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Category:   Application (E-mail Server)  >   Exim Vendors:   Exim.org
(Debian Releases Fix) Re: Exim Mail Server May Allow Remote Users to Execute Arbitrary Code with Root-Level Privileges on the Server
SecurityTracker Alert ID:  1001717
SecurityTracker URL:  http://securitytracker.com/id/1001717
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jun 10 2001
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability has been reported in the Exim mail server that may allow a remote user to execute arbitrary code on the server.

It is reported that when Exim is configured to check incoming mail headers for proper syntax, the vulnerability can be triggered. This is configured through the /etc/exim.conf headers_check_syntax option. By default, this option is not set.

The vulnerability reportedly exists in the accept.c module where the moan_smtp_batch() function is called.

A demonstration exploit transcript is provided in the Source Message.

Impact:   A remote user can execute arbitrary code on the server with root-level privileges.
Solution:   Debian has released a fix. See the Source Message for the vendor's advisory.
Vendor URL:  www.exim.org/ (Links to External Site)
Cause:   Input validation error
Underlying OS:   Linux (Debian)

Message History:   This archive entry is a follow-up to the message listed below.
Jun 6 2001 Exim Mail Server May Allow Remote Users to Execute Arbitrary Code with Root-Level Privileges on the Server



 Source Message Contents

Date:  Sun, 10 Jun 2001 01:46:42 +0200
Subject:  [SECURITY] [DSA-058-1] exim printf format attack


-----BEGIN PGP SIGNED MESSAGE-----

- ------------------------------------------------------------------------
Debian Security Advisory DSA-058-1                   security@debian.org
http://www.debian.org/security/                         Wichert Akkerman
June 10, 2001
- ------------------------------------------------------------------------


Package        : exim
Problem type   : remote printf format attack
Debian-specific: no

Megyer Laszlo found a printf format bug in the exim mail transfer
agent. The code that checks the header syntax of an email logs
an error without protecting itself against printf format attacks.

This problem has been fixed in version 3.12-10.1. Since that code is
not turned on by default a standard installation is not vulnerable,
but we still recommend to upgrade your exim package.

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.


Debian GNU/Linux 2.2 alias potato
- ---------------------------------

  Potato was released for alpha, arm, i386, m68k, powerpc and sparc.

  Source archives:
    http://security.debian.org/dists/stable/updates/main/source/exim_3.12-10.1.diff.gz
      MD5 checksum: 959d5e70c78dd0f8daf1bcb470d2851a
    http://security.debian.org/dists/stable/updates/main/source/exim_3.12-10.1.dsc
      MD5 checksum: c3ae78797cc1da77b074b91c80f21fc8
    http://security.debian.org/dists/stable/updates/main/source/exim_3.12.orig.tar.gz
      MD5 checksum: 336cd605cb121703af4f22a8c34bb333

  ARM architecture:
    http://security.debian.org/dists/stable/updates/main/binary-arm/exim_3.12-10.1_arm.deb
      MD5 checksum: 8553e97eef733ab850eba6926bead792
    http://security.debian.org/dists/stable/updates/main/binary-arm/eximon_3.12-10.1_arm.deb
      MD5 checksum: 2b56110866983b0bc4828bc0e4b0b7bd

  Alpha architecture:
    http://security.debian.org/dists/stable/updates/main/binary-alpha/exim_3.12-10.1_alpha.deb
      MD5 checksum: 5e304c46581e3a1e6278b6a677b8308d
    http://security.debian.org/dists/stable/updates/main/binary-alpha/eximon_3.12-10.1_alpha.deb
      MD5 checksum: b01e0f2d7986475eba02c280f5321cf2

  Intel IA-32 architecture:
    http://security.debian.org/dists/stable/updates/main/binary-i386/exim_3.12-10.1_i386.deb
      MD5 checksum: d7e4c6e286fae05abfce28841dc0530e
    http://security.debian.org/dists/stable/updates/main/binary-i386/eximon_3.12-10.1_i386.deb
      MD5 checksum: 9dc3b11692b7047fef58c5a8da7741d8

  Motorola 680x0 architecture:
    http://security.debian.org/dists/stable/updates/main/binary-m68k/exim_3.12-10.1_m68k.deb
      MD5 checksum: 56ccf16d58ce07217a12809fca325597
    http://security.debian.org/dists/stable/updates/main/binary-m68k/eximon_3.12-10.1_m68k.deb
      MD5 checksum: 8031e4a9a8a65a63fdc686e81af0b469

  PowerPC architecture:
    http://security.debian.org/dists/stable/updates/main/binary-powerpc/exim_3.12-10.1_powerpc.deb
      MD5 checksum: 925523b2d5cb6aa43d146aec7125d59c
    http://security.debian.org/dists/stable/updates/main/binary-powerpc/eximon_3.12-10.1_powerpc.deb
      MD5 checksum: 9fa51619d73061c7c221bb876bf65047

  Sun Sparc architecture:
    http://security.debian.org/dists/stable/updates/main/binary-sparc/exim_3.12-10.1_sparc.deb
      MD5 checksum: b13d02e8d2eb3542c8876f81051e29c7
    http://security.debian.org/dists/stable/updates/main/binary-sparc/eximon_3.12-10.1_sparc.deb
      MD5 checksum: ae8d1ac5b1b228deea25ba8a89c77d21

  These packages will be moved into the stable distribution on its next
  revision.

For not yet released architectures please refer to the appropriate
directory ftp://ftp.debian.org/debian/dists/sid/binary-$arch/ .

- -- 
- ----------------------------------------------------------------------------
apt-get: deb http://security.debian.org/ stable/updates main
dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org

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Charset: noconv

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