CERT Advisory - wuarchive ftpd Trojan Horse
CERT Advisory
cert-advisory-request at cert.org
Wed Apr 6 16:51:16 UTC 1994
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CA-94:07 CERT Advisory
April 6, 1994
wuarchive ftpd Trojan Horse
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The CERT Coordination Center has received confirmation that some copies
of the source code for the wuarchive FTP daemon (ftpd) were modified by
an intruder, and contain a Trojan horse.
We strongly recommend that any site running the wuarchive ftpd take steps
to immediately install version 2.3, or disable their FTP daemon.
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I. Description
Some copies of the source code for versions 2.2 and 2.1f of the
wuarchive ftpd were modified by an intruder, and contain a Trojan
horse. If your FTP daemon was compiled from the intruder-modified
source code, you are vulnerable.
It is possible that previous versions of the source code for the server
were modified in a similar manner.
If you are running the wuarchive ftpd, but not providing anonymous FTP
access, you are still vulnerable to this Trojan horse.
II. Impact
An intruder can gain root access on a host running an FTP daemon
that contains this Trojan horse.
III. Solution
We strongly recommend that any site running the wuarchive ftpd (version
2.2 or earlier) take steps to immediately install version 2.3.
If you cannot install the new version in a timely manner, you should
disable FTP service. It is not sufficient to disable anonymous FTP.
You must disable the FTP daemon.
Sites can obtain version 2.3 via anonymous FTP from ftp.uu.net, in the
"/networking/ftp/wuarchive-ftpd" directory. We recommend that you turn
off your FTP server until you have installed the new version.
Be certain to verify the checksum information to confirm that you have
retrieved a valid copy.
BSD SVR4
File Checksum Checksum MD5 Digital Signature
----------------- -------- --------- --------------------------------
wu-ftpd-2.3.tar.Z 24416 181 30488 361 e58adc5ce0b6eae34f3f2389e9dc9197
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The CERT Coordination Center wishes to thank Bryan O'Connor and Chris Myers
of Washington University in St. Louis for their invaluable assistance in
resolving this problem. CERT also gratefully acknowledges the help of
Neil Woods and Karl Strickland.
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If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident
Response and Security Teams (FIRST).
If you wish to send sensitive incident or vulnerability information to
CERT via electronic mail, CERT strongly advises that the e-mail be encrypted.
CERT can support a shared DES key, PGP (public key available via
anonymous FTP on info.cert.org), or PEM (contact CERT for details).
Internet E-mail: cert at cert.org
Telephone: 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4),
and are on call for emergencies during other hours.
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Past advisories, information about FIRST representatives, and other
information related to computer security are available via anonymous
FTP from info.cert.org.
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