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TUCoPS :: Hacking Techniques :: ca-9901.txt

CERT Advisory 99-01 Trojan TCP Wrappers Tool




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

This message is a re-issue of CERT Advisory CA-99.01, originally
issued on Thursday, January 21, 1999. We are re-issuing this advisory
for several reasons: 

        - The original advisory contained an error. Specifically, we 
        incorrectly said that intruders could gain root access by 
        connecting TO port 421. That is incorrect. The way the Trojan 
        horse is designed, intruders can gain root access by connecting 
        FROM port 421. Our thanks to Jochen Bauer of the Institute for 
        Theoretical Physics at the University of Stuttgart for first 
        identifying this error, 

        - The author and maintainer of the program, Wietse Venema, 
        has moved the official distribution site for TCP Wrappers to a 
        different location,

        - We have provided checksums for individual files to aid sites
        in determining if they have authentic copies. 

CERT Advisory CA-99-01-Trojan-TCP-Wrappers

   Original issue date: January 21, 1999
   Last Revised: January 22, 1998
     _________________________________________________________________
   
   The original release of this advisory contained an error. Please take
   note of the changes mentioned in the revision history section at the
   end of this file.
     _________________________________________________________________
   
Topic: Trojan horse version of TCP Wrappers
     _________________________________________________________________
   
   The CERT Coordination Center has received confirmation that some
   copies of the source code for the TCP Wrappers tool (tcpd) were
   modified by an intruder and contain a Trojan horse.
   
   We strongly encourage sites running the TCP Wrappers tool to
   immediately verify the integrity of their distribution.
     _________________________________________________________________
   
I. Description

   TCP Wrappers is a tool commonly used on Unix systems to monitor and
   filter connections to network services.
   
   The CERT Coordination Center has received confirmation that some
   copies of the file tcp_wrappers_7.6.tar.gz have been modified by an
   intruder and contain a Trojan horse. This file contains the source
   code for TCP Wrappers version 7.6. This Trojan horse appears to have
   been made available on a number of FTP servers since Thursday, January
   21, 1999 at 06:16:00 GMT. Copies downloaded prior to this time are not
   affected by this particular trojan horse.
   
   The Trojan horse version of TCP Wrappers provides root access to
   intruders initiating connections which have a source port of 421.
   Additionally, upon compilation, this Trojan horse version sends email
   to an external address. This email includes information identifying
   the site and the account that compiled the program. Specifically, the
   program sends information obtained from running the commands 'whoami'
   and 'uname -a'.
   
II. Impact

   An intruder can gain unauthorized root access to any host running this
   Trojan horse version of TCP Wrappers.
   
   Note: If you have already installed a Trojan horse version of TCP
   Wrappers, intruders can identify your site using information contained
   in this advisory. Please read the "Solution" section and take
   appropriate action to protect your site as soon as possible.
   
III. Solution

   We encourage sites who downloaded a copy of the TCP Wrapper after
   Thursday, January 21, 1999 at 06:16:00 GMT to verify the authenticity
   of their TCP Wrapper distribution, regardless of where it was
   obtained.
   
   You can use the following MD5 checksums to verify the integrity of
   your TCP Wrappers distribution:
Correct version:
    tcp_wrappers_7.6.tar.gz
        MD5  = e6fa25f71226d090f34de3f6b122fb5a
        size = 99438
    tcp_wrappers_7.6.tar
        MD5  = 5da85a422a30045a62da165404575d8e
        size = 360448

Trojan Horse version:
    tcp_wrappers_7.6.tar.gz
        MD5  = af7f76fb9960a95a1341c1777b48f1df
        size = 99186

   Appendix A provides checksums for the individual files within the
   distribution. It is not sufficient to rely on the timestamps of the
   file when trying to determine whether or not you have a copy of the
   Trojan horse version.
   
   Additionally, the file tcp_wrappers_7.6.tar.gz is distributed with the
   detached PGP signature tcp_wrappers_7.6.tar.gz.sig.
   
   Wietse Venema is the author and maintainer of the TCP Wrappers
   distribution.You can verify the integrity and authenticity of your
   distribution with Wietse Venema's PGP public key. We have included a
   copy of his PGP public key below. Note that the Trojan horse version
   was not signed, and that Wietse Venema's PGP key was not compromised
   in any way.
   
   As a workaround, until you are able to verify your copies of TCP
   Wrappers, you can block inbound connections with a source port of 421
   at your network perimeter. However, it is possible that some operating
   systems or software may use port 421 in legitimate connections. Thus,
   it is possible that some legitimate connections might be blocked.
   
