UBUNTU-CVE-2023-6918

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    UBUNTU-CVE-2023-6918

    Published: 19 Dec 2023Last Modified: 22 Apr 2026
    Upstream:
    CVE-2023-6918

    Summary:

    Details: A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

    References: https://ubuntu.com/security/CVE-2023-6918, https://access.redhat.com/security/cve/CVE-2023-6918, https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/, https://www.libssh.org/security/advisories/CVE-2023-6918.txt, https://ubuntu.com/security/notices/USN-6592-1, https://ubuntu.com/security/notices/USN-6592-2, https://www.cve.org/CVERecord?id=CVE-2023-6918

    Affected packages

    Package

    Name: libssh

    Purl: pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.6.3-4.3ubuntu0.6+esm1

    Affected versions

    0.6.3-3ubuntu3
    0.6.3-4.1
    0.6.3-4.2
    0.6.3-4.2ubuntu1
    0.6.3-4.3
    0.6.3-4.3ubuntu0.1
    0.6.3-4.3ubuntu0.2
    0.6.3-4.3ubuntu0.5
    0.6.3-4.3ubuntu0.6

    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