__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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/ | /_\ /
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__________________________________________________________
INFORMATION BULLETIN
SCO Kernel Security Vulnerability
June 18, 1996 16:00 GMT Number G-27
______________________________________________________________________________
PROBLEM: A problem in the kernel error handling routine.
PLATFORM: Platforms running the following versions: SCO OpenServer 5,
SCO OpenServer 5.0.2, SCO Internet FastStart 1.0
DAMAGE: A user with an account on the system may be able to gain
unauthorized root access.
SOLUTION: See the attached SCO bulletin below for more information on
patch availability.
______________________________________________________________________________
VULNERABILITY Knowledge of how to exploit this vulnerability is becoming
ASSESSMENT: widely known.
______________________________________________________________________________
CIAC has obtained information from Santa Cruz Operation, Inc. (SCO) pertaining
to the vulnerability of the kernel error handling routine. CIAC recommends
that you install the proper patch to eliminate this problem.
[Start of SCO Bulletin]
===========================================================================
SCO Security Bulletin 96:001
June 7, 1996
Patch for kernel security issue
- - ---------------------------------------------------------------------------
The Santa Cruz Operation has discovered the following problem present in
our Software:
I. Description
A problem in a kernel error handling routine may allow unauthorized
root access to the system.
II. Impact
Any user with an account on the system may be able to gain root
access by forcibly causing a particular kernel error handling routine
to be executed. To gain access would require that the user intentionally
write and then execute a program to exploit this problem. Alternatively,
a user could unintentionally allow root access by executing a program
previously written to take advantage of the problem.
III. Releases
This problem exists on the following releases of SCO Products:
SCO OpenServer 5
SCO OpenServer 5.0.2
SCO Internet FastStart 1.0
IV. Solution
SCO is providing the following (S)upport (L)evel (S)upplement
to address the issue. It is recommended that all systems installed
with one of the above releases also have SLS oss436a installed.
SLS oss436a is available as follows:
Anonymous ftp:
- - --------------
ftp://ftp.sco.COM/SLS/oss436a.Z (patch disk)
ftp://ftp.sco.COM/SLS/oss436a.ltr.Z (cover letter/install notes)
UUCP:
- - -----
This SLS is also available to be downloaded via UUCP from the following
machines:
sosco (USA)
scolon (United Kingdom)
The file names are:
/usr/spool/uucppublic/SLS/oss436a.Z
/usr/spool/uucppublic/SLS/oss436a.ltr.Z
Telephone numbers and login names for UUCP are provided in the
default /usr/lib/uucp/Systems file that ships with every SCO Operating
System.
Compuserve:
- - -----------
SLS oss436a is also available in Library 11 in the SCO Forum
on Compuserve.
SCO Online Support (SOS) BBS:
- - -----------------------------
SLS oss436 can also be downloaded interactively via X, Y, Z MODEM or Kermit,
using the SCO Online Support System (SOS). Follow the menus selections under
"Toolchest" from the main SOS menu.
List of phone numbers available for interactive transfer from SOS are:
1-408-426-9495 (USA)
+44 (0)1923 210 888 (United Kingdom)
Checksums:
- - ----------
MD5:
MD5 (oss436a.Z) = e1e76be4486958b64c996cd3a8a1a4ff
MD5 (oss436a.ltr.Z) = bbe35e5e4109b4f547757a37ab40f47b
sum -r:
06102 43 oss436a.Z
54199 5 oss436a.ltr.Z
Please note that these files are compressed. You must use the uncompress(C)
command on these files before following the installation instructions in
the resultant oss436a.ltr file.
If you have further questions, contact your support provider. If you
need to contact SCO, please send electronic mail to support@sco.COM, or
contact SCO as follows.
USA/Canada: 6am-5pm Pacific Daylight Time (PDT)
-----------
1-800-347-4381 (voice)
1-408-427-5443 (fax)
Pacific Rim, Asia, and Latin American customers: 6am-5pm Pacific
------------------------------------------------ Daylight Time
(PDT)
1-408-425-4726 (voice)
1-408-427-5443 (fax)
Europe, Middle East, Africa: 9am-5:30pm Greenwich Mean Time (GMT)
----------------------------
+44 (0)1923 816344 (voice)
+44 (0)1923 817781 (fax)
[End of SCO Bulletin]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Santa Cruz Operation (SCO) for
the information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 510-422-8193
FAX: +1 510-423-8002
STU-III: +1 510-423-2604
E-mail: ciac@llnl.gov
For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 510-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://ciac.llnl.gov/
Anonymous FTP: ciac.llnl.gov (128.115.19.53)
Modem access: +1 (510) 423-4753 (28.8K baud)
+1 (510) 423-3331 (28.8K baud)
CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
information and Bulletins, important computer security information;
2. CIAC-NOTES for Notes, a collection of computer security articles;
3. SPI-ANNOUNCE for official news about Security Profile Inspector
(SPI) software updates, new features, distribution and
availability;
4. SPI-NOTES, for discussion of problems and solutions regarding the
use of SPI products.
Our mailing lists are managed by a public domain software package
called ListProcessor, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
CIAC-BULLETIN, CIAC-NOTES, SPI-ANNOUNCE or SPI-NOTES for list-name and
valid information for LastName FirstName and PhoneNumber when sending
E-mail to ciac-listproc@llnl.gov:
subscribe list-name LastName, FirstName PhoneNumber
e.g., subscribe ciac-notes OHara, Scarlett W. 404-555-1212 x36
You will receive an acknowledgment containing address, initial PIN,
and information on how to change either of them, cancel your
subscription, or get help.
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained by sending email to
docserver@first.org with an empty subject line and a message body
containing the line: send first-contacts.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
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otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.
LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)
G-17: Vulnerabilities in Sample HTTPD CGIs
G-18: Digital OSF/1 dxconsole Security Vulnerability
G-19: IBM AIX rmail Vulnerability
G-20: Vulnerability in NCSA and Apache httpd Servers
G-21: Vulnerabilities in PCNFSD Program
G-22: rpc.statd Vulnerability
G-23: Solaris NIS+ Configuration Vulnerability
G-24: FreeBSD Security Vulnerabilities
G-25: SUN statd Program Vulnerability
G-26: IRIX Desktop Permissions Panel Vulnerability
RECENT CIAC NOTES ISSUED (Previous Notes available from CIAC)
Notes 07 - 3/29/95 A comprehensive review of SATAN
Notes 08 - 4/4/95 A Courtney update
Notes 09 - 4/24/95 More on the "Good Times" virus urban legend
Notes 10 - 6/16/95 PKZ300B Trojan, Logdaemon/FreeBSD, vulnerability
in S/Key, EBOLA Virus Hoax, and Caibua Virus
Notes 11 - 7/31/95 Virus Update, Hats Off to Administrators,
America On-Line Virus Scare, SPI 3.2.2 Released,
The Die_Hard Virus
Notes 12 - 9/12/95 Securely configuring Public Telnet Services, X
Windows, beta release of Merlin, Microsoft Word
Macro Viruses, Allegations of Inappropriate Data
Collection in Win95
Notes 96-01 - 3/18/96 Java and JavaScript Vulnerabilities, FIRST
Conference Announcement, Security and Web Search
Engines, Microsoft Word Macro Virus Update
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