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RedHat: 'usermode' format-string vulnerability Print E-mail
User Rating:      How can I rate this item?
Posted by LinuxSecurity.com Team   
RedHat Linux A malicious user can use the LANG or LC_ALL environment variable to create a format-string exploit.

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

Synopsis:          Updated usermode packages available
Advisory ID:       RHSA-2000:075-07
Issue date:        2000-10-05
Updated on:        2000-11-08
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.

These updated packages also fix a problem due to an incorrect path
specification in the /usr/bin/shutdown wrapper script and close a potential
security vulnerability in the userhelper binary.

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.Red Hat.com/bugzilla for more info):

18046 - Another security hole in usermode/glibc
19034 - shutdown wrapper references non-existent /usr/sbin/shutdown
20160 - shutdown script contains call to /usr/sbin/shutdown, which doesn't exist
20027 - /usr/sbin/userhelper dies in segmentation fault


6. RPMs required:

Red Hat Linux 6.0:

sparc: 
ftp://updates.Red Hat.com/6.0/sparc/usermode-1.37-1.6.sparc.rpm 
ftp://updates.Red Hat.com/6.0/sparc/SysVinit-2.78-5.sparc.rpm

i386: 
ftp://updates.Red Hat.com/6.0/i386/usermode-1.37-1.6.i386.rpm 
ftp://updates.Red Hat.com/6.0/i386/SysVinit-2.78-5.i386.rpm

alpha: 
ftp://updates.Red Hat.com/6.0/alpha/usermode-1.37-1.6.alpha.rpm 
ftp://updates.Red Hat.com/6.0/alpha/SysVinit-2.78-5.alpha.rpm

sources: 
ftp://updates.Red Hat.com/6.0/SRPMS/usermode-1.37-1.6.src.rpm 
ftp://updates.Red Hat.com/6.0/SRPMS/SysVinit-2.78-5.src.rpm

Red Hat Linux 6.1:

alpha: 
ftp://updates.Red Hat.com/6.1/alpha/usermode-1.37-1.6.alpha.rpm 
ftp://updates.Red Hat.com/6.1/alpha/SysVinit-2.78-5.alpha.rpm

sparc: 
ftp://updates.Red Hat.com/6.1/sparc/usermode-1.37-1.6.sparc.rpm 
ftp://updates.Red Hat.com/6.1/sparc/SysVinit-2.78-5.sparc.rpm

i386: 
ftp://updates.Red Hat.com/6.1/i386/usermode-1.37-1.6.i386.rpm 
ftp://updates.Red Hat.com/6.1/i386/SysVinit-2.78-5.i386.rpm

sources: 
ftp://updates.Red Hat.com/6.1/SRPMS/usermode-1.37-1.6.src.rpm 
ftp://updates.Red Hat.com/6.1/SRPMS/SysVinit-2.78-5.src.rpm

Red Hat Linux 6.2:

alpha: 
ftp://updates.Red Hat.com/6.2/alpha/usermode-1.37-1.6.alpha.rpm 
ftp://updates.Red Hat.com/6.2/alpha/SysVinit-2.78-5.alpha.rpm

sparc: 
ftp://updates.Red Hat.com/6.2/sparc/usermode-1.37-1.6.sparc.rpm 
ftp://updates.Red Hat.com/6.2/sparc/SysVinit-2.78-5.sparc.rpm

i386: 
ftp://updates.Red Hat.com/6.2/i386/usermode-1.37-1.6.i386.rpm 
ftp://updates.Red Hat.com/6.2/i386/SysVinit-2.78-5.i386.rpm

sources: 
ftp://updates.Red Hat.com/6.2/SRPMS/usermode-1.37-1.6.src.rpm 
ftp://updates.Red Hat.com/6.2/SRPMS/SysVinit-2.78-5.src.rpm

Red Hat Linux 7.0:

i386: 
ftp://updates.Red Hat.com/7.0/i386/usermode-1.37-2.i386.rpm

sources: 
ftp://updates.Red Hat.com/7.0/SRPMS/usermode-1.37-2.src.rpm

7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
3310677ae7403c683e7947cd86b19344  6.0/SRPMS/SysVinit-2.78-5.src.rpm
e299c4b17b7eafdf66acf1fb21491d9b  6.0/SRPMS/usermode-1.37-1.6.src.rpm
546bf7949c5be73b9f28b1819bfbd7c6  6.0/alpha/SysVinit-2.78-5.alpha.rpm
978af994a09fcbc4bf1cb2fa2723bfe7  6.0/alpha/usermode-1.37-1.6.alpha.rpm
ca5b97a1abb47b64d71ef69ab96fcb8a  6.0/i386/SysVinit-2.78-5.i386.rpm
e8fe2db6f95348a93a373673b1c87443  6.0/i386/usermode-1.37-1.6.i386.rpm
4dfeacb8db12af4b2666f2792e1027c1  6.0/sparc/SysVinit-2.78-5.sparc.rpm
ba94a59a3a8195346735f202f28af3f8  6.0/sparc/usermode-1.37-1.6.sparc.rpm
3310677ae7403c683e7947cd86b19344  6.1/SRPMS/SysVinit-2.78-5.src.rpm
e299c4b17b7eafdf66acf1fb21491d9b  6.1/SRPMS/usermode-1.37-1.6.src.rpm
546bf7949c5be73b9f28b1819bfbd7c6  6.1/alpha/SysVinit-2.78-5.alpha.rpm
978af994a09fcbc4bf1cb2fa2723bfe7  6.1/alpha/usermode-1.37-1.6.alpha.rpm
ca5b97a1abb47b64d71ef69ab96fcb8a  6.1/i386/SysVinit-2.78-5.i386.rpm
e8fe2db6f95348a93a373673b1c87443  6.1/i386/usermode-1.37-1.6.i386.rpm
4dfeacb8db12af4b2666f2792e1027c1  6.1/sparc/SysVinit-2.78-5.sparc.rpm
ba94a59a3a8195346735f202f28af3f8  6.1/sparc/usermode-1.37-1.6.sparc.rpm
3310677ae7403c683e7947cd86b19344  6.2/SRPMS/SysVinit-2.78-5.src.rpm
e299c4b17b7eafdf66acf1fb21491d9b  6.2/SRPMS/usermode-1.37-1.6.src.rpm
546bf7949c5be73b9f28b1819bfbd7c6  6.2/alpha/SysVinit-2.78-5.alpha.rpm
978af994a09fcbc4bf1cb2fa2723bfe7  6.2/alpha/usermode-1.37-1.6.alpha.rpm
ca5b97a1abb47b64d71ef69ab96fcb8a  6.2/i386/SysVinit-2.78-5.i386.rpm
e8fe2db6f95348a93a373673b1c87443  6.2/i386/usermode-1.37-1.6.i386.rpm
4dfeacb8db12af4b2666f2792e1027c1  6.2/sparc/SysVinit-2.78-5.sparc.rpm
ba94a59a3a8195346735f202f28af3f8  6.2/sparc/usermode-1.37-1.6.sparc.rpm
ede9b759a01552a261c67ebf0238794a  7.0/SRPMS/usermode-1.37-2.src.rpm
c32888b6f362b04f8a3805d4465c042a  7.0/i386/usermode-1.37-2.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
     http://www.Red Hat.com/corp/contact.html

You can verify each package with the following command:
    rpm --checksig  

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 

8. References:

N/A


Copyright(c) 2000 Red Hat, Inc.

 
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