CVE-2016-0772

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the client and the registry to block the StartTLS command, aka a \"StartTLS stripping attack.\""}, {"lang": "es", "value": "La librer\u00eda smtplib en CPython (tambi\u00e9n conocido como Python) en versiones anteriores a 2.7.12, 3.x en versiones anteriores a 3.4.5 y 3.5.x en versiones anteriores a 3.5.2 no devuelve un error cuando StartTLS falla, lo que podr\u00eda permitir a atacantes man-in-the-middle eludir las protecciones TLS mediante el aprovechamiento de una posici\u00f3n de red entre el cliente y el registro para bloquear el comando StartTLS, tambi\u00e9n conocido como un \"ataque de decapado StartTLS\"."}], "id": "CVE-2016-0772", "lastModified": "2026-06-17T00:38:11.783", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": 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{"affected_release": [{"advisory": "RHSA-2016:1626", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "python-0:2.6.6-66.el6_8", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1626", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "python-0:2.7.5-38.el7_2", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1628", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el6", "package": "python27-python-0:2.7.8-18.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1629", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el6", "package": "python33-python-0:3.3.2-18.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1630", "cpe": 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{"advisory": "RHSA-2016:1628", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el6", "package": "python27-python-0:2.7.8-18.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1629", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el6", "package": "python33-python-0:3.3.2-18.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1630", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el6", "package": "rh-python34-python-0:3.4.2-14.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1627", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "rh-python35-python-0:3.5.1-9.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1628", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "python27-python-0:2.7.8-16.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1629", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "python33-python-0:3.3.2-16.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1630", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "rh-python34-python-0:3.4.2-13.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1627", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "rh-python35-python-0:3.5.1-9.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1628", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "python27-python-0:2.7.8-16.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1629", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "python33-python-0:3.3.2-16.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1630", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "rh-python34-python-0:3.4.2-13.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1627", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "rh-python35-python-0:3.5.1-9.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1628", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "python27-python-0:2.7.8-16.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1629", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "python33-python-0:3.3.2-16.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS", "release_date": "2016-08-18T00:00:00Z"}, {"advisory": "RHSA-2016:1630", "cpe": "cpe:/a:redhat:rhel_software_collections:2::el7", "package": "rh-python34-python-0:3.4.2-13.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS", "release_date": "2016-08-18T00:00:00Z"}], "bugzilla": {"description": "python: smtplib StartTLS stripping attack", "id": "1303647", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1303647"}, "csaw": false, "cvss": {"cvss_base_score": "5.8", "cvss_scoring_vector": "AV:N/AC:M/Au:N/C:P/I:P/A:N", "status": "verified"}, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "verified"}, "details": ["The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a \"StartTLS stripping attack.\"", "It was found that Python's smtplib library did not return an exception when StartTLS failed to be established in the SMTP.starttls() function. A man in the middle attacker could strip out the STARTTLS command without generating an exception on the Python SMTP client application, preventing the establishment of the TLS layer."], "name": "CVE-2016-0772", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "python", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2016-06-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-0772\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-0772"], "threat_severity": "Moderate"}

{}