PYSEC-2013-31

    Dashboard / Vulnerabilities / PYSEC-2013-31

    PYSEC-2013-31

    Published: 30 Sept 2013Last Modified: 10 Jun 2026

    Summary:

    Details: 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.

    References: 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://github.com/advisories/GHSA-6748-36qp-fx6r

    Affected packages

    Package

    Name: pyopenssl

    Purl: pkg:pypi/pyopenssl

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.13.1

    Affected versions

    0.10

    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
    PYSEC-2013-31 | CVE-DB