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Security Bulletin 9315 DISA Defense Communications System
August 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-93:11 CERT Advisory
August 9, 1993
UMN UNIX gopher and gopher+ Vulnerabilities
---------------------------------------------------------------------------
The CERT Coordination Center has received information concerning
vulnerabilities in versions of the UMN UNIX gopher and gopher+ server and
client available before August 6, 1993. Vulnerable versions were available on
boombox.micro.umn.edu:/pub/gopher/Unix/gopher1.12s.tar.Z,
boombox.micro.umn.edu:/pub/gopher/Unix/gopher2.03.tar.Z, and many other
anonymous FTP sites mirroring these software versions.
We strongly recommend that any site using versions of UMN UNIX gopher
and gopher+ dated prior to August 6, 1993 (including version 1.12, 1.12s,
2.0+, 2.03, and all earlier versions) immediately take corrective action.
If you have further questions regarding UMN UNIX gopher or gopher+ software,
send e-mail to: gopher@boombox.micro.umn.edu
---------------------------------------------------------------------------
I. Description
Several vulnerabilities have been identified in UMN UNIX gopher and
gopher+ when configured as a server or public access client.
Intruders are known to have exploited these vulnerabilities to obtain
password files. Other actions may also have been taken by intruders
exploiting these vulnerabilities. CERT has already contacted those
sites currently known to have been victims of these activities. However,
sites may want to check for weak passwords, or consider changing
passwords, after installing the new gopher software.
II. Impact
Anyone (remote or local) can potentially gain unrestricted access
to the account running the public access client, thereby permitting
them to read any files accessible to this account (possibly including
/etc/passwd or other sensitive files).
In certain configurations, anyone (remote or local) can potentially
gain access to any account, including root, on a host configured as a
server running gopherd.
III. Solution
Affected sites should consider disabling gopherd service and public gopher
logins until they have installed the new software.
New versions of the UMN UNIX gopher and gopher+ software have been
released that provide bug fixes and correct these security problems.
Sites can obtain these new versions via anonymous FTP from
boombox.micro.umn.edu (134.84.132.2). The files are located in:
Filename Size Checksum
-------- ------ -----------
Gopher:
/pub/gopher/Unix/gopher1.12S.tar.Z 306872 46311 300
Gopher+:
/pub/gopher/Unix/gopher2.04.tar.Z 294872 29411 288
---------------------------------------------------------------------------
The CERT Coordination Center wishes to thank Matt Schroth, Williams College,
and others for informing us of these vulnerabilities. We would also like to
thank Paul Lindner, University of Minnesota, for his quick response to these
problems.
---------------------------------------------------------------------------
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 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 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. *
* *
****************************************************************************