RHSA-2014:1690 - Security Advisory

Topic

An updated python-backports-ssl_match_hostname package that fixes one
security issue is now available for Red Hat Enterprise Linux OpenStack
Platform 4.0.

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.

Description

The python-backports-ssl_match_hostname package provides RFC 6125 compliant
wildcard matching.

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.

All python-backports-ssl_match_hostname users are advised to upgrade to
this updated package, which contains a backported patch to correct this
issue.

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

Affected Products

• Red Hat OpenStack 4.0 x86_64

Fixes

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

CVEs

• CVE-2013-2099

References

• https://access.redhat.com/security/updates/classification/#low