UBUNTU-CVE-2016-7055

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    UBUNTU-CVE-2016-7055

    Published: 11 Nov 2016Last Modified: 22 Apr 2026
    Upstream:
    CVE-2016-7055
    Aliases:
    USN-3181-1

    Summary:

    Details: There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

    References: https://ubuntu.com/security/CVE-2016-7055, https://www.openssl.org/news/secadv/20161110.txt, https://www.openssl.org/news/secadv/20170126.txt, https://ubuntu.com/security/notices/USN-3181-1, https://www.cve.org/CVERecord?id=CVE-2016-7055

    Affected packages

    Package

    Name: openssl

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.0.2g-1ubuntu4.6

    Affected versions

    1.0.2d-0ubuntu1
    1.0.2d-0ubuntu2
    1.0.2e-1ubuntu1
    1.0.2f-2ubuntu1
    1.0.2g-1ubuntu2
    1.0.2g-1ubuntu3
    1.0.2g-1ubuntu4
    1.0.2g-1ubuntu4.1
    1.0.2g-1ubuntu4.2
    1.0.2g-1ubuntu4.4
    1.0.2g-1ubuntu4.5

    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
    UBUNTU-CVE-2016-7055 | CVE-DB