UBUNTU-CVE-2019-1551

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    UBUNTU-CVE-2019-1551

    Published: 6 Dec 2019Last Modified: 22 Apr 2026
    Upstream:
    CVE-2019-1551

    Summary:

    Details: There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).

    References: https://ubuntu.com/security/CVE-2019-1551, https://www.openssl.org/news/secadv/20191206.txt, https://ubuntu.com/security/notices/USN-4376-1, https://ubuntu.com/security/notices/USN-4504-1, https://www.cve.org/CVERecord?id=CVE-2019-1551

    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-1ubuntu4.16

    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
    1.0.2g-1ubuntu4.6
    1.0.2g-1ubuntu4.8
    1.0.2g-1ubuntu4.9
    1.0.2g-1ubuntu4.10
    1.0.2g-1ubuntu4.11
    1.0.2g-1ubuntu4.12
    1.0.2g-1ubuntu4.13
    1.0.2g-1ubuntu4.14
    1.0.2g-1ubuntu4.15

    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