CVE-2013-4314

Advisory

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.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

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.


MLIST:[oss-security] 20130906 Re: CVE request: pyOpenSSL hostname check bypassing vulnerability: http://www.openwall.com/lists/oss-security/2013/09/06/2
MLIST:[pyOpenSSL-Users] 20130904 pyOpenSSL 0.13.1: https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html
CONFIRM:https://bugzilla.redhat.com/show_bug.cgi?id=1005325: https://bugzilla.redhat.com/show_bug.cgi?id=1005325
DEBIAN:DSA-2763: http://www.debian.org/security/2013/dsa-2763
SUSE:openSUSE-SU-2013:1648: http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html
UBUNTU:USN-1965-1: http://www.ubuntu.com/usn/USN-1965-1

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4314
• 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