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Sicherheit: Denial of Service in cloud-init
Aktuelle Meldungen Distributionen
Name: Denial of Service in cloud-init
ID: RHSA-2015:0042-01
Distribution: Red Hat
Plattformen: Red Hat Common
Datum: Mi, 14. Januar 2015, 07:29
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-2099

Originalnachricht

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Red Hat Security Advisory

Synopsis: Low: cloud-init security, bug fix, and enhancement update
Advisory ID: RHSA-2015:0042-01
Product: Red Hat Common
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0042.html
Issue date: 2015-01-13
CVE Names: CVE-2013-2099
=====================================================================

1. Summary:

Updated cloud-init packages that fix one security issue, several bugs, and
add various enhancements are now available for Red Hat Common for Red Hat
Enterprise Linux 6.

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

2. Relevant releases/architectures:

Red Hat Common for RHEL Client (v. 6) - i386, noarch, x86_64
Red Hat Common for RHEL Compute Node (v. 6) - noarch, x86_64
Red Hat Common for RHEL Server (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Common for RHEL Workstation (v. 6) - i386, noarch, x86_64

3. Description:

The cloud-init packages provide a set of init scripts for cloud instances.
Cloud instances need special scripts to run during initialization to
retrieve and install ssh keys and to let the user run various scripts.

A denial of service flaw was found in the way Python's SSL module
implementation performed matching of certain certificate names. A remote
attacker able to obtain a valid certificate that contained multiple
wildcard characters could use this flaw to issue a request to validate such
a certificate, resulting in excessive consumption of CPU. (CVE-2013-2099)

This issue was discovered by Florian Weimer of Red Hat Product Security.

The cloud-init packages have been upgraded to upstream version 0.7.5, which
provides a number of bug fixes and enhancements over the previous version.
(BZ#1111709, BZ#1119334)

All cloud-init users are advised to upgrade to these updated packages,
which correct these issues and add these enhancements.

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/articles/11258

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

963260 - CVE-2013-2099 python: ssl.match_hostname() DoS via certificates with
specially crafted hostname wildcard patterns

6. Package List:

Red Hat Common for RHEL Client (v. 6):

Source:
python-backports-1.0-3.el6.src.rpm
python-backports-ssl_match_hostname-3.4.0.2-1.el6.src.rpm
python-six-1.6.1-1.el6.src.rpm
python-urllib3-1.5-5.1.2.el6.src.rpm

i386:
python-backports-1.0-3.el6.i686.rpm

noarch:
python-backports-ssl_match_hostname-3.4.0.2-1.el6.noarch.rpm
python-six-1.6.1-1.el6.noarch.rpm
python-urllib3-1.5-5.1.2.el6.noarch.rpm

x86_64:
python-backports-1.0-3.el6.x86_64.rpm

Red Hat Common for RHEL Compute Node (v. 6):

Source:
python-backports-1.0-3.el6.src.rpm
python-backports-ssl_match_hostname-3.4.0.2-1.el6.src.rpm
python-six-1.6.1-1.el6.src.rpm
python-urllib3-1.5-5.1.2.el6.src.rpm

noarch:
python-backports-ssl_match_hostname-3.4.0.2-1.el6.noarch.rpm
python-six-1.6.1-1.el6.noarch.rpm
python-urllib3-1.5-5.1.2.el6.noarch.rpm

x86_64:
python-backports-1.0-3.el6.x86_64.rpm

Red Hat Common for RHEL Server (v. 6):

Source:
cloud-init-0.7.5-1.el6.src.rpm
python-backports-1.0-3.el6.src.rpm
python-backports-ssl_match_hostname-3.4.0.2-1.el6.src.rpm
python-boto-2.25.0-2.el6.src.rpm
python-jsonpatch-1.2-2.el6.src.rpm
python-jsonpointer-1.0-2.el6.src.rpm
python-six-1.6.1-1.el6.src.rpm
python-urllib3-1.5-5.1.2.el6.src.rpm

i386:
cloud-init-0.7.5-1.el6.i686.rpm
python-backports-1.0-3.el6.i686.rpm

noarch:
python-backports-ssl_match_hostname-3.4.0.2-1.el6.noarch.rpm
python-boto-2.25.0-2.el6.noarch.rpm
python-jsonpatch-1.2-2.el6.noarch.rpm
python-jsonpointer-1.0-2.el6.noarch.rpm
python-six-1.6.1-1.el6.noarch.rpm
python-urllib3-1.5-5.1.2.el6.noarch.rpm

ppc64:
python-backports-1.0-3.el6.ppc64.rpm

s390x:
python-backports-1.0-3.el6.s390x.rpm

x86_64:
cloud-init-0.7.5-1.el6.x86_64.rpm
python-backports-1.0-3.el6.x86_64.rpm

Red Hat Common for RHEL Workstation (v. 6):

Source:
python-backports-1.0-3.el6.src.rpm
python-backports-ssl_match_hostname-3.4.0.2-1.el6.src.rpm
python-six-1.6.1-1.el6.src.rpm
python-urllib3-1.5-5.1.2.el6.src.rpm

i386:
python-backports-1.0-3.el6.i686.rpm

noarch:
python-backports-ssl_match_hostname-3.4.0.2-1.el6.noarch.rpm
python-six-1.6.1-1.el6.noarch.rpm
python-urllib3-1.5-5.1.2.el6.noarch.rpm

x86_64:
python-backports-1.0-3.el6.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-2013-2099
https://access.redhat.com/security/updates/classification/#low

8. Contact:

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

Copyright 2015 Red Hat, Inc.
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