#VU110147 Resource management error in Python - CVE-2013-2099

Vulnerability identifier: #VU110147

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-2099

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Python
Universal components / Libraries / Scripting languages

Vendor: Python.org

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Python: before

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External links
https://secunia.com/advisories/55116
https://secunia.com/advisories/55107
https://bugzilla.redhat.com/show_bug.cgi?id=963260
https://www.ubuntu.com/usn/USN-1983-1
https://www.ubuntu.com/usn/USN-1985-1
https://bugs.python.org/issue17980
https://www.openwall.com/lists/oss-security/2013/05/16/6
https://www.ubuntu.com/usn/USN-1984-1
https://rhn.redhat.com/errata/RHSA-2014-1690.html
https://access.redhat.com/errata/RHSA-2016:1166

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.