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Category:   Application (E-mail Server)  >   Exim Vendors:   Exim.org
(Debian Issues Fix) Exim Buffer Overflows in host_aton() and spa_base64_to_bits() May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1012863
SecurityTracker URL:  http://securitytracker.com/id/1012863
CVE Reference:   CVE-2005-0021, CVE-2005-0022   (Links to External Site)
Date:  Jan 12 2005
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.43 and prior versions
Description:   Two vulnerabilities were reported in Exim. A local user may be able to obtain elevated privileges.

Philip Hazel reported that there is a buffer overflow in the host_aton() function. A local user can supply an illegal IPv6 address with more than 8 components via the command line to trigger this flaw. It may be possible to execute arbitrary code with the privileges of the Exim process.

There is also a buffer overflow in the spa_base64_to_bits() function, used for SPA authentication. The impact was not specified.

Impact:   A local user may be able to execute arbitrary code with the privileges of the Exim process [but the report did not confirm this].
Solution:   Debian has released a fix for the stable distribution (woody) in version 3.35-1woody4 and for the unstable distribution (sid) in version 3.36-13 of exim and 4.34-10 of exim4.

Debian GNU/Linux 3.0 alias woody:

Source archives:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4.dsc
Size/MD5 checksum: 661 d97ecab579bd3dbaa3e9be00b8b16d85
http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4.diff.gz
Size/MD5 checksum: 80195 a02abeefa9d1145ae623ad661aab5f5a
http://security.debian.org/pool/updates/main/e/exim/exim_3.35.orig.tar.gz
Size/MD5 checksum: 1271057 42d362e40a21bd7ffc298f92c8bd986a

Alpha architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_alpha.deb
Size/MD5 checksum: 872796 a46f5dc95d777366cb492eb57ec8dd9f
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_alpha.deb
Size/MD5 checksum: 52318 bf93e35aec9f401d8413015c50f5cbae

ARM architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_arm.deb
Size/MD5 checksum: 785980 5ced90e4c4ecd1ca6a60980634b309e8
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_arm.deb
Size/MD5 checksum: 43514 07b7324395ff66f68db354c6b4589db7

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_i386.deb
Size/MD5 checksum: 759270 9001a456b0a34f4bf5de88d901c70a97
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_i386.deb
Size/MD5 checksum: 39210 78e5eecee7101a355ddabec9d0f07b98

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_ia64.deb
Size/MD5 checksum: 972852 43f4fc30483d8ad5c42e031fd64a9e8d
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_ia64.deb
Size/MD5 checksum: 65166 cdc921d9be2ec60b5f0ed95a5b976732

HP Precision architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_hppa.deb
Size/MD5 checksum: 815358 c506baffb4404f32762468fbc494551c
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_hppa.deb
Size/MD5 checksum: 48294 d90efe5be79e966e07a7cbe8e9013939

Motorola 680x0 architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_m68k.deb
Size/MD5 checksum: 737856 aefe6b63ebd03e9fe449afe22e752547
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_m68k.deb
Size/MD5 checksum: 37752 e0d2b938e50c3b408928b8150459ad2b

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_mips.deb
Size/MD5 checksum: 824458 0c1db679287a6de37f2c320f335c650c
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_mips.deb
Size/MD5 checksum: 48882 1670c36409482a8a870becf826f7ae68

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_mipsel.deb
Size/MD5 checksum: 824846 88564f1d1b0c1781587d5db1bccdde77
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_mipsel.deb
Size/MD5 checksum: 48778 6a7002c766a84dd81eed39d23f8709d5

PowerPC architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_powerpc.deb
Size/MD5 checksum: 794244 abfa2009cd6417101d120a5980641012
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_powerpc.deb
Size/MD5 checksum: 44794 ea626fcb485a423fb56e61a1c4ae67e9

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_s390.deb
Size/MD5 checksum: 780026 bc9a3b5488cd7ee72c290f86f601beec
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_s390.deb
Size/MD5 checksum: 43930 f50688c682bcaeabfbd47c9e46a06143

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_sparc.deb
Size/MD5 checksum: 785298 1841407d21f544cf2645e373a6caad15
http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_sparc.deb
Size/MD5 checksum: 42444 632b5aadc5c930c7c3e956fef10d5ffe

Vendor URL:  www.exim.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Debian)
Underlying OS Comments:  3.0

