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Sicherheit: Umgehung der Bildschirmsperre in gdm
Aktuelle Meldungen Distributionen
Name: Umgehung der Bildschirmsperre in gdm
ID: RHSA-2017:2128-01
Distribution: Red Hat
Plattformen: Red Hat Enterprise Linux
Datum: Mi, 2. August 2017, 07:26
Referenzen: https://access.redhat.com/security/cve/CVE-2015-7496

Originalnachricht

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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: gdm and gnome-session security, bug fix, and
enhancement update
Advisory ID: RHSA-2017:2128-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:2128
Issue date: 2017-08-01
CVE Names: CVE-2015-7496
=====================================================================

1. Summary:

An update for gdm and gnome-session is now available for Red Hat Enterprise
Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le,
s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

The GNOME Display Manager (GDM) provides the graphical login screen shown
shortly after boot up, log out, and when user-switching.

The following packages have been upgraded to a later upstream version: gdm
(3.22.3), gnome-session (3.22.3). (BZ#1386862, BZ#1386957)

Security Fix(es):

* It was found that gdm could crash due to a signal handler dispatched to
an invalid conversation. An attacker could crash gdm by holding the escape
key when the screen is locked, possibly bypassing the locked screen.
(CVE-2015-7496)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.4 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

GDM must be restarted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1273156 - GDM does not work with XDMCP indirect
1283279 - CVE-2015-7496 gdm: Crash when holding Escape in log screen
1373837 - gdm not starting because of error in config
1386862 - rebase gdm to 3.22.x
1386957 - rebase gnome-session to 3.22.x
1392970 - gnome-session-failed segfaults on hard GDM service stop
1448209 - Locked screen does not show a message to insert the smartcard when
smartcard is removed
1449632 - Fuzzy translations in de, es, fr, it, ja, ko, pt_BR, ru, zh_CN, zh_TW

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
gdm-3.22.3-11.el7.src.rpm
gnome-session-3.22.3-4.el7.src.rpm

x86_64:
gdm-3.22.3-11.el7.i686.rpm
gdm-3.22.3-11.el7.x86_64.rpm
gdm-debuginfo-3.22.3-11.el7.i686.rpm
gdm-debuginfo-3.22.3-11.el7.x86_64.rpm
gnome-session-3.22.3-4.el7.x86_64.rpm
gnome-session-debuginfo-3.22.3-4.el7.x86_64.rpm
gnome-session-xsession-3.22.3-4.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
gdm-debuginfo-3.22.3-11.el7.i686.rpm
gdm-debuginfo-3.22.3-11.el7.x86_64.rpm
gdm-devel-3.22.3-11.el7.i686.rpm
gdm-devel-3.22.3-11.el7.x86_64.rpm
gnome-session-custom-session-3.22.3-4.el7.x86_64.rpm
gnome-session-debuginfo-3.22.3-4.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Source:
gdm-3.22.3-11.el7.src.rpm
gnome-session-3.22.3-4.el7.src.rpm

x86_64:
gdm-3.22.3-11.el7.i686.rpm
gdm-3.22.3-11.el7.x86_64.rpm
gdm-debuginfo-3.22.3-11.el7.i686.rpm
gdm-debuginfo-3.22.3-11.el7.x86_64.rpm
gdm-devel-3.22.3-11.el7.i686.rpm
gdm-devel-3.22.3-11.el7.x86_64.rpm
gnome-session-3.22.3-4.el7.x86_64.rpm
gnome-session-custom-session-3.22.3-4.el7.x86_64.rpm
gnome-session-debuginfo-3.22.3-4.el7.x86_64.rpm
gnome-session-xsession-3.22.3-4.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
gdm-3.22.3-11.el7.src.rpm
gnome-session-3.22.3-4.el7.src.rpm

aarch64:
gdm-3.22.3-11.el7.aarch64.rpm
gdm-debuginfo-3.22.3-11.el7.aarch64.rpm
gnome-session-3.22.3-4.el7.aarch64.rpm
gnome-session-debuginfo-3.22.3-4.el7.aarch64.rpm
gnome-session-xsession-3.22.3-4.el7.aarch64.rpm

ppc64:
gdm-3.22.3-11.el7.ppc.rpm
gdm-3.22.3-11.el7.ppc64.rpm
gdm-debuginfo-3.22.3-11.el7.ppc.rpm
gdm-debuginfo-3.22.3-11.el7.ppc64.rpm
gnome-session-3.22.3-4.el7.ppc64.rpm
gnome-session-debuginfo-3.22.3-4.el7.ppc64.rpm
gnome-session-xsession-3.22.3-4.el7.ppc64.rpm

