0-6U41_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/fetchmailconf-5.0.0-6U41_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/SRPMS/fetchmail-5.0.0-6U42_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/fetchmailconf-5.0.0-6U42_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/fetchmail-5.0.0-6U42_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/fetchmail-5.5.5-2U50_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/fetchmail-5.5.5-2U50_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/fetchmailconf-5.5.5-2U50_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/fetchmail-5.5.5-2U51_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/fetchmailconf-5.5.5-2U51_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/fetchmail-5.5.5-2U51_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/fetchmail-5.5.5-2U60_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmail-5.5.5-2U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/fetchmailconf-5.5.5-2U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/fetchmail-5.8.8-2U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmail-5.8.8-2U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmailconf-5.8.8-2U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/fetchmail-doc-5.8.8-2U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/fetchmail-5.5.5-2U50_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/fetchmail-5.5.5-2U50_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/fetchmailconf-5.5.5-2U50_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/fetchmail-5.5.5-2U50_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/fetchmail-5.5.5-2U50_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/fetchmailconf-5.5.5-2U50_2cl.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-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Comment: For info see http://www.gnupg.org

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