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Category:   Application (File Transfer/Sharing)  >   oftpd Vendors:   Kerr, Shane et al
(Debian Issues Fix) oftpd Can Be Crashed By Remote Users Sending a PORT Command
SecurityTracker Alert ID:  1009657
SecurityTracker URL:  http://securitytracker.com/id/1009657
CVE Reference:   CVE-2004-0376   (Links to External Site)
Date:  Apr 4 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.3.6
Description:   A denial of service vulnerability was reported in oftpd. A remote user can cause the server to crash.

Philippe Oechslin reported that a remote user can cause the FTP service to crash by sending an FTP PORT command with a port number higher than 255. The oftpd daemon will then crash and must be manually restarted to return to normal operations.

As a demonstration exploit, the report indicates that you can telnet to the target FTP service on TCP port 21 and then type "port 300" with a return to cause the FTP service to crash.

Andreas Rueegg and Philippe Oechslin of the Security Bug Catcher project (http://lasecwww.epfl.ch/philippe.shtml) are credited with discovery.

Impact:   A remote user can cause the oftpd daemon to crash. The daemon must be manually restarted to return to normal operations.
Solution:   Debian has released a fix for the stable distribution (woody) in version 0.3.6-6 and for the unstable distribution (sid) in version 20040304-1.

Debian GNU/Linux 3.0 alias woody:

Source archives:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6.dsc
Size/MD5 checksum: 582 ec0796ba52c95ba4ee83414917b656c4
http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6.diff.gz
Size/MD5 checksum: 49463 329930f2d835f6c754b6c79a496f038a
http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6.orig.tar.gz
Size/MD5 checksum: 77201 78b4139bb0108297b9814564db986852

Alpha architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_alpha.deb
Size/MD5 checksum: 46166 cea2315f6960525ac9c113510f20dfbc

ARM architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_arm.deb
Size/MD5 checksum: 40084 28fb6ba5082855444980ca611e8429c0

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_i386.deb
Size/MD5 checksum: 38442 32cacf8eb9d37a8406302811ac3d62ac

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_ia64.deb
Size/MD5 checksum: 53688 3142a68ecc08c448e082d339812796c8

HP Precision architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_hppa.deb
Size/MD5 checksum: 42828 eef0881c474cce76cdf012ac797b8203

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_mips.deb
Size/MD5 checksum: 39898 316629cf18ed8906ea09b84140ecf64c

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_mipsel.deb
Size/MD5 checksum: 39976 1e6fc0b5f9c402d15541f8d5bd6a36a9

PowerPC architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_powerpc.deb
Size/MD5 checksum: 39434 a712ef00a8bc169f4bfd319583367f59

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_s390.deb
Size/MD5 checksum: 38824 eb1405f335b5344b43b7617ee9b1ecfd

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_sparc.deb
Size/MD5 checksum: 42250 15668b00038e349cbf6b0331d791532d

Vendor URL:  www.time-travellers.org/oftpd/oftpd-dos.html (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.
Mar 29 2004 oftpd Can Be Crashed By Remote Users Sending a PORT Command



 Source Message Contents

Subject:  [SECURITY] [DSA 473-1] New oftpd packages fix denial of service



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

- --------------------------------------------------------------------------
Debian Security Advisory DSA 473-1                     security@debian.org
http://www.debian.org/security/                             Matt Zimmerman
April 3rd, 2004                         http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : oftpd
Problem-Type   : denial of service
Debian-specific: no
CVE Ids        : CAN-2004-0376
Debian bug     : 216871

A vulnerability was discovered in oftpd, an anonymous FTP server,
whereby a remote attacker could cause the oftpd process to crash by
specifying a large value in a PORT command.

For the stable distribution (woody) this problem has been fixed in
version 0.3.6-6.

For the unstable distribution (sid) these problems have been fixed in
version 20040304-1.

We recommend that you update your oftpd 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/o/oftpd/oftpd_0.3.6-6.dsc
      Size/MD5 checksum:      582 ec0796ba52c95ba4ee83414917b656c4
    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6.diff.gz
      Size/MD5 checksum:    49463 329930f2d835f6c754b6c79a496f038a
    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6.orig.tar.gz
      Size/MD5 checksum:    77201 78b4139bb0108297b9814564db986852

  Alpha architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_alpha.deb
      Size/MD5 checksum:    46166 cea2315f6960525ac9c113510f20dfbc

  ARM architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_arm.deb
      Size/MD5 checksum:    40084 28fb6ba5082855444980ca611e8429c0

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_i386.deb
      Size/MD5 checksum:    38442 32cacf8eb9d37a8406302811ac3d62ac

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_ia64.deb
      Size/MD5 checksum:    53688 3142a68ecc08c448e082d339812796c8

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_hppa.deb
      Size/MD5 checksum:    42828 eef0881c474cce76cdf012ac797b8203

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_mips.deb
      Size/MD5 checksum:    39898 316629cf18ed8906ea09b84140ecf64c

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_mipsel.deb
      Size/MD5 checksum:    39976 1e6fc0b5f9c402d15541f8d5bd6a36a9

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_powerpc.deb
      Size/MD5 checksum:    39434 a712ef00a8bc169f4bfd319583367f59

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_s390.deb
      Size/MD5 checksum:    38824 eb1405f335b5344b43b7617ee9b1ecfd

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/o/oftpd/oftpd_0.3.6-6_sparc.deb
      Size/MD5 checksum:    42250 15668b00038e349cbf6b0331d791532d

  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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