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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgendes RedHat Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.
CVE-2011-3368 – Schwachstelle im Apache Modul mod_proxy
In dem Apache Modul mod_proxy ist in Verbindung mit RewriteRule und
ProxyPassMatch eine Schwachstelle bei Pattern Matches fuer die
Konfiguration eines Reverse Proxy vorhanden. Ein entfernter Angreifer
kann diese Schwachstelle mit einer entsprechenden URL ausnutzen, um eine
Anfrage an Intranet Webserver zu senden.
CVE-2011-3192 – Denial of Service-Schwachstelle in Apache
Im Apache HTTP Server Version 1.3.x bzw. 2.0.x bis 2.0.64 und 2.2.x bis
Version 2.2.19 besteht ein Fehler bei der Verarbeitung des HTTP-Header
Feldes “Range”, mit dem Teile eines Dokumentes vom Webserver angefordert
werden koennen. Ein entfernter Angreifer kann dies ausnutzen, um durch
Senden verschiedener Werte fuer das Range-Feld, die sich ueberschneiden
und in einer unsortierten Reihenfolge abgeschickt werden, eine sehr hohe
Speicher- und CPU-Auslastung erzeugen, welche den Webserver zum Absturz
oder zum Stillstand bringen kann.
CVE-2011-3348 – Denial of Service-Schwachstelle im Apache Modul
mod_proxy_ajp
Im Apache HTTP Server vor Version 2.2.21 behandelt das Modul
mod_proxy_ajp bestimmte HTTP Anfragen nicht richtig. Bei Empfang
entsprechend aufbereiteter Requests kann dieses den Backend Server bis
zu einem ‘retry timeout’ in einen Fehlerstatus versetzen, so dass er
voruebergehend keine weiteren Anfragen beantwortet. Ein entfernter
Angreifer kann diese Schwachstelle ausnutzen, um mit dem Absetzen
manipulierter Anfragen einen Denial of Service auszuloesen.
Betroffen sind die folgenden Software Pakete und Plattformen:
Paket httpd
Red Hat Enterprise Linux Desktop (v. 6) – i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) – i386, noarch,
x86_64
Red Hat Enterprise Linux HPC Node (v. 6) – x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) – noarch, x86_64
Red Hat Enterprise Linux Server (v. 6) – i386, noarch, ppc64, s390x,
x86_64
Red Hat Enterprise Linux Workstation (v. 6) – i386, noarch, 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: httpd security and bug fix update
Advisory ID: RHSA-2011:1391-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-1391.html
Issue date: 2011-10-20
CVE Names: CVE-2011-3348 CVE-2011-3368
=====================================================================
1. Summary:
Updated httpd packages that fix two security issues and one bug 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:
Red Hat Enterprise Linux Desktop (v. 6) – i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) – i386, noarch, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) – x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) – noarch, x86_64
Red Hat Enterprise Linux Server (v. 6) – i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) – i386, noarch, x86_64
3. Description:
The Apache HTTP Server is a popular web server.
It was discovered that the Apache HTTP Server did not properly validate the
request URI for proxied requests. In certain configurations, if a reverse
proxy used the ProxyPassMatch directive, or if it used the RewriteRule
directive with the proxy flag, a remote attacker could make the proxy
connect to an arbitrary server, possibly disclosing sensitive information
from internal web servers not directly accessible to the attacker.
(CVE-2011-3368)
It was discovered that mod_proxy_ajp incorrectly returned an “Internal
Server Error” response when processing certain malformed HTTP requests,
which caused the back-end server to be marked as failed in configurations
where mod_proxy was used in load balancer mode. A remote attacker could
cause mod_proxy to not send requests to back-end AJP (Apache JServ
Protocol) servers for the retry timeout period or until all back-end
servers were marked as failed. (CVE-2011-3348)
Red Hat would like to thank Context Information Security for reporting the
CVE-2011-3368 issue.
This update also fixes the following bug:
* The fix for CVE-2011-3192 provided by the RHSA-2011:1245 update
introduced regressions in the way httpd handled certain Range HTTP header
values. This update corrects those regressions. (BZ#736592)
All httpd users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the updated
packages, the httpd daemon must be restarted for the update to take effect.
