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CVE-2013-2099

Impact:
Low
Public Date:
2013-05-15
CWE:
CWE-407
Bugzilla:
963260: CVE-2013-2099 python: ssl.match_hostname() DoS via certificates with specially crafted hostname wildcard patterns
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.

Find out more about CVE-2013-2099 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

Not vulnerable. This issue did not affect the versions of python as shipped with Red Hat Enterprise Linux 5 and 6 as the SSL module there did not implement the match_hostname() routine yet.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 2.6
Base Metrics AV:N/AC:H/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity High
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Storage Native Client for Red Hat Enterprise Linux 5 (glusterfs) RHSA-2014:1263 2014-09-18
Red Hat Storage Console 2.1 (rhsc-branding-rhs) RHSA-2014:1263 2014-09-18
Red Hat Storage Server 2.1 (python-backports-ssl_match_hostname) RHSA-2014:1263 2014-09-18
Red Hat Storage Native Client for Red Hat Enterprise Linux 6 (glusterfs) RHSA-2014:1263 2014-09-18
Red Hat Enterprise Linux OpenStack Platform 4.0 (python-backports-ssl_match_hostname) RHSA-2014:1690 2014-10-22
Red Hat Common for Red Hat Enterprise Linux 6 (python-backports-ssl_match_hostname) RHSA-2015:0042 2015-01-13

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 6 python Not affected
Red Hat Enterprise Linux 7 python Not affected
Red Hat Enterprise Linux 6 bzr Not affected
Red Hat Enterprise Linux 7 python-tornado Not affected
Red Hat Enterprise Linux 7 bzr Fix deferred
Red Hat Enterprise Linux 5 python Not affected

Acknowledgements

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