CVE-2013-4238

The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 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, a related issue to CVE-2009-2408.

• CWE-20

• http://bugs.python.org/issue18709Patch
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00029.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00042.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00043.htmlVendor Advisory
• http://rhn.redhat.com/errata/RHSA-2013-1582.html
• http://seclists.org/fulldisclosure/2014/Dec/23
• http://www.debian.org/security/2014/dsa-2880
• http://www.securityfocus.com/archive/1/534161/100/0/threaded
• http://www.ubuntu.com/usn/USN-1982-1Vendor Advisory
• http://www.vmware.com/security/advisories/VMSA-2014-0012.html
• https://bugzilla.redhat.com/show_bug.cgi?id=996381Patch
• http://bugs.python.org/issue18709Patch
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00029.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00042.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-09/msg00043.htmlVendor Advisory
• http://rhn.redhat.com/errata/RHSA-2013-1582.html
• http://seclists.org/fulldisclosure/2014/Dec/23
• http://www.debian.org/security/2014/dsa-2880
• http://www.securityfocus.com/archive/1/534161/100/0/threaded
• http://www.ubuntu.com/usn/USN-1982-1Vendor Advisory
• http://www.vmware.com/security/advisories/VMSA-2014-0012.html
• https://bugzilla.redhat.com/show_bug.cgi?id=996381Patch

Published

Aug 18, 2013

Last Modified

Jun 16, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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