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CERT* Vendor-Initiated Bulletin VB-98.10
October 13, 1998
Topic: Security Vulnerabilities in "mscreen" Serial Multiscreens Utility
Source: SCO
To aid in the wide distribution of essential security information, the CERT
Coordination Center is forwarding the following information from SCO.
SCO urges you to act on this information as soon as possible. SCO contact
information is included in the forwarded text below; please contact them if
you have any questions or need further information.
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SCO Security Bulletin 98.05
October 6, 1998
Security Vulnerabilities in "mscreen" Serial Multiscreens Utility
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I. Description
Security vulnerabilities have been discovered in the SCO "mscreen"
serial multiscreens utility.
II. Impact
The vulnerabilities could allow local users to gain root privileges.
An exploit script for one of the vulnerabilities has been published,
so we recommend that the patch described below be installed on all
affected systems as soon as possible.
III. Releases
This problem exists on the following releases of SCO operating systems:
- SCO Open Desktop/Open Server 3.0 (all, also SCO UNIX 3.2v4)
- SCO OpenServer 5.0 (all, also SCO Internet FastStart)
- SCO CMW+ 3.0
Other SCO products are not affected.
IV. Solution
For SCO CMW+, the mscreen utility is non-functional; however, a binary
is installed on the system with the set-user-id attribute. This should
be disabled by executing the following command logged in as root:
# chmod 0 /usr/bin/mscreen
For SCO OpenServer 5 and SCO Open Desktop/Open Server 3, SCO is providing
an interim patch to address this issue in the form of a System Security
Enhancement (SSE) package.
SSE016 contains new versions of the mscreen binary for each system type.
It is available for Internet download via anonymous ftp, and from the
SCOFORUM on Compuserve.
You can download the SSE package as follows:
Anonymous ftp (World Wide Web URL):
ftp://ftp.sco.COM/SSE/sse016.ltr (cover letter, ASCII text)
ftp://ftp.sco.COM/SSE/sse016.tar.Z (new binaries, compressed tar file)
Compuserve:
GO SCOFORUM, and search Library 11 (SLS/SSE Files) for these filenames:
SSE016.LTR (cover letter, ASCII text)
SSE016.TAZ (new binaries, compressed tar file)
Checksums (sum -r):
15726 5 sse016.ltr
31228 64 sse016.tar.Z
V. Updates
This bulletin is available for anonymous ftp download from
ftp://ftp.sco.COM/SSE/security_bulletins/SB-98.05a, and will be
updated as new information becomes available.
The latest information on security vulnerabilities and fixes from
SCO is available on the world-wide web at http://www.sco.com/security/
VI. Further Information:
If you have further questions, contact your support provider. If you
need to contact SCO, please send electronic mail to This email address is being protected from spambots. You need JavaScript enabled to view it., or
contact SCO as follows.
USA/Canada: 6am-5pm Pacific Time (PST/PDT)
-----------
1-800-347-4381 (voice)
1-408-427-5443 (fax)
Pacific Rim, Asia, and Latin American customers: 6am-5pm Pacific
------------------------------------------------ Time (PST/PDT)
1-408-425-4726 (voice)
1-408-427-5443 (fax)
Europe, Middle East, Africa: 9am-5:30pm UK Time (GMT/BST)
----------------------------
+44 (0)1923 816344 (voice)
+44 (0)1923 817781 (fax)
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If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident Response
and Security Teams (FIRST). See http://www.first.org/team-info/.
We strongly urge you to encrypt any sensitive information you send by email.
The CERT Coordination Center can support a shared DES key and PGP. Contact
the CERT staff for more information.
Location of CERT PGP key
ftp://ftp.cert.org/pub/CERT_PGP.key
CERT Contact Information
- ------------------------
Email This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone +1 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30-5:00 p.m. EST
(GMT-5)/EDT(GMT-4), and are on call for
emergencies during other hours.
Fax +1 412-268-6989
Postal address
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890
USA
CERT publications, information about FIRST representatives, and other
security-related information are available from
http://www.cert.org/
ftp://ftp.cert.org/pub/
CERT advisories and bulletins are also posted on the USENET newsgroup
comp.security.announce
To be added to our mailing list for CERT advisories and bulletins, send your
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This email address is being protected from spambots. You need JavaScript enabled to view it.
In the subject line, type
SUBSCRIBE your-email-address
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This file: ftp://ftp.cert.org/pub/cert_bulletins/VB-98.10.sco.mscreen
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