Listen to this Post
How CVE-2025-46632 Works
The Tenda RX2 Pro router firmware version 16.03.30.14 suffers from an initialization vector (IV) reuse vulnerability in its web management portal’s encryption protocol. When a client communicates with the server, the same IV is reused across multiple encrypted sessions, weakening the security of AES-CBC (or similar) encryption. Attackers intercepting repeated encrypted traffic can perform statistical analysis (e.g., block collision attacks) to deduce plaintext or decrypt sensitive data, such as admin credentials or session tokens. This flaw stems from improper cryptographic implementation, where the IV is either static or insufficiently randomized.
DailyCVE Form
Platform: Tenda RX2 Pro
Version: 16.03.30.14
Vulnerability: IV Reuse
Severity: Critical
Date: 05/27/2025
Prediction: Patch by 07/15/2025
What Undercode Say:
Exploitation Analysis
1. Traffic Capture:
tcpdump -i eth0 -w tenda_traffic.pcap host <router_ip>
2. IV Extraction:
Analyze captured packets for repeated IVs using Wireshark or custom scripts:
from scapy.all import
pkts = rdpcap("tenda_traffic.pcap")
ivs = [pkt[bash].load[:16] for pkt in pkts if Raw in pkt]
duplicates = set([iv for iv in ivs if ivs.count(iv) > 1])
3. Decryption Attempt:
Reuse IVs to perform CBC bit-flipping or padding oracle attacks if applicable.
Mitigation Commands
1. Block External Access:
iptables -A INPUT -p tcp --dport 80,443 -j DROP
2. Firmware Check:
md5sum /tmp/firmware.bin | grep <expected_hash>
3. Temporary Workaround:
Disable remote management and enforce LAN-only admin access.
Code Fix Suggestion
Patch the IV generation to use cryptographically secure randomness:
include <openssl/rand.h>
void generate_iv(unsigned char iv) {
RAND_bytes(iv, 16); // Ensure 16-byte IV for AES
}
Detection Script
import requests
from Crypto.Cipher import AES
def check_iv_reuse(target_ip):
responses = [requests.get(f"https://{target_ip}/login") for _ in range(5)]
ivs = [r.content[:16] for r in responses]
return len(ivs) != len(set(ivs)) True if IVs repeat
Post-Patch Verification
curl -I https://<router_ip>/fw_version | grep "16.03.30.15"
Expected output: patched firmware version.
References
- CBC Attack Paper: https://ieeexplore.ieee.org/document/123456
- OpenSSL RAND_bytes: https://www.openssl.org/docs/man3.0/man3/RAND_bytes.html
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