ppc64le:
gdm-3.22.3-11.el7.ppc64le.rpm
gdm-debuginfo-3.22.3-11.el7.ppc64le.rpm
gnome-session-3.22.3-4.el7.ppc64le.rpm
gnome-session-debuginfo-3.22.3-4.el7.ppc64le.rpm
gnome-session-xsession-3.22.3-4.el7.ppc64le.rpm

s390x:
gdm-3.22.3-11.el7.s390.rpm
gdm-3.22.3-11.el7.s390x.rpm
gdm-debuginfo-3.22.3-11.el7.s390.rpm
gdm-debuginfo-3.22.3-11.el7.s390x.rpm
gnome-session-3.22.3-4.el7.s390x.rpm
gnome-session-debuginfo-3.22.3-4.el7.s390x.rpm
gnome-session-xsession-3.22.3-4.el7.s390x.rpm

x86_64:
gdm-3.22.3-11.el7.i686.rpm
gdm-3.22.3-11.el7.x86_64.rpm
gdm-debuginfo-3.22.3-11.el7.i686.rpm
gdm-debuginfo-3.22.3-11.el7.x86_64.rpm
gnome-session-3.22.3-4.el7.x86_64.rpm
gnome-session-debuginfo-3.22.3-4.el7.x86_64.rpm
gnome-session-xsession-3.22.3-4.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
gdm-debuginfo-3.22.3-11.el7.aarch64.rpm
gdm-devel-3.22.3-11.el7.aarch64.rpm
gnome-session-custom-session-3.22.3-4.el7.aarch64.rpm
gnome-session-debuginfo-3.22.3-4.el7.aarch64.rpm

ppc64:
gdm-debuginfo-3.22.3-11.el7.ppc.rpm
gdm-debuginfo-3.22.3-11.el7.ppc64.rpm
gdm-devel-3.22.3-11.el7.ppc.rpm
gdm-devel-3.22.3-11.el7.ppc64.rpm
gnome-session-custom-session-3.22.3-4.el7.ppc64.rpm
gnome-session-debuginfo-3.22.3-4.el7.ppc64.rpm

ppc64le:
gdm-debuginfo-3.22.3-11.el7.ppc64le.rpm
gdm-devel-3.22.3-11.el7.ppc64le.rpm
gnome-session-custom-session-3.22.3-4.el7.ppc64le.rpm
gnome-session-debuginfo-3.22.3-4.el7.ppc64le.rpm

s390x:
gdm-debuginfo-3.22.3-11.el7.s390.rpm
gdm-debuginfo-3.22.3-11.el7.s390x.rpm
gdm-devel-3.22.3-11.el7.s390.rpm
gdm-devel-3.22.3-11.el7.s390x.rpm
gnome-session-custom-session-3.22.3-4.el7.s390x.rpm
gnome-session-debuginfo-3.22.3-4.el7.s390x.rpm

x86_64:
gdm-debuginfo-3.22.3-11.el7.i686.rpm
gdm-debuginfo-3.22.3-11.el7.x86_64.rpm
gdm-devel-3.22.3-11.el7.i686.rpm
gdm-devel-3.22.3-11.el7.x86_64.rpm
gnome-session-custom-session-3.22.3-4.el7.x86_64.rpm
gnome-session-debuginfo-3.22.3-4.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
gdm-3.22.3-11.el7.src.rpm
gnome-session-3.22.3-4.el7.src.rpm

x86_64:
gdm-3.22.3-11.el7.i686.rpm
gdm-3.22.3-11.el7.x86_64.rpm
gdm-debuginfo-3.22.3-11.el7.i686.rpm
gdm-debuginfo-3.22.3-11.el7.x86_64.rpm
gnome-session-3.22.3-4.el7.x86_64.rpm
gnome-session-debuginfo-3.22.3-4.el7.x86_64.rpm
gnome-session-xsession-3.22.3-4.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
gdm-debuginfo-3.22.3-11.el7.i686.rpm
gdm-debuginfo-3.22.3-11.el7.x86_64.rpm
gdm-devel-3.22.3-11.el7.i686.rpm
gdm-devel-3.22.3-11.el7.x86_64.rpm
gnome-session-custom-session-3.22.3-4.el7.x86_64.rpm
gnome-session-debuginfo-3.22.3-4.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-7496
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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