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Category:   Application (E-mail Server)  >   sSMTP Vendors:   Collier-Brown, David et al
(Debian Issues Fix) sSMTP Format String Flaws Let Remote Servers Execute Arbitrary Code
SecurityTracker Alert ID:  1009790
SecurityTracker URL:  http://securitytracker.com/id/1009790
CVE Reference:   CVE-2004-0156   (Links to External Site)
Date:  Apr 15 2004
Impact:   Execution of arbitrary code via network, Root access via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.50.6.1
Description:   Two format string vulnerabilities were reported in ssmtp. A remote mail relay may be able to execute arbitrary code with the privileges of the ssmtp process.

Debian reported that the software passes user-supplied values as format strings to the die() and log_event() functions. A remote user (as a mail relay) can supply specially crafted values to execute arbitrary code on the target system.

Max Vozeler is credited with discovering these flaws.

Impact:   A remote server can execute arbitrary code on the target system with the privileges of the ssmtp process, which may be root level privileges on some systems.
Solution:   Debian has released a fix for the stable version.

Debian GNU/Linux 3.0 alias woody:

Source archives:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1.dsc
Size/MD5 checksum: 452 c36084c67873e0881794278c0be140c5
http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1.tar.gz
Size/MD5 checksum: 139907 eb45734311f00894e6b135c8fafb7c9a

Alpha architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_alpha.deb
Size/MD5 checksum: 29388 9b7b4fb95fa15cb68dda2feb4750bd0d

ARM architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_arm.deb
Size/MD5 checksum: 27068 cce2793db67d3e2c15bdbf562b7d9701

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_i386.deb
Size/MD5 checksum: 26288 ba0326f0d192bb059cb2b205a8a1420c

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_ia64.deb
Size/MD5 checksum: 33312 3d44b78e280f79ce80bd9af6f2ee36c1

HP Precision architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_hppa.deb
Size/MD5 checksum: 26742 74b56161785b972bf60b30a580b1b75f

Motorola 680x0 architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_m68k.deb
Size/MD5 checksum: 25870 845aec84ff6a0bda0d41c9408aa6db35

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_mips.deb
Size/MD5 checksum: 27346 fd8ffe053e266e1209dd821209e03051

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_mipsel.deb
Size/MD5 checksum: 27340 7549f22f6bcf6c6adfd9caf1aac1f5da

PowerPC architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_powerpc.deb
Size/MD5 checksum: 26182 5113c9871cae26e5cd24ca01dd5db30b

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_s390.deb
Size/MD5 checksum: 26984 3a8dd685a65f9b4e84f1025168fdfa3a

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_sparc.deb
Size/MD5 checksum: 29152 d4460c1db6fd727129a576329136866d

Vendor URL:  www.debian.org/security/ (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Debian)
Underlying OS Comments:  3.0

Message History:   This archive entry is a follow-up to the message listed below.
Apr 15 2004 sSMTP Format String Flaws Let Remote Servers Execute Arbitrary Code



 Source Message Contents

Subject:  [SECURITY] [DSA 485-1] New ssmtp packages fix format string vulnerabilities


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

- --------------------------------------------------------------------------
Debian Security Advisory DSA 485-1                     security@debian.org
http://www.debian.org/security/                             Matt Zimmerman
April 14th, 2004                         http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : ssmtp
Vulnerability  : format string
Problem-Type   : remote
Debian-specific: no
CVE Ids        : CAN-2004-0156

Max Vozeler discovered two format string vulnerabilities in ssmtp, a
simple mail transport agent.  Untrusted values in the functions die()
and log_event() were passed to printf-like functions as format
strings.  These vulnerabilities could potentially be exploited by a
remote mail relay to gain the privileges of the ssmtp process
(including potentially root).

For the current stable distribution (woody) this problem will be fixed
in version 2.50.6.1.

For the unstable distribution (sid), this problem will be fixed soon.

We recommend that you update your ssmtp 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/s/ssmtp/ssmtp_2.50.6.1.dsc
      Size/MD5 checksum:      452 c36084c67873e0881794278c0be140c5
    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1.tar.gz
      Size/MD5 checksum:   139907 eb45734311f00894e6b135c8fafb7c9a

  Alpha architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_alpha.deb
      Size/MD5 checksum:    29388 9b7b4fb95fa15cb68dda2feb4750bd0d

  ARM architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_arm.deb
      Size/MD5 checksum:    27068 cce2793db67d3e2c15bdbf562b7d9701

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_i386.deb
      Size/MD5 checksum:    26288 ba0326f0d192bb059cb2b205a8a1420c

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_ia64.deb
      Size/MD5 checksum:    33312 3d44b78e280f79ce80bd9af6f2ee36c1

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_hppa.deb
      Size/MD5 checksum:    26742 74b56161785b972bf60b30a580b1b75f

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_m68k.deb
      Size/MD5 checksum:    25870 845aec84ff6a0bda0d41c9408aa6db35

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_mips.deb
      Size/MD5 checksum:    27346 fd8ffe053e266e1209dd821209e03051

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_mipsel.deb
      Size/MD5 checksum:    27340 7549f22f6bcf6c6adfd9caf1aac1f5da

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_powerpc.deb
      Size/MD5 checksum:    26182 5113c9871cae26e5cd24ca01dd5db30b

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_s390.deb
      Size/MD5 checksum:    26984 3a8dd685a65f9b4e84f1025168fdfa3a

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/s/ssmtp/ssmtp_2.50.6.1_sparc.deb
      Size/MD5 checksum:    29152 d4460c1db6fd727129a576329136866d

  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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=5kei
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