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Red Hat 6: RHSA-2015:0042-01 Low: Cloud-Init DoS Risk Update

red hat
Calendar Grey January 13, 2015
Dist Redhat Esm H88
Tackling cloud-init vulnerabilities, patches, and improvements for users of Red Hat Enterprise Linux.
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

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

Summary

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.

Topics%20covered

Topics Covered

security advisory Red Hat bug fix low severity cloud-init DoS impact

References

https://access.redhat.com/security/cve/CVE-2013-2099 https://access.redhat.com/security/updates/classification/#low

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:

Read the Full Advisory


Severity
low
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2015:0042-01
Product: Red Hat Common
Advisory URL: https://access.redhat.com/errata/RHSA-2015:0042.html
Issue date: 2015-01-13

Topic

Updated cloud-init packages that fix one security issue, several bugs, andadd various enhancements are now available for Red Hat Common for Red HatEnterprise Linux 6.Red Hat Product Security has rated this update as having Low securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory Red Hat bug fix low severity cloud-init DoS impact

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

Bugs Fixed

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

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