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SSRT0583Q_40D_BL11 Compaq Computer Corporation Advisory TITLE: Tru64 UNIX V4.0 through V4.0e
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TITLE: SSRT0583Q_40D_BL11 Compaq Computer Corporation Advisory
Copyright (c) Compaq Computer Corporation 1999. All rights reserved.
UPDATE: APR 22, 1999
TITLE: Tru64 UNIX V4.0 through V4.0e
- Potential Security Vulnerability - ref#: SSRT0583Q
"Executable stacks allow suid applications to exploit
security hole"
SOURCE: Compaq Computer Corporation
Software Security Response Team
"Compaq is broadly distributing this Security Advisory in order
to bring to the attention of users of Compaq products the
important security information contained in this Advisory.
Compaq recommends that all users determine the applicability of
this information to their individual situations and take
appropriate action.
Compaq does not warrant that this information is necessarily
accurate or complete for all user situations and, consequently,
Compaq will not be responsible for any damages resulting from
user's use or disregard of the information provided in this
Advisory."
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IMPACT:
A potential vulnerability caused by suid application stacks being
executable could allow non-authorized users to exploit a buffer-
overrun flaw in applications such as "at" and "inc".
----------------------------------------------------------------------
RESOLUTION:
This potential security problem has been resolved and a
patch for this problem has been made available for
V4.0 through V4.0E.
*This solution will be included in the next distributed release of
Compaq's DIGITAL UNIX. Also, the patch will be in the next base
level (BL12) of the setld patch kits.
This patch may be obtained from the World Wide Web at the
following address:
http://www.support.compaq.com/patches
Use the browse access option, select DIGITAL_UNIX directory
then choose the appropriate version directory and
download the patch accordingly.
NOTE: V4.0 and V4.0A are only available by contacting your
normal Compaq Services support channel.
PATCH ID:
Compaq Digital UNIX V4.0B ssrt0583q_v40b_BL11.tar.Z
Compaq Digital UNIX V4.0C ssrt0583q_v40c_BL11.tar.Z
Compaq Digital UNIX V4.0D ssrt0583q_v40d_BL11.tar.Z
Compaq Tru64 / UNIX V4.0E ssrt0583q_v40e_BL1.tar.Z
NOTE: Prior to installing this patch you must have the following patches
installed on your system:
DIGITAL UNIX V4.0 -- Patch Kit 6 (BL9)
DIGITAL UNIX V4.0A -- Patch Kit 7 (BL10)
DIGITAL UNIX V4.0B -- Patch Kit 9 (BL11)
DIGITAL UNIX V4.0C -- Patch Kit 6 (BL11)
DIGITAL UNIX V4.0D -- Patch Kit 3 (BL11)
DIGITAL UNIX V4.0E -- Patch Kit 1 (BL1)
INSTALLATION INSTRUCTIONS:
cp /sys/BINARY/std_kern.mod /sys/BINARY/std_kern.mod_orig
cp ./std_kern.mod /sys/BINARY/std_kern.mod
chmod 0644 /sys/BINARY/std_kern.mod
chown bin:bin /sys/BINARY/std_kern.mod
cp /sys/BINARY/proc.mod /sys/BINARY/proc.mod_orig
cp ./proc.mod /sys/BINARY/proc.mod
chmod 0644 /sys/BINARY/proc.mod
chown bin:bin /sys/BINARY/proc.mod
Rebuild the kernel.
ADDITIONAL COMMENTS:
This solution will default to making the stack of all suid
programs to be not executable, hence closing the security hole.
However, please be aware that any user applications which rely
on the stack being executable will fail. For situations where
the machines are being used behind firewalls and are not in fear
of security violations, you may explicitly turn this option off.
Meaning you may allow the stack of suid programs to be executable.
Changing from default (not executable) to executable:
1. add the following two lines to /etc/sysconfigtab:
proc:
executable_stack = 1
OR
2. changing the executable_stack parameter from the
command line as follows:
# sysconfig -r proc executable_stack=1
To reiterate, if you don't change the executable_stack parameter
explicitly (as shown by the two examples above) then the stack
for all suid programs will be, not executable.
Additional Considerations:
If you believe you have, or aren't sure if you have, previously
installed a patch to any of these modules you should contact your
normal Compaq Service channel.
Also, if you need further information, please contact your normal
Compaq Services support channel.
Compaq appreciates your cooperation and patience. We regret any
inconvenience applying this information may cause.
As always, Compaq urges you to periodically review your system
management and security procedures.
Compaq will continue to review and enhance the security
features of its products and work with customers to maintain and
improve the security and integrity of their systems.
____________________________________________________________
Copyright (c) Compaq Computer Corporation, 1999 All
Rights Reserved.
Unpublished Rights Reserved Under The Copyright Laws Of
The United States.
____________________________________________________________
Files on this server are as follows:
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»ssrt0583q_40d_bl11.README
»ssrt0583q_40d_bl11.CHKSUM
»ssrt0583q_40d_bl11.tar.Z
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