CVE-2013-2099

Description

Algorithmic complexity vulnerability in the ssl.match_hostname function in Python 3.2.x, 3.3.x, and earlier, and unspecified versions of python-backports-ssl_match_hostname as used for older Python versions, allows remote attackers to cause a denial of service (CPU consumption) via multiple wildcard characters in the common name in a certificate.

Category

4.3
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 1.42% Top 25%
Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory secunia.com Vendor Advisory secunia.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=963260
http://www.ubuntu.com/usn/USN-1984-1 vendor advisory
http://secunia.com/advisories/55116 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2016:1166 vendor advisory
http://www.ubuntu.com/usn/USN-1985-1 vendor advisory
http://bugs.python.org/issue17980 patch
http://secunia.com/advisories/55107 third party advisory vendor advisory
http://rhn.redhat.com/errata/RHSA-2014-1690.html vendor advisory
http://www.ubuntu.com/usn/USN-1983-1 vendor advisory
http://www.openwall.com/lists/oss-security/2013/05/16/6 mailing list

Frequently Asked Questions

What is the severity of CVE-2013-2099?
CVE-2013-2099 has been scored as a medium severity vulnerability.
How to fix CVE-2013-2099?
To fix CVE-2013-2099, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2013-2099 being actively exploited in the wild?
It is possible that CVE-2013-2099 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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