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Category:   Application (Generic)  >   Metamail Vendors:   Borenstein, Nathaniel S. et al
(Debian Issues Fix) Metamail Format String Flaws and Buffer Overflows Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1009195
SecurityTracker URL:  http://securitytracker.com/id/1009195
CVE Reference:   CAN-2004-0104, CAN-2004-0105   (Links to External Site)
Date:  Feb 24 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.7 and prior versions
Description:   Some vulnerabilities were reported in Metamail in the decoding of MIME messages. A remote user can execute arbitrary code on the target system.

It is reported that Ulf Harnhammar discovered several vulnerabilities in Metamail versions 2.7 and prior versions. A remote user can reportedly send a specially crafted message so that when the target user views the message and Metamail parses the message, arbitrary code will be executed on the target user's system.

Two of the bugs are format string vulnerabilities [CVE: CAN-2004-0104] and two of the bugs are buffer overflows [CVE: CAN-2004-0105].

A format string flaw can reportedly be triggered by a message with a "multipart/alternative" media type and with a body part with a MIME "Content-Type" header that has parameter names or values containing formatting characters. The flaw reportedly resides in the SaveSquirrelFile() function in 'metamail.c'.

Another format string flaw can reportedly be triggered when an e-mail message contains encoded non-ASCII characters in the mail headers with an unknown encoding and with encoded text that contains formatting characters. The flaw reportedly resides in the PrintHeader() function, also in 'metamail.c'.

The report indicates that a buffer overflow in the PrintHeader() function in 'metamail.c' can be triggered by an e-mail message with encoded non-ASCII characters in the mail header where the section that specifies a character set is overly long.

Another buffer overflow exists in the 'splitmail' application, the report said. An overly long Subject header line can reportedly trigger the overflow in the ShareThisHeader() function in 'splitmail.c'.

Some demonstration exploit examples are available at:

http://labben.abm.uu.se/~ulha9485/metamail.advisory-data.tar.gz
Impact:   A remote user can cause arbitrary code to be executed on the target system when the target user views a malicious e-mail message.
Solution:   Debian has released a fix for the stable distribution (woody) in version 2.7-45woody.2 and for the unstable distribution (sid) in version 2.7-45.2 (pending).

Debian GNU/Linux 3.0 alias woody:

Source archives:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2.dsc
Size/MD5 checksum: 613 eb8246a16fb3e6dbbd80247b53ae8153
http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2.diff.gz
Size/MD5 checksum: 333224 532b053589bc1038ea55d340ab93ee6e
http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7.orig.tar.gz
Size/MD5 checksum: 156656 c6967e9bc5d3c919764b02df24efca01

Alpha architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_alpha.deb
Size/MD5 checksum: 165818 92127db2f58390fdbb168c9cf2ccc2ce

ARM architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_arm.deb
Size/MD5 checksum: 153160 72b8d81c7c4a9027b508c45fd5d8b39e

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_i386.deb
Size/MD5 checksum: 150252 2f3905d2923d8ecded2df290762b3c56

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_ia64.deb
Size/MD5 checksum: 205530 8cfce92a64a7df4c9630f3214aafc9e7

HP Precision architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_hppa.deb
Size/MD5 checksum: 153204 4e49ebddf0830708fb30a6cc0bfb064b

Motorola 680x0 architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_m68k.deb
Size/MD5 checksum: 146136 45fe19d01f7f76e394a09264bc2f57fb

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_mips.deb
Size/MD5 checksum: 158316 1b4ad52779b866c71c06f68f1c62e195

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_mipsel.deb
Size/MD5 checksum: 158310 97c128e30297e62459bd9d277c407b33

PowerPC architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_powerpc.deb
Size/MD5 checksum: 148476 a7b070e618315e1a45690c701f532435

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_s390.deb
Size/MD5 checksum: 151256 121b87823b2a3e4ead430bd4c165526e

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_sparc.deb
Size/MD5 checksum: 155234 24e5afafa0c3eb18540267e12651a337
Vendor URL:  bmrc.berkeley.edu/~trey/emacs/metamail.html (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Debian)

Message History:   This archive entry is a follow-up to the message listed below.
Feb 18 2004 Metamail Format String Flaws and Buffer Overflows Let Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Tue, 24 Feb 2004 12:29:17 +0100 (CET)
Subject:  [SECURITY] [DSA 449-1] New metamail packages fix arbitrary code execution


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

- --------------------------------------------------------------------------
Debian Security Advisory DSA 449-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
February 24th, 2004                     http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : metamail
Vulnerability  : buffer overflow, format string bugs
Problem-Type   : remote
Debian-specific: no
CVE ID         : CAN-2004-0104 CAN-2004-0105

Ulf Härnhammar discovered two format string bugs (CAN-2004-0104) and
two buffer overflow bugs (CAN-2004-0105) in metamail, an
implementation of MIME.  An attacker could create a carefully-crafted
mail message which will execute arbitrary code as the victim when it
is opened and parsed through metamail.

We have been devoting some effort to trying to avoid shipping metamail
in the future.  It became unmaintainable and these are probably not
the last of the vulnerabilities.

For the stable distribution (woody) these problems have been fixed in
version 2.7-45woody.2.

For the unstable distribution (sid) these problems will be fixed in
version 2.7-45.2.

We recommend that you upgrade your metamail package.


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/m/metamail/metamail_2.7-45woody.2.dsc
      Size/MD5 checksum:      613 eb8246a16fb3e6dbbd80247b53ae8153
    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2.diff.gz
      Size/MD5 checksum:   333224 532b053589bc1038ea55d340ab93ee6e
    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7.orig.tar.gz
      Size/MD5 checksum:   156656 c6967e9bc5d3c919764b02df24efca01

  Alpha architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_alpha.deb
      Size/MD5 checksum:   165818 92127db2f58390fdbb168c9cf2ccc2ce

  ARM architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_arm.deb
      Size/MD5 checksum:   153160 72b8d81c7c4a9027b508c45fd5d8b39e

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_i386.deb
      Size/MD5 checksum:   150252 2f3905d2923d8ecded2df290762b3c56

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_ia64.deb
      Size/MD5 checksum:   205530 8cfce92a64a7df4c9630f3214aafc9e7

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_hppa.deb
      Size/MD5 checksum:   153204 4e49ebddf0830708fb30a6cc0bfb064b

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_m68k.deb
      Size/MD5 checksum:   146136 45fe19d01f7f76e394a09264bc2f57fb

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_mips.deb
      Size/MD5 checksum:   158316 1b4ad52779b866c71c06f68f1c62e195

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_mipsel.deb
      Size/MD5 checksum:   158310 97c128e30297e62459bd9d277c407b33

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_powerpc.deb
      Size/MD5 checksum:   148476 a7b070e618315e1a45690c701f532435

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_s390.deb
      Size/MD5 checksum:   151256 121b87823b2a3e4ead430bd4c165526e

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/m/metamail/metamail_2.7-45woody.2_sparc.deb
      Size/MD5 checksum:   155234 24e5afafa0c3eb18540267e12651a337


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

- ---------------------------------------------------------------------------------
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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Version: GnuPG v1.2.4 (GNU/Linux)

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=Tsu9
-----END PGP SIGNATURE-----


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