CVE-2013-4238

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    CVE-2013-4238

    Published: 18 Aug 2013Last Modified: 16 Apr 2026

    Summary:

    Details: 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.

    References: http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.html, http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.html, http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.html, http://lists.opensuse.org/opensuse-updates/2013-09/msg00029.html, http://lists.opensuse.org/opensuse-updates/2013-09/msg00042.html, http://lists.opensuse.org/opensuse-updates/2013-09/msg00043.html, http://rhn.redhat.com/errata/RHSA-2013-1582.html, http://www.debian.org/security/2014/dsa-2880, http://www.ubuntu.com/usn/USN-1982-1, http://www.vmware.com/security/advisories/VMSA-2014-0012.html, http://bugs.python.org/issue18709, https://bugzilla.redhat.com/show_bug.cgi?id=996381, http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html, http://seclists.org/fulldisclosure/2014/Dec/23, http://www.securityfocus.com/archive/1/534161/100/0/threaded

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High