-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
CA-93:18 CERT Advisory
December 15, 1993
SunOS/Solbourne loadmodule and modload Vulnerability
- -----------------------------------------------------------------------------
*** This advisory supersedes CA-91.22. ***
The CERT Coordination Center has received information concerning a
vulnerability in /usr/etc/modload and $OPENWINHOME/bin/loadmodule in Sun
Microsystems, Inc. SunOS 4.1.1, 4.1.2, 4.1.3, and 4.1.3c and OpenWindows 3.0
on all sun4 and Solbourne Computer, Inc. architectures. The problem does not
exist in Solaris 2.x, Solaris x86, and sun3 architectures (OpenWindows 3.0
was not released for the sun3 architecture).
Sun has produced a patch for these vulnerabilities for sun4 architectures.
It is available through your local Sun Answer Center as well as through
anonymous FTP from the ftp.uu.net system in the /systems/sun/sun-dist
directory or from the ftp.eu.net system in the /sun/fixes directory.
Solbourne has announced a workaround that is included below.
- -----------------------------------------------------------------------------
I. Description
loadmodule(8) and modload(8) can be exploited to execute a user's
program using the effective UID of root.
II. Impact
This vulnerability allows a local user to gain root access.
III. Solution
A. SunOS Solution
Obtain and install the appropriate patches according to the
instructions included with the patches.
Module Patch ID Filename
---------- --------- ---------------
loadmodule 100448-02 100448-02.tar.Z
BSD Checksum = 19410 5
MD5 Checksum = 0215910cf65e055ed3042070bd961a22
modload 101200-02 101200-02.tar.Z
BSD Checksum = 41677 28
MD5 Checksum = 626ab2917204eb6e6eb5f165cca3e908
B. Solbourne Solution
Solbourne systems do not support the "loadmodule" functionality.
This vulnerability can be fixed on Solbourne systems by removing
the setuid bit:
chmod 0755 /usr/openwin/bin/loadmodule
The modload program does not need to replaced or changed.
- ---------------------------------------------------------------------------
The CERT Coordination Center wishes to thank Sun Microsystems, Inc.
and Solbourne Computers, Inc. for their support in responding to this
problem.
- ---------------------------------------------------------------------------
If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in Forum of Incident
Response and Security Teams (FIRST).
Internet E-mail:
[email protected]
Telephone: 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4),
and are on call for emergencies during other hours.
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Past advisories, information about FIRST representatives, and other
information related to computer security are available for anonymous
FTP from info.cert.org.
-----BEGIN PGP SIGNATURE-----
Version: 2.6.2
iQCVAwUBMiX62XVP+x0t4w7BAQEtrwQAw+hwpUyR+nszCt7MRo6gX9Yjd+eHRjBx
4HNf23p0q5fB0zdZnQTPFaMf225rwFZUE6U1bhr50UtY6ZEq+eYK/VaVFjxSqiSp
toCzuue01L227M5TN1uBeOhqWm9QOMEhRG0QFnvRBeOgJlFlbBxlV86HQfYEJ3cV
hpdTW7ZngUs=
=0z80
-----END PGP SIGNATURE-----