Where to Get TCP Wrappers

   Wietse Venema has moved the primary FTP archive for TCP Wrapper source
   to a different location. The primary archive is now located at
   
     ftp://ftp.porcupine.org/pub/security/
     
   Sites that mirror the TCP Wrapper source code are encouraged to update
   their mirroring procedures.
   
   Wietse Venema expresses his gratitude to his former employer,
   Eindhoven University, for making possible the development and
   distribution of the TCP Wrapper software, and appreciates the support
   from system administrators of the department of mathematics and
   computing science.
   
   Additionally, we have verified that the distribution of TCP Wrappers
   offered by the CERT Coordination Center at ftp.cert.org was not
   involved in this activity. TCP Wrappers is available from our FTP site
   at
   
     ftp://ftp.cert.org/pub/tools/tcp_wrappers/tcp_wrappers_7.6.tar.gz
     MD5 checksum: e6fa25f71226d090f34de3f6b122fb5a
     
Wietse Venema's PGP Public Key


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=+cGX
- -----END PGP PUBLIC KEY BLOCK-----
     _________________________________________________________________
   
Appendix A - Checksums

   This appendix provides checksums for the individual files within the
   TCP Wrappers distribution.
   
   MD5 (BLURB) = 627fc45308e852c446c3606647fa8c34
   MD5 (Banners.Makefile) = e53315d5713278df908248602b129955
   MD5 (CHANGES) = ff08c72b8c9c8d56ba9bf3e90d477639
   MD5 (DISCLAIMER) = 071bd69cb78b18888ea5e3da5c3127fa
   MD5 (Makefile) = 0037774577650534f898949d892144ec
   MD5 (README) = 2452fb4f9d06500ec0634d7b64aaf76b
   MD5 (README.IRIX) = 36603b049d5f89a26a300825c3021310
   MD5 (README.NIS) = 147a07f2d3e673121dec4975849994e8
   MD5 (clean_exit.c) = 1bac137fdc9c151351c0b33c9026421f
   MD5 (diag.c) = 8f3d561785f3314a35a9de09d11ccdaa
   MD5 (environ.c) = 9fa4c0f2fff89d00a4b1283730eab739
   MD5 (eval.c) = b4fbd49308d5a8f77315167a4ee10339
   MD5 (fakelog.c) = b329ab5443158e4c79f55710f9a675d0
   MD5 (fix_options.c) = 99f3cb7841d8bf941bf6750fd7a96df1
   MD5 (fromhost.c) = d880bab3c12c4109e95cdd69470e4ea3
   MD5 (hosts_access.3) = 7993a6a2a27f729254bf29c13f48e9ab
   MD5 (hosts_access.5) = 67085bc60fb9cbb70be7cb6490002923
   MD5 (hosts_access.c) = cec0cba4a2df178e8857510704cc38f3
   MD5 (hosts_ctl.c) = edad608818ee499ad0497dbabad43227
   MD5 (hosts_options.5) = c4920a00f777844c6e8136e52e260264
   MD5 (inetcf.c) = 02ccca613950bfe18706d0c39cbca9ea
   MD5 (inetcf.h) = 2a7ac52919ccece4946943067455b1d8
   MD5 (misc.c) = b74358d00ad758286a44c933fee4eda2
   MD5 (miscd.c) = 720b62d42e8162cb7b696002e56ece6e
   MD5 (mystdarg.h) = ce79d3c00d2ad46db810610c573bce2a
   MD5 (myvsyslog.c) = 619fd9232e456e8ab75625f25dd58952
   MD5 (ncr.c) = dc5262ae64eb1e3305bcfdc00e8fb9c9
   MD5 (options.c) = 8b27d55628eb2b666b27f015ee2182b0
   MD5 (patchlevel.h) = 92e06ff46922390163fdb46af95894f4
   MD5 (percent_m.c) = 721472d1cc7cc8d4960d800057ed8ec1
   MD5 (percent_x.c) = a406be699b48a19fb741fe8f31732698
   MD5 (printf.ck) = 7dafed0315ad74bc7a28e7d747f29819
   MD5 (ptx.c) = 9ab79f1b51877bbeeac82db794b25ad9
   MD5 (refuse.c) = 5f2c0874378f640a86897f5531616dc7
   MD5 (rfc931.c) = e629b1f5cfdc97dc43301ed1186f7c37
   MD5 (safe_finger.c) = 7e4a788b375b7b05a60d24cd0c83b0b3
   MD5 (scaffold.c) = ce9473ec933a5478d3522a15223c48c2
   MD5 (scaffold.h) = 6b9d803d78ec0a6946f329d5a9856b53
   MD5 (setenv.c) = 44209db39c4d3a173d2933b04f67320e
   MD5 (shell_cmd.c) = 57b7371b951329db7b5f699e99798164
   MD5 (socket.c) = 00f0890b1bc3e453ce44ccd64223b0c5
   MD5 (strcasecmp.c) = 1e72db28013fc87fedcdbc155d8ba7fa
   MD5 (tcpd.8) = eaee4abbff9c2853b4e5122ec1fb7a1b
   MD5 (tcpd.c) = a8255a587f31a38b4a7485a5c8d904a3
   MD5 (tcpd.h) = 076cf6456199450a4b81aec77165c716
   MD5 (tcpdchk.8) = ed7b220f6ac7906ae326ac8fa3d04a11
   MD5 (tcpdchk.c) = fe8a07ff2642e8b55922e6be510b9ed3
   MD5 (tcpdmatch.8) = 85bc0335c865954ca534c9a17c666b53
   MD5 (tcpdmatch.c) = 8af6daf4a1e9d9935956f1d31e54ab4f
   MD5 (tli-sequent.c) = 6266612530ec81b4c3f90cbe34fcd108
   MD5 (tli-sequent.h) = 9e8d21063e9157e7c2a4e9e3e3281e8b
   MD5 (tli.c) = 7efc6e3c9915d6e8ca762342b540573d
   MD5 (try-from.c) = c6a00f028c9578a881018b505857a05d
   MD5 (update.c) = 77c218e0e6366d2327f52068f863d12b
   MD5 (vfprintf.c) = 332dc8be89d5a59abc3036b490ba07d0
   MD5 (workarounds.c) = d1e7b5abf95067313b7668d8c10a2c5c
     _________________________________________________________________
   
