Vulnerability Information
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Vulnerability Title
UDP traffic amplification via fastd's fast reconnect feature
Vulnerability Description
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.
CVSS Information
N/A
Vulnerability Type
不对称的资源消耗(放大攻击)
Vulnerability Title
fastd 安全漏洞
Vulnerability Description
fastd是中国Fastdlabs团队的一个支持 Swoole 的轻量级 Web 开发框架。 fastd 23之前版本存在安全漏洞，该漏洞源于存在UDP流量放大漏洞，从而导致分布式拒绝服务攻击。
CVSS Information
N/A
Vulnerability Type
N/A