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    2 vulnerabilities by neocturne

    CVE-2025-24356 (GCVE-0-2025-24356)

    Vulnerability from cvelistv5 – Published: 2025-01-27 17:31 – Updated: 2025-01-28 15:39
    VLAI
    Title
    UDP traffic amplification via fastd's fast reconnect feature
    Summary
    fastd is a VPN daemon which tunnels IP packets and Ethernet frames over UDP. When receiving a data packet from an unknown IP address/port combination, fastd will assume that one of its connected peers has moved to a new address and initiate a reconnect by sending a handshake packet. This "fast reconnect" avoids having to wait for a session timeout (up to ~90s) until a new connection is established. Even a 1-byte UDP packet just containing the fastd packet type header can trigger a much larger handshake packet (~150 bytes of UDP payload). Including IPv4 and UDP headers, the resulting amplification factor is roughly 12-13. By sending data packets with a spoofed source address to fastd instances reachable on the internet, this amplification of UDP traffic might be used to facilitate a Distributed Denial of Service attack. This vulnerability is fixed in v23.
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-405 - Asymmetric Resource Consumption (Amplification)
    Assigner
    References
    Impacted products
    Vendor Product Version
    neocturne fastd Affected: < 23
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2025-24356 (GCVE-0-2025-24356)

    Vulnerability from nvd – Published: 2025-01-27 17:31 – Updated: 2025-01-28 15:39
    VLAI
    Title
    UDP traffic amplification via fastd's fast reconnect feature
    Summary
    fastd is a VPN daemon which tunnels IP packets and Ethernet frames over UDP. When receiving a data packet from an unknown IP address/port combination, fastd will assume that one of its connected peers has moved to a new address and initiate a reconnect by sending a handshake packet. This "fast reconnect" avoids having to wait for a session timeout (up to ~90s) until a new connection is established. Even a 1-byte UDP packet just containing the fastd packet type header can trigger a much larger handshake packet (~150 bytes of UDP payload). Including IPv4 and UDP headers, the resulting amplification factor is roughly 12-13. By sending data packets with a spoofed source address to fastd instances reachable on the internet, this amplification of UDP traffic might be used to facilitate a Distributed Denial of Service attack. This vulnerability is fixed in v23.
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-405 - Asymmetric Resource Consumption (Amplification)
    Assigner
    References
    Impacted products
    Vendor Product Version
    neocturne fastd Affected: < 23
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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