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

===========================================================================
              AUSCERT External Security Bulletin Redistribution
                             
                      ESB-2000.304 -- RHSA-2000:086-05
         ypbind for Red Hat Linux 5.x, 6.x has a local root exploit
                               25 October 2000

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

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

Product:                ypbind
Vendor:                 Red Hat
Operating System:       Red Hat Linux 5.X, 6.X
Impact:                 Root Compromise
Access Required:        Local

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

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

Synopsis:          ypbind for Red Hat Linux 5.x, 6.x has a local root exploit
Advisory ID:       RHSA-2000:086-05
Issue date:        2000-10-16
Updated on:        2000-10-23
Product:           Red Hat Linux
Keywords:          ypbind string format buffer overflow syslog
Cross references:  N/A
- ---------------------------------------------------------------------

1. Topic:

ypbind as shipped in Red Hat Linux 5.x and 6.x is vulnerable to a local
root exploit.  All systems making use of NIS services are encouraged to
upgrade.

2. Relevant releases/architectures:

Red Hat Linux 5.0 - i386, alpha, sparc
Red Hat Linux 5.1 - i386, alpha, sparc
Red Hat Linux 5.2 - i386, alpha, sparc
Red Hat Linux 6.0 - i386, alpha, sparc
Red Hat Linux 6.1 - i386, alpha, sparc
Red Hat Linux 6.2 - i386, alpha, sparc
Red Hat Linux 6.2EE - i386, alpha, sparc

3. Problem description:

Systems using Network Information Service, or NIS, use a daemon called
ypbind to request information from a NIS server.  This information is then
used by the local machine. The logging code in ypbind is vulnerable to a
printf string format attack which an attacker could exploit by passing
ypbind a carefully crafted request. This attack can successfully lead to
local root access.

This problem has been corrected with these new packages.

4. Solution:

If you do not use NIS, you should remove ypbind:

rpm -e ypbind

Otherwise, for each RPM for your particular architecture, run:

rpm -Fvh [filename]

where filename is the name of the RPM.

You should then make sure that the new ypbind is running by issuing:

/etc/rc.d/init.d/ypbind restart

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

N/A

6. RPMs required:

Red Hat Linux 5.x:

alpha:
ftp://updates.redhat.com/5.2/alpha/ypbind-3.3-10.alpha.rpm

sparc:
ftp://updates.redhat.com/5.2/sparc/ypbind-3.3-10.sparc.rpm

i386:
ftp://updates.redhat.com/5.2/i386/ypbind-3.3-10.i386.rpm

sources:
ftp://updates.redhat.com/5.2/SRPMS/ypbind-3.3-10.src.rpm

Red Hat Linux 6.x:

alpha:
ftp://updates.redhat.com/6.2/alpha/ypbind-1.7-0.6.x.alpha.rpm

sparc:
ftp://updates.redhat.com/6.2/sparc/ypbind-1.7-0.6.x.sparc.rpm

i386:
ftp://updates.redhat.com/6.2/i386/ypbind-1.7-0.6.x.i386.rpm

sources:
ftp://updates.redhat.com/6.2/SRPMS/ypbind-1.7-0.6.x.src.rpm

7. Verification:

MD5 sum                           Package Name
- --------------------------------------------------------------------------
507ff0e63468e829b2c917789ba2fedd  5.2/SRPMS/ypbind-3.3-10.src.rpm
127274f9828d27f895e8d8eee8d38db6  5.2/alpha/ypbind-3.3-10.alpha.rpm
7bbf68a42a3c996c6f69b5ffaf2911f7  5.2/i386/ypbind-3.3-10.i386.rpm
3d0cd8b8700182b9b815525e1f99c82d  5.2/sparc/ypbind-3.3-10.sparc.rpm
d8caa439a1b6c7b26f843bacd01c65f8  6.2/SRPMS/ypbind-1.7-0.6.x.src.rpm
3a426e3060d31aa37b2a41d973ac3f63  6.2/alpha/ypbind-1.7-0.6.x.alpha.rpm
411017238af9a0a8891bd3078547336c  6.2/i386/ypbind-1.7-0.6.x.i386.rpm
3beff51d6a0292fd9d50fe24d07097ac  6.2/sparc/ypbind-1.7-0.6.x.sparc.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:

N/A


Copyright(c) 2000 Red Hat, Inc.

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

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

iQCVAwUBOlSNEih9+71yA2DNAQEk+AP+KeEr2kRXuvzOnuFaGnzF7cLNGn0DMgTW
jWolU4/h26QB9a1HzqGTIFbeP7gaHiFMDtVA0XAuvjAiCyVUTwTiTOTkN92DtTAM
U9cC0EjMfUNQKMSjGHd04zmkJxb61XaMeXC9/NoBaT15ZLmx6VB/ZU3csq8vJr4X
ASHjr5bFV5Y=
=+ahn
-----END PGP SIGNATURE-----