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TUCoPS :: Linux :: Red Hat/Fedora :: ciacm009.txt

CIAC M-009 Red Hat linux PAM vulnerability




             __________________________________________________________

                       The U.S. Department of Energy
                     Computer Incident Advisory Center
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

                        Red Hat Linux PAM Vulnerability

October 23, 2001 19:00 GMT                                        Number M-009
______________________________________________________________________________
PROBLEM:       A software vulnerability exists in the PAM authentication 
               process. PAM authentication may not be properly enforced in 
               non-default setups. 
PLATFORM:      Red Hat Linux 7.1:
                    Alpha
                    i386
                    ia64
               Red Hat Linux 7.2:
                    i386 
DAMAGE:        System users may receive the authentication credentials of other 
               users. 
SOLUTION:      Red Hat recommends that all users update to the latest package. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. This vulnerability has been publicly 
ASSESSMENT:    announced. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/m007.shtml 
 ORIGINAL BULLETIN:  http://www.redhat.com/support/errata/RHSA-2001-132.html 
 PATCHES:            Red Hat Linux 7.1: SRPMS: 
                     ftp://updates.redhat.com/7.1/en/os/SRPMS/util-linux-2.11f-11.7.1.src.rpm 
                     alpha: 
                     ftp://updates.redhat.com/7.1/en/os/alpha/util-linux-2.11f-11.7.1.alpha.rpm 
                     i386: 
                     ftp://updates.redhat.com/7.1/en/os/i386/util-linux-2.11f-11.7.1.i386.rpm 
                     ia64: 
                     ftp://updates.redhat.com/7.1/en/os/ia64/util-linux-2.11f-11.7.1.ia64.rpm 
                     Red Hat Linux 7.2: SRPMS: 
                     ftp://updates.redhat.com/7.2/en/os/SRPMS/util-linux-2.11f-12.src.rpm 
                     i386: 
                     ftp://updates.redhat.com/7.2/en/os/i386/util-linux-2.11f-12.i386.rpm 
______________________________________________________________________________

[******  Begin Red Hat Bulletin  ******]

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

Synopsis:          New util-linux packages available to fix /bin/login pam problem
Advisory ID:       RHSA-2001:132-04
Issue date:        2001-10-11
Updated on:        2001-10-16
Product:           Red Hat Linux
Keywords:          login pam pam_limits
Cross references:  
Obsoletes:         RHSA-2001:095-04
---------------------------------------------------------------------

1. Topic:

New util-linux packages are available that fix a problem with /bin/login's
PAM implementation. This could, in some non-default setups, cause users to
receive credentials of other users. It is recommended that all users
update to the fixed packages.

2001-10-22: Packages are now available for Red Hat Linux 7.2. Notably,
these packages also fix the problem noted in RHSA-2001:095-04 (vipw
incorrectly setting permissions on some files) - this bug was accidentally
reintroduced in Red Hat Linux 7.2.

2. Relevant releases/architectures:

Red Hat Linux 7.1 - alpha, i386, ia64

Red Hat Linux 7.2 - i386

3. Problem description:

A problem existed in /bin/login's PAM implementation; it stored the value
of a static pwent buffer across PAM calls; when used with some PAM modules
in non-default configuration (such as pam_limits), it would overwrite the
buffer, causing a user to get credentials of another user.

Thanks go to Tarhon-Onu Victor <mituc@ac.tuiasi.ro> for bringing the
problem to our attention, and to Olaf Kirch <okir@caldera.de> for providing
the patch.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

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

51646 - pam limits drops other user privileges

6. RPMs required:

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/util-linux-2.11f-11.7.1.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/util-linux-2.11f-11.7.1.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/util-linux-2.11f-11.7.1.i386.rpm

ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/util-linux-2.11f-11.7.1.ia64.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/util-linux-2.11f-12.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/util-linux-2.11f-12.i386.rpm



7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
db33b22f50978471a25fd5cc973f8f54 7.1/en/os/SRPMS/util-linux-2.11f-11.7.1.src.rpm
d55f6ec42e3c0268f2ab4decb24deb53 7.1/en/os/alpha/util-linux-2.11f-11.7.1.alpha.rpm
2bf1db1cadc50f783220f70aa2b7a09c 7.1/en/os/i386/util-linux-2.11f-11.7.1.i386.rpm
568c4ec61cb9cc0ebd6313fb14d0419c 7.1/en/os/ia64/util-linux-2.11f-11.7.1.ia64.rpm
3b5448a60fa6cb5580eb690a303827a5 7.2/en/os/SRPMS/util-linux-2.11f-12.src.rpm
c0f329c070e416fbb20c97670199d3fe 7.2/en/os/i386/util-linux-2.11f-12.i386.rpm

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




Copyright(c) 2000, 2001 Red Hat, Inc.

[******  End Red Hat Bulletin  ******]

_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Red Hat, Inc. for the 
information contained in this bulletin.
_______________________________________________________________________________


CIAC, the Computer Incident Advisory Center, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
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