Published: 30/09/2013 Updated: 08/12/2013

CVSS v2 Base Score: 4.3 | Impact Score: 2.9 | Exploitability Score: 8.6

VMScore: 383

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

The X509Extension in pyOpenSSL prior to 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 malicious users to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.

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jean-paul calderone pyopenssl 0.11
jean-paul calderone pyopenssl 0.10
jean-paul calderone pyopenssl 0.9
jean-paul calderone pyopenssl 0.8
jean-paul calderone pyopenssl
jean-paul calderone pyopenssl 0.12
jean-paul calderone pyopenssl 0.7
canonical ubuntu linux 12.04
canonical ubuntu linux 13.04
canonical ubuntu linux 10.04
canonical ubuntu linux 12.10

Debian Bug report logs - #722055 python-openssl: CVE-2013-4314: hostname check bypassing vulnerability Package: python-openssl; Maintainer for python-openssl is Sandro Tosi <morph@debianorg>; Source for python-openssl is src:pyopenssl (PTS, buildd, popcon) Reported by: Henri Salo <henri@nervfi> Date: Sat, 7 Sep 20 ...

Fraudulent security certificates could allow sensitive information to be exposed when accessing the Internet ...

It was discovered that PyOpenSSL, a Python wrapper around the OpenSSL library, does not properly handle certificates with NULL characters in the Subject Alternative Name field A remote attacker in the position to obtain a certificate for 'wwwfooorg\0examplecom' from a CA that a SSL client trusts, could use this to spoof wwwfooorg and conduct ...

The X509Extension in pyOpenSSL before 0131 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority ...

CWE-20 http://www.openwall.com/lists/oss-security/2013/09/06/2 https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html https://bugzilla.redhat.com/show_bug.cgi?id=1005325 http://www.ubuntu.com/usn/USN-1965-1 http://www.debian.org/security/2013/dsa-2763 http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=722055 https://usn.ubuntu.com/1965-1/https://nvd.nist.gov https://access.redhat.com/security/cve/cve-2013-4314

CVE-2013-4314

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