CVE-2026-40093 Nimiq区块链时间戳验证漏洞

// Conceptual PoC for Nimiq Blockchain Timestamp Validation Bypass // This demonstrates the missing upper bound check in the validation logic. use std::time::{SystemTime, UNIX_EPOCH}; // Simplified structure of a Block struct Block { timestamp: u64, parent_timestamp: u64, is_skip_block: bool, } // Vulnerable Validation Logic (Conceptual) fn validate_block_vulnerable(block: &Block, current_time: u64) -> bool { let min_timeout = 1000; // Example MIN_PRODUCER_TIMEOUT // Check lower bounds as per the description if block.is_skip_block { if block.timestamp != block.parent_timestamp + min_timeout { return false; } } else { if block.timestamp < block.parent_timestamp { return false; } } // VULNERABILITY: No check against current_time (wall clock) // e.g., if block.timestamp > current_time + MAX_DRIFT { return false; } true // Block accepted even if timestamp is year 3000 } // Attack Simulation fn main() { let current_time = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(); let parent_ts = current_time; // Malicious block with timestamp far in the future let malicious_block = Block { timestamp: current_time + 1_000_000_000, // 31 years in the future parent_timestamp: parent_ts, is_skip_block: false, }; if validate_block_vulnerable(&malicious_block, current_time) { println!("PoC: Malicious block accepted! Inflation attack triggered."); } else { println!("Block rejected."); } }