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- ***********************************************************************
- DDN Security Bulletin 9106 DCA DDN Defense Communications System
- 1 May 91 Published by: DDN Security Coordination Center
- (SCC@NIC.DDN.MIL) (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. !
- ! !
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-
-
- 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: cert@cert.sei.cmu.edu
- 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
-
-
-
-