Resource management error in Python - CVE-2013-2099
Published: February 13, 2023 / Updated: June 3, 2025
Vulnerability identifier: #VU110147
CSH Severity: Medium
CVSSv4.0: 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: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Python
Python
Software vendor:
Python.org
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.
Remediation
Install update from vendor's website.
External links
- http://secunia.com/advisories/55116
- http://secunia.com/advisories/55107
- https://bugzilla.redhat.com/show_bug.cgi?id=963260
- http://www.ubuntu.com/usn/USN-1983-1
- http://www.ubuntu.com/usn/USN-1985-1
- http://bugs.python.org/issue17980
- http://www.openwall.com/lists/oss-security/2013/05/16/6
- http://www.ubuntu.com/usn/USN-1984-1
- http://rhn.redhat.com/errata/RHSA-2014-1690.html
- https://access.redhat.com/errata/RHSA-2016:1166