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Vulnerability Details : CVE-2013-4314

The X509Extension in pyOpenSSL before 0.13.1 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.
Publish Date : 2013-09-30 Last Update Date : 2013-12-08
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)

- Related OVAL Definitions

Title Definition Id Class Family
DSA-2763-1 pyopenssl - hostname check bypassing oval:org.mitre.oval:def:19756 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2013-4314

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 10.04 - LTS Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 12.04 - LTS Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 12.10 Version Details Vulnerabilities
4 OS Canonical Ubuntu Linux 13.04 Version Details Vulnerabilities
5 Application Jean-paul Calderone Pyopenssl 0.7 Version Details Vulnerabilities
6 Application Jean-paul Calderone Pyopenssl 0.8 A1 Version Details Vulnerabilities
7 Application Jean-paul Calderone Pyopenssl 0.9 Version Details Vulnerabilities
8 Application Jean-paul Calderone Pyopenssl 0.10 Version Details Vulnerabilities
9 Application Jean-paul Calderone Pyopenssl 0.11 A2 Version Details Vulnerabilities
10 Application Jean-paul Calderone Pyopenssl 0.11 Version Details Vulnerabilities
11 Application Jean-paul Calderone Pyopenssl 0.11 A1 Version Details Vulnerabilities
12 Application Jean-paul Calderone Pyopenssl 0.12 Version Details Vulnerabilities
13 Application Jean-paul Calderone Pyopenssl 0.13 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 4
Jean-paul Calderone Pyopenssl 9

- References For CVE-2013-4314
SUSE openSUSE-SU-2013:1648
MLIST [oss-security] 20130906 Re: CVE request: pyOpenSSL hostname check bypassing vulnerability
MLIST [pyOpenSSL-Users] 20130904 pyOpenSSL 0.13.1 CONFIRM

- Metasploit Modules Related To CVE-2013-4314

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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