Scientific Linux Security Update : GNOME Shell on SL7.x x86_64

This script is Copyright (C) 2015 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

It was found that the GNOME shell did not disable the Print Screen key
when the screen was locked. This could allow an attacker with physical
access to a system with a locked screen to crash the screen-locking
application by creating a large amount of screenshots. (CVE-2014-7300)

This update also fixes the following bugs :

- The Timed Login feature, which automatically logs in a
specified user after a specified period of time, stopped
working after the first user of the GUI logged out. This
has been fixed, and the specified user is always logged
in if no one else logs in.

- If two monitors were arranged vertically with the
secondary monitor above the primary monitor, it was
impossible to move windows onto the secondary monitor.
With this update, windows can be moved through the upper
edge of the first monitor to the secondary monitor.

- If the Gnome Display Manager (GDM) user list was
disabled and a user entered the user name, the password
prompt did not appear. Instead, the user had to enter
the user name one more time. The GDM code that contained
this error has been fixed, and users can enter their
user names and passwords as expected.

- Prior to this update, only a small area was available on
the GDM login screen for a custom text banner. As a
consequence, when a long banner was used, it did not fit
into the area, and the person reading the banner had to
use scrollbars to view the whole text. With this update,
more space is used for the banner if necessary, which
allows the user to read the message conveniently.

- When the Cancel button was pressed while an LDAP user
name and password was being validated, the GDM code did
not handle the situation correctly. As a consequence,
GDM became unresponsive, and it was impossible to return
to the login screen. The affected code has been fixed,
and LDAP user validation can be canceled, allowing
another user to log in instead.

- If the window focus mode in GNOME was set to 'mouse' or
'sloppy', navigating through areas of a pop-up menu
displayed outside its parent window caused the window to
lose its focus. Consequently, the menu was not usable.
This has been fixed, and the window focus is kept in
under this scenario.

- If user authentication is configured to require a smart
card to log in, user names are obtained from the smart
card. The authentication is then performed by entering
the smart card PIN. Prior to this update, the login
screen allowed a user name to be entered if no smart
card was inserted, but due to a bug in the underlying
code, the screen became unresponsive. If, on the other
hand, a smart card was used for authentication, the user
was logged in as soon as the authentication was
complete. As a consequence, it was impossible to select
a session other than GNOME Classic. Both of these
problems have been fixed. Now, a smart card is required
when this type of authentication is enabled, and any
other installed session can be selected by the user.

In addition, this update adds the following enhancement :

- Support for quad-buffer OpenGL stereo visuals has been
added. As a result, OpenGL applications that use
quad-buffer stereo can be run and properly displayed
within the GNOME desktop when used with a video driver
and hardware with the necessary capabilities.

See also :

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 82249 ()

Bugtraq ID:

CVE ID: CVE-2014-7300

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