-----BEGIN PGP SIGNED MESSAGE----- CA-91:05 CERT Advisory May 1, 1991 DEC Ultrix 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.org 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.org (192.88.209.5) system. -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBMaMwpXVP+x0t4w7BAQF+6gP+MumrUomg73uZogKoTCHE5aWhtQPoD23d nejZPexA9Dqld1A7A0IPseT9TaAtyDHVfjjaM0XbcwT5NrAAQKUDp8j1FmRvhzOU S3bh5G/ntsTPzAYF1+QrfkxemU6zZvMkfc1+4584TPN27Gh4vmxJ4UvxWXeq8nlu F06qNBhynL0= =gWTW -----END PGP SIGNATURE-----