Operating System:

Published:

12 March 2002

Protect yourself against future threats.

-----BEGIN PGP SIGNED MESSAGE-----

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                ESB-2002.130 -- FreeBSD-SA-02:15.cyrus-sasl
          cyrus-sasl library contains format string vulnerability
                               13 March 2002

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

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                cyrus-sasl prior to 1.5.24_8
Vendor:                 FreeBSD Ports Collection
Operating System:       FreeBSD
Platform:               i386
Impact:                 Execute Arbitrary Code/Commands
Access Required:        Remote

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----BEGIN PGP SIGNED MESSAGE-----

=============================================================================
FreeBSD-SA-02:15                                           Security Advisory
                                                                FreeBSD, Inc.

Topic:          cyrus-sasl library contains format string vulnerability

Category:       ports
Module:         cyrus-sasl
Announced:      2002-03-12
Credits:        Kari Hurtta <hurtta+zz@leija.mh.fmi.fi>
Affects:        cyrus-sasl port prior to cyrus-sasl-1.5.24_8
Corrected:      2001-12-09 03:07:36 UTC
FreeBSD only:   NO
CVE:            CAN-2001-0869

I.   Background

Cyrus-SASL is an implementation of RFC 2222 SASL (Simple
Authentication and Security Layer), a method for adding authentication
support to connection based protocols.

II.  Problem Description

Affected versions of the cyrus-sasl port contain a format string
vulnerability.  The format string vulnerability occurs during a call
to the syslog(3) function.

The cyrus-sasl port is not installed by default, nor is it "part of
FreeBSD" as such: it is part of the FreeBSD ports collection, which
contains thousands of third-party applications in a ready-to-install
format. The ports collection shipped with FreeBSD 4.4 is vulnerable
to this problem since it was discovered after its 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

Malicious remote users may cause an application using cyrus-sasl to
execute arbitrary code with the privileges of the process using the
cyrus-sasl library.  However, there are no known exploits at this
writing, and the author of cyrus-sasl does not believe that this bug
is exploitable.  See the `References' section for more information.

If the cyrus-sasl port is not installed, then your system is not
vulnerable to this problem.  The following command can be used to
determine whether or not the cyrus-sasl port is installed:

# pkg_info -I cyrus-sasl-*

IV.  Workaround

Deinstall the cyrus-sasl port if you have installed it.

V.   Solution

Do one of the following:

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

2) Deinstall the old port and install a corrected version from the
following directories.

[i386]
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/security/
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/security/

[alpha]
Packages are not automatically generated for the alpha architecture at
this time due to lack of build resources.

3) Download a new port skeleton for cyrus-sasl 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/i386/packages-4-stable/Latest/portcheckout.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/Latest/portcheckout.tgz

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in the FreeBSD ports collection.

Path                                                             Revision
- - -------------------------------------------------------------------------
ports/security/cyrus-sasl/Makefile                                   1.30
ports/security/cyrus-sasl/files/patch-lib::common.c                  1.1
- - -------------------------------------------------------------------------

VII.  References

<URL:http://www.securityfocus.com/archive/1/224148>
<URL:http://www.iss.net/security_center/static/7443.php>
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (FreeBSD)
Comment: For info see http://www.gnupg.org

iQCVAwUBPI4Ox1UuHi5z0oilAQEqfAQAm21BK3iBrye7YKOpNIe4HhWyLx5YyPs+
AEASVCg9J4n3vp//nhaOlpC9vQgdoBSX/vRDx5GCS8fkkw/l0R/KmTit1Kezahht
ms4LbcSqjxKzscPBwT3ZJZt166z5JyUXkzVOsGbEG11WMgeH/jQ4oTG/Xk9cGWH9
r+BCSjm3phw=
=VRs8
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.

-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key

iQCVAwUBPI9e9Sh9+71yA2DNAQEG1gQAhR0MvdbRyP4dPqrMqvSANXhgLt5L2eI3
xgXu67r5MspaPMweYuJ2qj52S02iyZeK96msMpZx9EWpbuv+Yz8eqvJE3ie7w34U
/NePUeLCiIYJO9oQRt9jCNbT18PSH+e5dUMJvpOzasHoSU8ngr8c+2YzfDqQgYHh
yJeFlPWwCFk=
=0m2W
-----END PGP SIGNATURE-----