Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2000.297 -- RHSA-2000:075-05
Updated usermode packages available
19 October 2000
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: usermode
Vendor: Red Hat
Operating System: Red Hat Linux
Impact: Reduced Security
- --------------------------BEGIN INCLUDED TEXT--------------------
- ---------------------------------------------------------------------
Red Hat, Inc. Security Advisory
Synopsis: Updated usermode packages available
Advisory ID: RHSA-2000:075-05
Issue date: 2000-10-05
Updated on: 2000-10-09
Product: Red Hat Linux
Keywords: usermode format-string
Cross references: N/A
- ---------------------------------------------------------------------
1. Topic:
Updated usermode packages are now available for Red Hat Linux 6.x and 7.
2. Relevant releases/architectures:
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
Red Hat Linux 7.0 - i386
Red Hat Linux 7.0J - i386
3. Problem description:
The usermode package contains a binary (/usr/bin/userhelper), which is used
to control access to programs which are to be executed as root. Because
programs invoked by userhelper are not actually running setuid-root,
security measures built into recent versions of glibc are not active.
If one of these programs supports internationalized text messages, a
malicious user can use the LANG or LC_ALL environment variables (which are
inherited by userhelper and, in turn, any programs it runs) to create a
format-string exploit in these programs.
4. Solution:
For each RPM for your particular architecture, run:
rpm -Fvh [filename]
where filename is the name of the RPM.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
18046 - Another security hole in usermode/glibc
6. RPMs required:
Red Hat Linux 6.0 and 6.1:
alpha:
ftp://updates.redhat.com/6.2/alpha/usermode-1.36-2.6.x.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/SysVinit-2.78-5.alpha.rpm
sparc:
ftp://updates.redhat.com/6.2/sparc/usermode-1.36-2.6.x.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/SysVinit-2.78-5.sparc.rpm
i386:
ftp://updates.redhat.com/6.2/i386/usermode-1.36-2.6.x.i386.rpm
ftp://updates.redhat.com/6.2/i386/SysVinit-2.78-5.i386.rpm
sources:
ftp://updates.redhat.com/6.2/SRPMS/usermode-1.36-2.6.x.src.rpm
ftp://updates.redhat.com/6.2/SRPMS/SysVinit-2.78-5.src.rpm
Red Hat Linux 6.2:
alpha:
ftp://updates.redhat.com/6.2/alpha/usermode-1.36-2.6.x.alpha.rpm
sparc:
ftp://updates.redhat.com/6.2/sparc/usermode-1.36-2.6.x.sparc.rpm
i386:
ftp://updates.redhat.com/6.2/i386/usermode-1.36-2.6.x.i386.rpm
sources:
ftp://updates.redhat.com/6.2/SRPMS/usermode-1.36-2.6.x.src.rpm
Red Hat Linux 7.0:
i386:
ftp://updates.redhat.com/7.0/i386/usermode-1.36-3.i386.rpm
sources:
ftp://updates.redhat.com/7.0/SRPMS/usermode-1.36-3.src.rpm
7. Verification:
MD5 sum Package Name
- --------------------------------------------------------------------------
3310677ae7403c683e7947cd86b19344 6.2/SRPMS/SysVinit-2.78-5.src.rpm
c96aaae0df6782bb09bd65fb1d6dc69b 6.2/SRPMS/usermode-1.36-2.6.x.src.rpm
546bf7949c5be73b9f28b1819bfbd7c6 6.2/alpha/SysVinit-2.78-5.alpha.rpm
afb4ad3a5715c0df6596a19db4d2b3c8 6.2/alpha/usermode-1.36-2.6.x.alpha.rpm
ca5b97a1abb47b64d71ef69ab96fcb8a 6.2/i386/SysVinit-2.78-5.i386.rpm
c2bac5d41ee077d2db48ed9462802ff0 6.2/i386/usermode-1.36-2.6.x.i386.rpm
4dfeacb8db12af4b2666f2792e1027c1 6.2/sparc/SysVinit-2.78-5.sparc.rpm
8567bb088fb7cab3e298d0df24f8c626 6.2/sparc/usermode-1.36-2.6.x.sparc.rpm
5ac6cca0a146d917e0ec3f6f1e046fa8 7.0/SRPMS/usermode-1.36-3.src.rpm
5d40e125fa0a31f05b8dac9321a1fa88 7.0/i386/usermode-1.36-3.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:
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
iQCVAwUBOlSNDCh9+71yA2DNAQGJrwP6AyumZ73c7/9lbqZkJh5jQovd7qmc+lbL
MHQA6JZsYIbCsedi1xE5hp2sch8Qp42B9ylDJ3Gkz4kC7by5wVr3lrMN9aw47swh
9srlvAPAPtkOzijRvMU3aAHN5g8iDDrmw4EaZdhZy/p2qOo89q9WnzJZPfRgv5hr
i8qJMQheGp0=
=oR3Q
-----END PGP SIGNATURE-----