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**************************************************************************
Security Bulletin 9309 DISA Defense Communications System
April 9, 1993 Published by: DDN Security Coordination Center
(SCC@NIC.DDN.MIL) 1-(800) 365-3642
DEFENSE DATA NETWORK
SECURITY BULLETIN
The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
Coordination Center) under DISA contract as a means of communicating
information on network and host security exposures, fixes, and concerns
to security and management personnel at DDN facilities. Back issues may
be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5]
using login="anonymous" and password="guest". The bulletin pathname is
scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
and "nn" is a bulletin number, e.g. scc/ddn-security-9302).
**************************************************************************
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
! !
! The following important advisory was issued by the Computer !
! Emergency Response Team (CERT) and is being relayed unedited !
! via the Defense Information Systems Agency's Security !
! Coordination Center distribution system as a means of !
! providing DDN subscribers with useful security information. !
! !
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
===========================================================================
CA-93:06 CERT Advisory
April 9, 1993
wuarchive ftpd Vulnerability
---------------------------------------------------------------------------
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.
---------------------------------------------------------------------------
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);
---------------------------------------------------------------------------
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.
---------------------------------------------------------------------------
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: cert@cert.org
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).
****************************************************************************
* *
* The point of contact for MILNET security-related incidents is the *
* Security Coordination Center (SCC). *
* *
* E-mail address: SCC@NIC.DDN.MIL *
* *
* Telephone: 1-(800)-365-3642 *
* *
* NIC Help Desk personnel are available from 7:00 a.m.-7:00 p.m. EST, *
* Monday through Friday except on federal holidays. *
* *
****************************************************************************