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
https://access.redhat.com/kb/docs/DOC-11259
5. Bugs fixed (http://bugzilla.redhat.com/):
736592 – httpd: RHSA-2011:1245 regressions [rhel-6]
736690 – CVE-2011-3348 httpd: mod_proxy_ajp remote temporary DoS
740045 – CVE-2011-3368 httpd: reverse web proxy vulnerability
6. Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm
i386:
httpd-2.2.15-9.el6_1.3.i686.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-tools-2.2.15-9.el6_1.3.i686.rpm
x86_64:
httpd-2.2.15-9.el6_1.3.x86_64.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm
httpd-tools-2.2.15-9.el6_1.3.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm
i386:
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-devel-2.2.15-9.el6_1.3.i686.rpm
mod_ssl-2.2.15-9.el6_1.3.i686.rpm
noarch:
httpd-manual-2.2.15-9.el6_1.3.noarch.rpm
x86_64:
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm
httpd-devel-2.2.15-9.el6_1.3.i686.rpm
httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm
mod_ssl-2.2.15-9.el6_1.3.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm
x86_64:
httpd-2.2.15-9.el6_1.3.x86_64.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm
httpd-tools-2.2.15-9.el6_1.3.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/httpd-2.2.15-9.el6_1.3.src.rpm
noarch:
httpd-manual-2.2.15-9.el6_1.3.noarch.rpm
x86_64:
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm
httpd-devel-2.2.15-9.el6_1.3.i686.rpm
httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm
mod_ssl-2.2.15-9.el6_1.3.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm
i386:
httpd-2.2.15-9.el6_1.3.i686.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-devel-2.2.15-9.el6_1.3.i686.rpm
httpd-tools-2.2.15-9.el6_1.3.i686.rpm
mod_ssl-2.2.15-9.el6_1.3.i686.rpm
noarch:
httpd-manual-2.2.15-9.el6_1.3.noarch.rpm
ppc64:
httpd-2.2.15-9.el6_1.3.ppc64.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.ppc.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.ppc64.rpm
httpd-devel-2.2.15-9.el6_1.3.ppc.rpm
httpd-devel-2.2.15-9.el6_1.3.ppc64.rpm
httpd-tools-2.2.15-9.el6_1.3.ppc64.rpm
mod_ssl-2.2.15-9.el6_1.3.ppc64.rpm
s390x:
httpd-2.2.15-9.el6_1.3.s390x.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.s390.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.s390x.rpm
httpd-devel-2.2.15-9.el6_1.3.s390.rpm
httpd-devel-2.2.15-9.el6_1.3.s390x.rpm
httpd-tools-2.2.15-9.el6_1.3.s390x.rpm
mod_ssl-2.2.15-9.el6_1.3.s390x.rpm
x86_64:
httpd-2.2.15-9.el6_1.3.x86_64.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm
httpd-devel-2.2.15-9.el6_1.3.i686.rpm
httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm
httpd-tools-2.2.15-9.el6_1.3.x86_64.rpm
mod_ssl-2.2.15-9.el6_1.3.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/httpd-2.2.15-9.el6_1.3.src.rpm
i386:
httpd-2.2.15-9.el6_1.3.i686.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-devel-2.2.15-9.el6_1.3.i686.rpm
httpd-tools-2.2.15-9.el6_1.3.i686.rpm
mod_ssl-2.2.15-9.el6_1.3.i686.rpm
noarch:
httpd-manual-2.2.15-9.el6_1.3.noarch.rpm
x86_64:
httpd-2.2.15-9.el6_1.3.x86_64.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.i686.rpm
httpd-debuginfo-2.2.15-9.el6_1.3.x86_64.rpm
httpd-devel-2.2.15-9.el6_1.3.i686.rpm
httpd-devel-2.2.15-9.el6_1.3.x86_64.rpm
httpd-tools-2.2.15-9.el6_1.3.x86_64.rpm
mod_ssl-2.2.15-9.el6_1.3.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/#package
7. References:
https://www.redhat.com/security/data/cve/CVE-2011-3348.html
https://www.redhat.com/security/data/cve/CVE-2011-3368.html
https://access.redhat.com/security/updates/classification/#moderate
https://rhn.redhat.com/errata/RHSA-2011-1245.html
8. Contact:
The Red Hat security contact is
details at https://access.redhat.com/security/team/contact/
Copyright 2011 Red Hat, Inc.
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