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                   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
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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 (https://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:
    https://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.