RedHat: Updated PAM packages are available
Posted by LinuxSecurity.com Team   
RedHat Linux Workstations running a display manager may potentially allow remote users to access console devices.
---------------------------------------------------------------------
                   Red Hat, Inc. Security Advisory

Synopsis:          Updated PAM packages are available.
Advisory ID:       RHSA-2000:044-02
Issue date:        2000-07-21
Updated on:        2000-07-21
Product:           Red Hat Linux
Keywords:          N/A
Cross references:  N/A
---------------------------------------------------------------------

1. Topic:

Updated pam packages are available for Red Hat Linux 6.x.
These packages fix a bug that would potentially allow
remote users to access console devices and shut down the
workstation if the workstation is running a display manager
(xdm, gdm, kdm, etc.) with XDMCP enabled.

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

3. Problem description:

If a workstation is configured to use a display manager (xdm,
gdm, kdm, etc.) AND has XDMCP enabled, it is possible for a user
who logs in remotely to use Xnest -query to log in on display
:1, which is recognized as the system console.

This is the documented behavior for Red Hat Linux 6.0, 6.1, and
6.2.  This update disables this feature by default.  Users of Red
Hat Linux 5.x are not affected because the pam_console.so module
was not included in releases prior to 6.0.

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):

11165 - Gnome panel, ssh can allow remote non-root users to halt,reboot
12417 - man pages not installed properly in pam
12430 - /sbin/{pwdb,unix}_chkpwd not stripped


6. RPMs required:

Red Hat Linux 6.2:

sparc: 
ftp://updates.Red Hat.com/6.2/sparc/pam-0.72-20.sparc.rpm

alpha: 
ftp://updates.Red Hat.com/6.2/alpha/pam-0.72-20.alpha.rpm

i386: 
ftp://updates.Red Hat.com/6.2/i386/pam-0.72-20.i386.rpm

sources: 
ftp://updates.Red Hat.com/6.2/SRPMS/pam-0.72-20.src.rpm

7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
1e0f9bd6ac389b40c90daba918c419eb  6.2/SRPMS/pam-0.72-20.src.rpm
8834754c1b0fd31ac4fa8f3e54bb7444  6.2/alpha/pam-0.72-20.alpha.rpm
b0376fbeb5fa31b1ac118b1831185959  6.2/i386/pam-0.72-20.i386.rpm
be592c19f8742f9dca85d6ef19cbfb80  6.2/sparc/pam-0.72-20.sparc.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.