Message History:   This archive entry is a follow-up to the message listed below.
Jan 5 2005 Exim Buffer Overflows in host_aton() and spa_base64_to_bits() May Let Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [SECURITY] [DSA 635-1] New exim packages fix arbitrary code execution


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

- --------------------------------------------------------------------------
Debian Security Advisory DSA 635-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
January 12th, 2005                      http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : exim
Vulnerability  : buffer overflow
Problem-Type   : remote
Debian-specific: no
CVE ID         : CAN-2005-0021
Debian Bug     : 289046

Philip Hazel announced a buffer overflow in the host_aton function in
exim, the default mail-tranport-agent in Debian, which can lead to the
execution of arbitrary code via an illegal IPv6 address.

For the stable distribution (woody) this problem has been fixed in
version 3.35-1woody4.

For the unstable distribution (sid) this problem has been fixed in
version 3.36-13 of exim and 4.34-10 of exim4.

We recommend that you upgrade your exim and exim4 packages.


Upgrade Instructions
- --------------------

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

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 3.0 alias woody
- --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4.dsc
      Size/MD5 checksum:      661 d97ecab579bd3dbaa3e9be00b8b16d85
    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4.diff.gz
      Size/MD5 checksum:    80195 a02abeefa9d1145ae623ad661aab5f5a
    http://security.debian.org/pool/updates/main/e/exim/exim_3.35.orig.tar.gz
      Size/MD5 checksum:  1271057 42d362e40a21bd7ffc298f92c8bd986a

  Alpha architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_alpha.deb
      Size/MD5 checksum:   872796 a46f5dc95d777366cb492eb57ec8dd9f
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_alpha.deb
      Size/MD5 checksum:    52318 bf93e35aec9f401d8413015c50f5cbae

  ARM architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_arm.deb
      Size/MD5 checksum:   785980 5ced90e4c4ecd1ca6a60980634b309e8
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_arm.deb
      Size/MD5 checksum:    43514 07b7324395ff66f68db354c6b4589db7

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_i386.deb
      Size/MD5 checksum:   759270 9001a456b0a34f4bf5de88d901c70a97
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_i386.deb
      Size/MD5 checksum:    39210 78e5eecee7101a355ddabec9d0f07b98

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_ia64.deb
      Size/MD5 checksum:   972852 43f4fc30483d8ad5c42e031fd64a9e8d
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_ia64.deb
      Size/MD5 checksum:    65166 cdc921d9be2ec60b5f0ed95a5b976732

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_hppa.deb
      Size/MD5 checksum:   815358 c506baffb4404f32762468fbc494551c
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_hppa.deb
      Size/MD5 checksum:    48294 d90efe5be79e966e07a7cbe8e9013939

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_m68k.deb
      Size/MD5 checksum:   737856 aefe6b63ebd03e9fe449afe22e752547
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_m68k.deb
      Size/MD5 checksum:    37752 e0d2b938e50c3b408928b8150459ad2b

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_mips.deb
      Size/MD5 checksum:   824458 0c1db679287a6de37f2c320f335c650c
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_mips.deb
      Size/MD5 checksum:    48882 1670c36409482a8a870becf826f7ae68

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_mipsel.deb
      Size/MD5 checksum:   824846 88564f1d1b0c1781587d5db1bccdde77
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_mipsel.deb
      Size/MD5 checksum:    48778 6a7002c766a84dd81eed39d23f8709d5

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_powerpc.deb
      Size/MD5 checksum:   794244 abfa2009cd6417101d120a5980641012
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_powerpc.deb
      Size/MD5 checksum:    44794 ea626fcb485a423fb56e61a1c4ae67e9

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_s390.deb
      Size/MD5 checksum:   780026 bc9a3b5488cd7ee72c290f86f601beec
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_s390.deb
      Size/MD5 checksum:    43930 f50688c682bcaeabfbd47c9e46a06143

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/e/exim/exim_3.35-1woody4_sparc.deb
      Size/MD5 checksum:   785298 1841407d21f544cf2645e373a6caad15
    http://security.debian.org/pool/updates/main/e/exim/eximon_3.35-1woody4_sparc.deb
      Size/MD5 checksum:    42444 632b5aadc5c930c7c3e956fef10d5ffe


  These files will probably be moved into the stable distribution on
  its next update.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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=OqTo
-----END PGP SIGNATURE-----


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