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2 vulnerabilities by fastd_project
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 ?
CWE
- CWE-405 - Asymmetric Resource Consumption (Amplification)
Assigner
References
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CVE-2020-27638 (GCVE-0-2020-27638)
Vulnerability from cvelistv5 – Published: 2020-10-22 12:27 – Updated: 2024-08-04 16:18
VLAI?
Summary
receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.
Severity ?
No CVSS data available.
CWE
- n/a
Assigner
References
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