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Category:   Application (E-mail Server)  >   Exim Vendors:   Exim.org
(Conectiva Issues Fix) Exim Mail Server Pipe Address Validation Error May Let Remote Users Execute Arbitrary Code With Root Privileges in a Certain Configuration
SecurityTracker Alert ID:  1003288
SecurityTracker URL:  http://securitytracker.com/id/1003288
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 18 2002
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to Exim 3.34 and Exim 3.952 (alpha for Exim 4)
Description:   A vulnerability was reported in the Exim mail server. In a certain configuration, a remote user could cause arbitrary commands to be executed on the server with root level privileges, giving the user root level access on the server.

A remote user may be able to execute shell commands on the server if the server is configured in a specific manner. In a run time configuration that directs or routes an address to a pipe transport without checking the local part of the address in any way, the system may be vulnerable. An example of this type of configuration is where all incoming mail is sent directly to a virus checker by means of a pipe, without inspecting the local parts of addresses.

The bug can reportedly be triggered by routing/directing an address whose local part begins with a pipe symbol (vertical bar, "|") to a pipe transport. As a result, Exim will run the command encoded in the local part instead of obeying the pipe command.

The author of the report notes that Patrice Fournier discovered and reported the problem.
Impact:   A remote user can execute arbitrary shell commands on the server with root level privileges if the server is configured in a particular manner.
Solution:   The vendor has released a fix and recommends that all Exim users upgrade their packages.

ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/exim-3.16-4U60_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/exim-3.16-4U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/exim-doc-3.16-4U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/exim-mon-3.16-4U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/exim-3.22-9U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-3.22-9U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-config-samples-3.22-9U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-doc-3.22-9U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-mon-3.22-9U70_1cl.i386.rpm

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
Vendor URL:  www.exim.org/ (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.
Dec 19 2001 Exim Mail Server Pipe Address Validation Error May Let Remote Users Execute Arbitrary Code With Root Privileges in a Certain Configuration


 Source Message Contents
Date:  Fri, 18 Jan 2002 14:18:16 -0200
Subject:  [conectiva-updates] [CLA-2002:454] Conectiva Linux Security Announcement - exim


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

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

PACKAGE   : exim
SUMMARY   : Remote command execution
DATE      : 2002-01-18 14:17:00
ID        : CLA-2002:454
RELEVANT
RELEASES  : 6.0, 7.0

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

DESCRIPTION
 Exim is a popular email server (MTA).
 
 Versions prior do 3.34 have a vulnerability[1] which can be used by a
 remote attacker to execute arbitrary commands on the server under
 certain conditions.
 
 The default configuration doesn't trigger this vulnerability.
 According to Philip Hazel[2] in a post to the exim-announce mailing
 list, the problem only exists when there is a pipe transport being
 used (which is common with anti-virus software, for example) where
 the local part of the address isn't checked. In this case, if there
 is a pipe ("|") in that local part, commands encoded in it will be
 executed by Exim.


SOLUTION
 It is recommended that all Exim users upgrade their packages.
 
 
 REFERENCES
 1. http://www.securityfocus.com/bid/3728
 2. http://www.exim.org/pipermail/exim-announce/2001q4/000048.html


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/exim-3.16-4U60_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/exim-3.16-4U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/exim-doc-3.16-4U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/exim-mon-3.16-4U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/exim-3.22-9U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-3.22-9U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-config-samples-3.22-9U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-doc-3.22-9U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/exim-mon-3.22-9U70_1cl.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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE8SErH42jd0JmAcZARAgwqAJ9PhX+pbpYcFz+wDz/nP43/WY44EACbBraw
yJ8LfKooMc1w/2onSUIw7HI=
=Jptp
-----END PGP SIGNATURE-----


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