SUMMARY : Break-in? / tcp-wrappers: Socket operation on non

From: Marina.Daniels@cs.tas.gov.au
Date: Sun Jan 24 1999 - 20:21:00 CST


     
     ANSWER
     
     Thanks to:
     SONKO Papa N'Faly
     Bryan Blackburn <blb@pobox.com>
     Alan S H Lam
     
     and anyone that replies after I've sent this message out!
     
     It appears the error message was caused by someone trying to see if we
     had the copy of tcp-wrappers that had been modified to include a
     trojan horse.
This is only a problem if you have installed tcp-wrappers since Thursday,
January 21, 1999 at 06:16:00 GMT (see AUSCERT bulletin below)

ORIGINAL QUESTION:

Is this someone trying to break into my machine?
All of the legitimate users deny doing anything unusual.

My tcp-wrappers is giving me the following error message in
/var/adm/messages
file

tcpd[25492]: warning: can't get client address: Socket operation on
non-socket

and these messages in the tcp-wrappers log file:

Jan 22 14:39:59 tcpd[25380]: refused connect from unknown
Jan 22 14:40:10 tcpd[25492]: warning: can't get client address: Socket
operation
on non-socket
     
===========================================================================
              AUSCERT External Security Bulletin Redistribution
     
                        ESB-1999.006 -- CERT CA-99-01
                             Trojan-TCP-Wrappers
                               22 January 1999
     
===========================================================================
     
The CERT Coordination Centre 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.
     
The Trojan horse version of TCP Wrappers provides root access to intruders
on port 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.
     
- --------------------------BEGIN INCLUDED TEXT--------------------
     
- -----BEGIN PGP SIGNED MESSAGE-----
     
CERT Advisory CA-99-01-Trojan-TCP-Wrappers
     
   Original issue date: January 21, 1999
     
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.
     
   The Trojan horse version of TCP Wrappers provides root access to
   intruders on port 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 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 the
   TCP Wrappers file:
File: tcp_wrappers_7.6.tar.gz
     
    Correct version:
    size 99438 MD5 e6fa25f71226d090f34de3f6b122fb5a
     
    Trojan Horse version:
    size 99186 MD5 af7f76fb9960a95a1341c1777b48f1df
     
   Note that it is not sufficient to rely on the timestamps of the file
   when trying to determine if 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.
     
   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
     
   As with any port, if you are not using port 421, we encourage you to
   filter it at your network perimeter.
     
Wietse Venema's PGP Public Key
     
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     _________________________________________________________________
     
   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.
   ______________________________________________________________________
     
   This document is available from:
   http://www.cert.org/advisories/CA-99-01-Trojan-TCP-Wrappers.html.
   ______________________________________________________________________
     
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Revision History
     
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This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.
     
NOTE: This is only the original release of the security bulletin. It will
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.
     
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
     
Previous advisories and external security bulletins can be retrieved from:
     
        http://www.auscert.org.au/Information/advisories.html
     
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).
     
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for emergencies.
     
     
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