MGASA-2024-0004

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    MGASA-2024-0004

    Published: 8 Jan 2024Last Modified: 16 Apr 2026
    Upstream:
    CVE-2023-48795

    Summary: Updated dropbear package fixes a security vulnerability

    Details: Parts of the SSH specification are vulnerable to a novel prefix truncation attack (a.k.a. Terrapin attack), which allows a man-in-the-middle attacker to strip an arbitrary number of messages right after the initial key exchange, breaking SSH extension negotiation (RFC8308) in the process and thus downgrading connection security. ### Mitigations To mitigate this protocol vulnerability, OpenSSH suggested a so-called "strict kex" which alters the SSH handshake to ensure a Man-in-the-Middle attacker cannot introduce unauthenticated messages as well as convey sequence number manipulation across handshakes. Support for strict key exchange has been added to a variety of SSH implementations, including OpenSSH itself, PuTTY, libssh, and more. This release includes a patch to implement Strict KEX mode.

    References: https://advisories.mageia.org/MGASA-2024-0004.html, https://bugs.mageia.org/show_bug.cgi?id=32656, https://github.com/mkj/dropbear/commit/6e43be5c7b99dbee49dc72b6f989f29fdd7e9356

    Affected packages

    Package

    Name: dropbear

    Purl: pkg:rpm/mageia/dropbear?arch=source&distro=mageia-9

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2022.83-2.1.mga9

    Affected versions

    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
    MGASA-2024-0004 | CVE-DB