[RedHat] Mehrere Schwachstellen in pam

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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgendes RedHat Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.

CVE-2010-3435 – Schwachstelle im Modul pam_mail

Das Modul pam_mail verfuegt bei Zugriff auf Benutzerdateien ueber die
Privilegien von root. In bestimmten Konfigurationen kann ein lokaler
Angreifer diese Schwachstelle ausnutzen, um Informationen ueber Dateien
und Verzeichnisse zu erlangen, auf die er keinen Zugriff hat.

CVE-2010-3853 – Schwachstelle im Modul pam_namespace

Das Modul pam_namespace fuehrt das externe Skript namespace.init im
Rechtekontext der Anwendung aus, von der PAM aufgerufen wurde. Ein
lokaler Angreifer kann in bestimmten Faellen diese Schwachstelle zur
Privilegienerweiterung ausnutzen.

CVE-2010-3316 – Schwachstelle im Modul pam_xauth

Das Modul pam_xauth ueberprueft die Rueckgabewerte der Systemcalls
setuid() und setgid() nicht. Ein lokaler Angreifer kann diese
Schwachstelle ausnutzen, um den Befehl xauth mit den Rechten von root zu
starten und eine beliebige Eingabedatei auszulesen.

Betroffen sind die folgenden Software Pakete und Plattformen:

Paket pam

Red Hat Enterprise Linux Desktop (v. 6) – i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) – i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) – x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) – x86_64
Red Hat Enterprise Linux Server (v. 6) – i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) – i386, x86_64

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
Detlev O. Matthies

– —

Detlev O. Matthies, M.Sc. (Incident Response Team)

DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-590
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski

Automatische Warnmeldungen https://www.cert.dfn.de/autowarn

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

Synopsis: Moderate: pam security update
Advisory ID: RHSA-2010:0891-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2010-0891.html
Issue date: 2010-11-16
CVE Names: CVE-2010-3316 CVE-2010-3435 CVE-2010-3853
=====================================================================

1. Summary:

Updated pam packages that fix three security issues are now available for
Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

2. Relevant releases/architectures:

3. Description:

Pluggable Authentication Modules (PAM) provide a system whereby
administrators can set up authentication policies without having to
recompile programs that handle authentication.

It was discovered that the pam_namespace module executed the external
script namespace.init with an unchanged environment inherited from an
application calling PAM. In cases where such an environment was untrusted
(for example, when pam_namespace was configured for setuid applications
such as su or sudo), a local, unprivileged user could possibly use this
flaw to escalate their privileges. (CVE-2010-3853)

It was discovered that the pam_env and pam_mail modules used root
privileges while accessing user’s files. A local, unprivileged user could
use this flaw to obtain information, from the lines that have the KEY=VALUE
format expected by pam_env, from an arbitrary file. Also, in certain
configurations, a local, unprivileged user using a service for which the
pam_mail module was configured for, could use this flaw to obtain limited
information about files or directories that they do not have access to.
(CVE-2010-3435)

Note: As part of the fix for CVE-2010-3435, this update changes the default
value of pam_env’s configuration option user_readenv to 0, causing the
module to not read user’s ~/.pam_environment configuration file by default,
as reading it may introduce unexpected changes to the environment of the
service using PAM, or PAM modules consulted after pam_env.

It was discovered that the pam_xauth module did not verify the return
values of the setuid() and setgid() system calls. A local, unprivileged
user could use this flaw to execute the xauth command with root privileges
and make it read an arbitrary input file. (CVE-2010-3316)

Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for
reporting the CVE-2010-3435 issue.

All pam users should upgrade to these updated packages, which contain
backported patches to correct these issues.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

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

637898 – CVE-2010-3316 pam: pam_xauth missing return value checks from setuid() and similar calls
641335 – CVE-2010-3435 pam: pam_env and pam_mail accessing users’ file with root privileges
643043 – CVE-2010-3853 pam: pam_namespace executes namespace.init with service’s environment

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm

i386:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm

x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm

i386:
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm

x86_64:
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm

x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm

x86_64:
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm

i386:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm

ppc64:
pam-1.1.1-4.el6_0.1.ppc.rpm
pam-1.1.1-4.el6_0.1.ppc64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.ppc.rpm
pam-debuginfo-1.1.1-4.el6_0.1.ppc64.rpm
pam-devel-1.1.1-4.el6_0.1.ppc.rpm
pam-devel-1.1.1-4.el6_0.1.ppc64.rpm

s390x:
pam-1.1.1-4.el6_0.1.s390.rpm
pam-1.1.1-4.el6_0.1.s390x.rpm
pam-debuginfo-1.1.1-4.el6_0.1.s390.rpm
pam-debuginfo-1.1.1-4.el6_0.1.s390x.rpm
pam-devel-1.1.1-4.el6_0.1.s390.rpm
pam-devel-1.1.1-4.el6_0.1.s390x.rpm

x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm

i386:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.i686.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://www.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2010-3316.html
https://www.redhat.com/security/data/cve/CVE-2010-3435.html
https://www.redhat.com/security/data/cve/CVE-2010-3853.html
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is . More contact
details at https://www.redhat.com/security/team/contact/

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[RedHat] Mehrere Schwachstellen in pam - RHSA-2010:0891-01

LMP003 Chemnitzer Linux-Tage 2026

[RedHat] Mehrere Schwachstellen in pam – RHSA-2010:0891-01

[RedHat] Mehrere Schwachstellen in pam - RHSA-2010:0891-01