Date: Fri, 21 Jul 2000 16:56:00 -0400
From: bugzilla@REDHAT.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: [RHSA-2000:044-02] Updated PAM packages are available.
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.redhat.com/bugzilla
for more info):
1165 – 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.redhat.com/6.2/sparc/pam-0.72-20.sparc.rpm
alpha:
ftp://updates.redhat.com/6.2/alpha/pam-0.72-20.alpha.rpm
i386:
ftp://updates.redhat.com/6.2/i386/pam-0.72-20.i386.rpm
sources:
ftp://updates.redhat.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.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