DDN Security Bulletin 9106 DCA DDN Defense Communications System

***********************************************************************
DDN Security Bulletin 9106 DCA DDN Defense Communications System
1 May 91 Published by: DDN Security Coordination Center
([email protected]) (800) 235-3155

DEFENSE DATA NETWORK
SECURITY BULLETIN

The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
Coordination Center) under DCA contract as a means of communicating
information on network and host security exposures, fixes, & concerns
to security & management personnel at DDN facilities. Back issues may
be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.67.67.20]
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-9001).
**********************************************************************

DEC Ultrix chroot Vulnerability

+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
! !
! The following important advisory was issued by the Computer !
! Emergency Response Team (CERT) and is being relayed unedited !
! via the Defense Communications Agency's Security Coordination !
! Center distribution system as a means of providing DDN !
! subscribers with useful security information. !
! !
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +

CA-91:05 CERT Advisory
May 1, 1991
DEC Ultrix chroot Vulnerability

---------------------------------------------------------------------------

The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning a vulnerability in Digital Equipment
Corporation's (DEC) Ultrix operating system versions 4.0 and 4.1 for all
DEC architectures. The vulnerability has been fixed in version 4.2 which
will be shipped beginning in late May. DEC has also provided a suggested
fix for versions 4.0 and 4.1.

---------------------------------------------------------------------------
I. DESCRIPTION:
By default, /usr/bin/chroot is improperly installed in Ultrix
versions 4.0 and 4.1.

II. IMPACT:
System users can gain unauthorized privileges.

III. SOLUTION:
Change the permission on the file /usr/bin/chroot.

# chmod 700 /usr/bin/chroot

---------------------------------------------------------------------------
Our thanks to Eric R. Jorgensen and Brian Ellis of UnixOps / Distributed
Computing Services at the University of Colorado, Boulder, for bringing this
problem to our attention. The CERT/CC would also like to thank Digital for
their response to this vulnerability.
---------------------------------------------------------------------------

If you believe that your system has been compromised, contact CERT/CC via
telephone or e-mail.

Computer Emergency Response Team/Coordination Center (CERT/CC)
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890

Internet E-mail: [email protected]
Telephone: 412-268-7090 24-hour hotline:
CERT/CC personnel answer 7:30a.m.-6:00p.m. EST,
on call for emergencies during other hours.

Past advisories and other computer security related information are available
for anonymous ftp from the cert.sei.cmu.edu (128.237.253.5) system.
Organization: National Institute of Standards and Technology (NIST)
Sub-Organization: National Computer Systems Laboratory

Downloaded From P-80 International Information Systems 304-744-2253