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New util-linux packages are available for Red Hat Linux 7.1. These packages
fix a problem where vipw would leave the /etc/shadow file world-readable
after editing it.
It is recommended that all users update to the fixed packages. Also, if you
have used vipw on Red Hat Linux 7.1 before, make sure to run (as root):
chmod 0400 /etc/shadow
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---------------------------------------------------------------------
Red Hat, Inc. Red Hat Security Advisory
Synopsis: New util-linux packages available to fix vipw permissions problems
Advisory ID: RHSA-2001:095-04
Issue date: 2001-07-12
Updated on: 2001-07-16
Product: Red Hat Linux
Keywords: util-linux vipw /etc/shadow permissions
Cross references:
Obsoletes:
---------------------------------------------------------------------
1. Topic:
New util-linux packages are available for Red Hat Linux 7.1. These packages
fix a problem where vipw would leave the /etc/shadow file world-readable
after editing it.
It is recommended that all users update to the fixed packages. Also, if you
have used vipw on Red Hat Linux 7.1 before, make sure to run (as root):
chmod 0400 /etc/shadow
2. Relevant releases/architectures:
Red Hat Linux 7.1 - alpha, i386, ia64
3. Problem description:
vipw, from the util-linux package in Red Hat Linux 7.1, included a new
option that allowed editing of the /etc/shadow file as well as /etc/passwd.
However, this option did not take measures to ensure that the file remained
only readable by root.
Thanks go to [e-mail:lloyd@acm.jhu.edu] for bringing the problem to our attention.
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.
Also note that users of vipw may want to run (as root):
chmod 0400 /etc/shadow
to ensure that the file has the correct permissions.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
48786 - Serious security problem in vipw, util-linux 2.10s
6. RPMs required:
Red Hat Linux 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/util-linux-2.10s-13.7.src.rpm
alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/util-linux-2.10s-13.7.alpha.rpm
i386:
ftp://updates.redhat.com/7.1/en/os/i386/util-linux-2.10s-13.7.i386.rpm
ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/util-linux-2.10s-13.7.ia64.rpm
7. Verification:
MD5 sum Package Name
--------------------------------------------------------------------------
96997395f6773109c6fe12f015145a4e 7.1/en/os/SRPMS/util-linux-2.10s-13.7.src.rpm
148ed6ee554cec8552a9795192deaa51 7.1/en/os/alpha/util-linux-2.10s-13.7.alpha.rpm
06f71eb2fd286d18ea45430ffe790b63 7.1/en/os/i386/util-linux-2.10s-13.7.i386.rpm
dceed158e6eb988b972f924a01fdc265 7.1/en/os/ia64/util-linux-2.10s-13.7.ia64.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
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:
Copyright(c) 2000, 2001 Red Hat, Inc.
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