   The CERT Coordination Center wishes to thank Wietse Venema for his
   assistance in resolving this problem and Roy Arends of CERT-NL for
   valuable input in constructing this advisory. Additionally, we would
   like to thank Jochen Bauer of the Institute for Theoretical Physics at
   the University of Stuttgart for identifying an error in an earlier
   version of this advisory.
   
   Wietse Venema expresses his appreciation to Andrew Brown of Crossbar
   Security, Inc. for noticing that the TCP Wrapper source code had been
   tampered with, and for informing the author of the incident.
   ______________________________________________________________________
   
   This document is available from:
   http://www.cert.org/advisories/CA-99-01-Trojan-TCP-Wrappers.html.
   ______________________________________________________________________
   
CERT/CC Contact Information

   Email: cert@cert.org
          Phone: +1 412-268-7090 (24-hour hotline)
          Fax: +1 412-268-6989
          Postal address:
          CERT Coordination Center
          Software Engineering Institute
          Carnegie Mellon University
          Pittsburgh PA 15213-3890
          U.S.A.
          
   CERT personnel answer the hotline 08:00-20:00 EST(GMT-5) / EDT(GMT-4)
   Monday through Friday; they are on call for emergencies during other
   hours, on U.S. holidays, and on weekends.
   
Using encryption

   We strongly urge you to encrypt sensitive information sent by email.
   Our public PGP key is available from http://www.cert.org/CERT_PGP.key.
   If you prefer to use DES, please call the CERT hotline for more
   information.
   
Getting security information

   CERT publications and other security information are available from
   our web site http://www.cert.org/.
   
   To be added to our mailing list for advisories and bulletins, send
   email to cert-advisory-request@cert.org and include SUBSCRIBE
   your-email-address in the subject of your message.
   
   Copyright 1998 Carnegie Mellon University.
   Conditions for use, disclaimers, and sponsorship information can be
   found in http://www.cert.org/legal_stuff.html.
   
   * CERT is registered in the U.S. Patent and Trademark Office
   ______________________________________________________________________
   
   NO WARRANTY
   Any material furnished by Carnegie Mellon University and the Software
   Engineering Institute is furnished on an "as is" basis. Carnegie
   Mellon University makes no warranties of any kind, either expressed or
   implied as to any matter including, but not limited to, warranty of
   fitness for a particular purpose or merchantability, exclusivity or
   results obtained from use of the material. Carnegie Mellon University
   does not make any warranty of any kind with respect to freedom from
   patent, trademark, or copyright infringement.
     _________________________________________________________________
   
Revision History
Fri January 22, 1999   Modified to reflect that the Trojan horse
                       provides root access to intruders initiating
                       connections from source port of 421 as opposed
                       to a destination port of 421.

                       Added section indicating that the primary FTP
                       archive for TCP Wrapper source has changed.

                       Added an MD5 checksum and size for the correct
                       version of the file tcp_wrappers_7.6.tar.

                       Added MD5 checksums for individual files
                       within the TCP Wrapper distribution.

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