UBUNTU-CVE-2018-1000520

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    UBUNTU-CVE-2018-1000520

    Published: 26 Jun 2018Last Modified: 20 May 2026

    Summary:

    Details: ARM mbedTLS version 2.7.0 and earlier contains a Ciphersuite Allows Incorrectly Signed Certificates vulnerability in mbedtls_ssl_get_verify_result() that can result in ECDSA-signed certificates are accepted, when only RSA-signed ones should be.. This attack appear to be exploitable via Peers negotiate a TLS-ECDH-RSA-* ciphersuite. Any of the peers can then provide an ECDSA-signed certificate, when only an RSA-signed one should be accepted..

    References: https://ubuntu.com/security/CVE-2018-1000520, https://github.com/ARMmbed/mbedtls/issues/1561, https://www.cve.org/CVERecord?id=CVE-2018-1000520

    Affected packages

    Package

    Name: mbedtls

    Purl: pkg:deb/ubuntu/mbedtls?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.1.2-1

    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