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                         The U.S. Department of Energy
                     Computer Incident Advisory Capability
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			       Advisory Notice

			 wuarchive ftpd Trojan Horse

April 6, 1994 1640 PST                                            Number E-14
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PROBLEM:  Some copies of wuarchive FTP daemon (ftpd) source have been modified
          and contain a Trojan horse.
PLATFORM: UNIX machines running wuarchive ftpd version 2.2 or earlier.
DAMAGE:   Root access may be obtained.
SOLUTION: Disable the wuarchive ftpd, then retrieve and install wuarchive ftpd
          version 2.3 
ASSESSMENT OF VULNERABILITY: Intruders have used this Trojan horse to obtain
          root access to computers on the Internet.
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	    Critical Information about wuarchive ftpd Trojan Horse

CIAC has received information that some copies of of the wuarchive FTP daemon
(ftpd) versions 2.2 and 2.1f have been modified at the source code level to
contain a Trojan horse.  This Trojan allows any user, local or remote, to
become root on the affected UNIX system.

CIAC strongly recommends that all sites running these or older versions of the
wuarchive ftpd retrieve and install version 2.3.  It is possible that versions
previous to 2.2 and 2.1f contain the Trojan as well.

If the new version cannot be installed in a timely manner, all FTP service
should be disabled, since this Trojan affects all systems that are running the
wuarchive ftpd, whether or not the system provides anonymous ftp service.

Sites can obtain version 2.3 via anonymous FTP from ftp.uu.net, in the file
/networking/ftp.wuarchive-ftpd/wu-ftpd-2.3.tar.Z.  The BSD Checksum for this
file is 24416 181, the SVR4 Checksum for this file is 30488 361, and the MD5
Digital Signature is e58adc5ce0b6eae34f3f2389e9dc9197.

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For additional information or assistance, please contact CIAC:
    Voice:   510-422-8193
    FAX:     510-423-8002
    STU-III: 510-423-2604
    E-mail:  ciac@llnl.gov

Previous CIAC Bulletins and other information are available via anonymous FTP
from irbis.llnl.gov (IP address 128.115.19.60).
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        set  (service)  address  (PIN)  (distribution_list_address)
______________________________________________________________________________

CIAC wishes to acknowledge and thank the contribution of the CERT Coordination
Center for their timely advisory on this vulnerability.
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PLEASE NOTE: Many users outside of the DOE and ESnet computing communities
receive CIAC bulletins.  If you are not part of these communities, please
contact your agency's response team to report incidents.  Your agency's team
will coordinate with CIAC.  The Forum of Incident Response and Security Teams
(FIRST) is a world-wide organization.  A list of FIRST member organizations
and their constituencies can be obtained by sending E-mail to
first-request@first.org with an empty subject line and a message body
containing the line: send first-contacts.

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