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Category:   Application (Generic)  >   Sudo Vendors:   Miller, Todd C.
(Red Hat Issues Fix) Re: Sudo Administration Utility May Give Local Users Root-Level Access
SecurityTracker Alert ID:  1001982
SecurityTracker URL:  http://securitytracker.com/id/1001982
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 12 2001
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to version 1.6.3p6
Description:   The Sudo super user administration utility contains a vulnerability that allows a local user to execute arbitrary shell code on the server leading to root-level access.

Sudo is an application that is, by design, installed with set userid (suid) privileges. It is intended to allow a local user to execute certain commands under the privileges of another user (such as root) while providing command logging.

The logging code reportedly contains a a buffer overflow.

Impact:   A local user could execute arbitrary shell code on the server leading to root-level access.
Solution:   Red Hat has issued a fixed package. See the Source Message for the Red Hat advisory.
Vendor URL:  www.courtesan.com/sudo/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Linux)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 19 2001 Sudo Administration Utility May Give Local Users Root-Level Access



 Source Message Contents

Subject:  [RHSA-2001:018-02] Updated sudo packages fixing buffer overrun available


---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated sudo packages fixing buffer overrun available
Advisory ID:       RHSA-2001:018-02
Issue date:        2001-02-23
Updated on:        2001-03-02
Product:           Red Hat Linux
Keywords:          sudo buffer overrun
Cross references:  
Obsoletes:         
---------------------------------------------------------------------

1. Topic:

A buffer overrun has been found in sudo.

2. Relevant releases/architectures:

Red Hat Linux 7.0 - alpha, i386

3. Problem description:

The code splitting a log entry into smaller chunks contained an
overrunnable buffer. Carefully constructed long commands could lead to
execution of code as root. There is no known exploit at this time.

4. Solution:

To update all RPMs for your particular architecture, run:

rpm -Fvh <filenames>

where <filenames> is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directly *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

29097 - buffer overflow in sudo

6. RPMs required:

Red Hat Linux 7.0:

SRPMS:
ftp://updates.redhat.com/7.0/SRPMS/sudo-1.6.3p6-1.src.rpm

alpha:
ftp://updates.redhat.com/7.0/alpha/sudo-1.6.3p6-1.alpha.rpm

i386:
ftp://updates.redhat.com/7.0/i386/sudo-1.6.3p6-1.i386.rpm



7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
7deb6eb548486c91a92d246a37925122  7.0/SRPMS/sudo-1.6.3p6-1.src.rpm
036609d1b63557cb95fe62854daa8a50  7.0/alpha/sudo-1.6.3p6-1.alpha.rpm
4121919db0d5cb503c5b3af528cbd04c  7.0/i386/sudo-1.6.3p6-1.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
    http://www.redhat.com/corp/contact.html

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:




Copyright(c) 2000, 2001 Red Hat, Inc.



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