CA-93:06 CERT Advisory

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CA-93:06 CERT Advisory
April 9, 1993
wuarchive ftpd Vulnerability

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The CERT Coordination Center has received information concerning a
vulnerability in versions of wuarchive ftpd available before April 8,
1993. Vulnerable wuarchive ftpd versions were available from
wuarchive.wustl.edu:/packages/ftpd.wuarchive.shar and many other
anonymous FTP sites.

We strongly recommend that any site using versions of wuarchive ftpd
dating prior to April 8, 1993, immediately take corrective action or
remove this service.

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I. Description

A vulnerability exists in the access control mechanism in this
version of ftpd.

II. Impact

Anyone (remote or local) can potentially gain access to any
account including root on a host running this version of ftpd.

III. Solution

Affected sites may choose to disable anonymous FTP service until
they have corrected this problem.

Affected sites can correct this problem through one of the
following two procedures:

A. A new version of ftpd has been released that provides new features
and also fixes this security problem. Sites can obtain this new
version via anonymous FTP from wuarchive.wustl.edu (128.252.135.4).
The files are located in:

Size Checksum
/packages/wuarchive-ftpd/wu-ftpd-2.0.shar 421953 08786
/packages/wuarchive-ftpd/wu-ftpd-2.0.tar 491520 27466

B. Make modifications to your existing wuarchive ftpd sources using
the diff output provided below, recompile and install according to
the instructions provided.

*** ftpd.c.orig
- --- ftpd.c
***************
*** 413,418 ****
- --- 413,420 ----
end_login();
}

+ anonymous = 0;
+
if (!strcasecmp(name, "ftp") || !strcasecmp(name, "anonymous")) {
if (checkuser("ftp") || checkuser("anonymous")) {
reply(530, "User %s access denied.", name);

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The CERT Coordination Center wishes to thank Scott Paisley, Computer Systems
Support Manager, Factory Automated Systems Division, N.I.S.T., for informing
us of this vulnerability. We would also like to thank Chris Myers, Washington
University, for his quick response to this problem.
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If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in FIRST (Forum of Incident
Response and Security Teams).

Internet E-mail: [email protected]
Telephone: 412-268-7090 (24-hour hotline)
CERT personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
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 for anonymous FTP
from cert.org (192.88.209.5).

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