Operating System:

Published:

10 April 2000

Protect yourself against future threats.

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              AUSCERT External Security Bulletin Redistribution
                             
                      ESB-2000.066 -- FreeBSD-SA-00:12
                   healthd allows a local root compromise
                                11 April 2000

===========================================================================

The FreeBSD Security Team has released the following advisory concerning a
vulnerability in healthd which monitors the temperature, fan speed and
voltage levels of certain motherboards. This vulnerability may allow local
users to obtain root privileges on affected systems.

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FreeBSD-SA-00:12                                           Security Advisory
                                                                FreeBSD, Inc.

Topic:		healthd allows a local root compromise

Category:       ports
Module:         healthd
Announced:      2000-04-10
Credits:	Discovered during FreeBSD ports collection auditing.
Affects:        Ports collection before the correction date.
Corrected:      2000-03-25
Vendor status:	Updated version released.
FreeBSD only:   NO

I.   Background

healthd is a small utility for monitoring the temperature, fan speed
and voltage levels of certain motherboards.

II.  Problem Description

healthd v0.3 installs a utility which is setuid root in order to
monitor the system status. This utility contains a trivial buffer
overflow which allows an unprivileged local user to obtain root
privileges on the system.

The healthd port is not installed by default, nor is it "part of
FreeBSD" as such: it is part of the FreeBSD ports collection, which
contains over 3200 third-party applications in a ready-to-install
format. The ports collection shipped with FreeBSD 4.0 contains this
problem since it was discovered after the release.

FreeBSD makes no claim about the security of these third-party
applications, although an effort is underway to provide a security
audit of the most security-critical ports.

III. Impact

A local user can obtain root privileges by exploiting a vulnerability
in the healthd utility.

If you have not chosen to install the healthd port/package, then your
system is not vulnerable.

IV.  Workaround

Remove the healthd port, if you you have installed it.

V.   Solution

1) Upgrade your entire ports collection and rebuild the healthd port.

2) Reinstall a new package dated after the correction date, obtained from:

ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/sysutils/healthd-0.3.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/sysutils/healthd-0.3.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-3-stable/sysutils/healthd-0.3.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/sysutils/healthd-0.3.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/sysutils/healthd-0.3.tgz

3) download a new port skeleton for the healthd port from:

http://www.freebsd.org/ports/

and use it to rebuild the port.

4) Use the portcheckout utility to automate option (3) above. The
portcheckout port is available in /usr/ports/devel/portcheckout or the
package can be obtained from:

ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/devel/portcheckout-1.0.tgz


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This security bulletin is provided as a service to AusCERT's members.  As
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NOTE: This is only the original release of the security bulletin.  It may
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If you believe that your system has been compromised, contact AusCERT or
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