CVE-2025-1496: Coslat Hotspot Auth Bypass Vulnerability

CVE-2025-1496 Overview

CVE-2025-1496 is an Improper Restriction of Excessive Authentication Attempts vulnerability [CWE-307] in BG-TEK Coslat Hotspot. The product fails to enforce rate limiting or account lockout on authentication endpoints. Attackers can perform password brute forcing and authentication abuse against exposed hotspot management interfaces. All Coslat Hotspot versions prior to 6.26.0.R.20250227 are affected. The vulnerability is exploitable over the network without prior authentication or user interaction. Successful brute forcing yields credential access to the hotspot management plane.

Critical Impact
Attackers can enumerate credentials at high volume against Coslat Hotspot authentication endpoints, gaining unauthorized access to network access control functions.

Affected Products

BG-TEK Coslat Hotspot versions before 6.26.0.R.20250227
Deployments exposing the authentication interface to untrusted networks
Systems without upstream network-level authentication rate limiting

Discovery Timeline

2025-03-20 - CVE-2025-1496 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-1496

Vulnerability Analysis

The vulnerability originates in the authentication handler of Coslat Hotspot. The application accepts unlimited authentication attempts against user accounts without applying lockout, throttling, or CAPTCHA controls. Attackers can automate credential guessing using standard tools against the login endpoint. Because the attack vector is Network with low attack complexity and no privileges required, exposed instances face continuous automated attacks. Successful authentication grants access to the hotspot management surface, which controls guest access, session enforcement, and network policies. The confidentiality and integrity impact is scoped to the credentials and configuration accessible after a successful brute force. See the Coslat Blog Update February 2025 for vendor context.

Root Cause

The root cause is the absence of anti-automation controls on the authentication code path. The product does not track failed attempts per user, per source IP, or per session. Without a counter or backoff mechanism, credential stuffing and dictionary attacks proceed at wire speed.

Attack Vector

An unauthenticated remote attacker sends repeated POST requests to the Coslat Hotspot login endpoint. Automated tooling iterates through wordlists or previously breached credential pairs. The absence of lockout allows attackers to test thousands of combinations against known or default usernames such as admin. Once valid credentials are found, the attacker authenticates and inherits the associated privileges. Additional coverage is provided by USOM Notification TR-25-0075.

Detection Methods for CVE-2025-1496

Indicators of Compromise

High volume of failed authentication attempts to the Coslat Hotspot management interface from single or distributed source IPs
Successful login events immediately following bursts of failures against the same account
Authentication attempts against default or common administrative usernames such as admin or root

Detection Strategies

Correlate web server and application logs to identify repeated 401 or 403 responses followed by a 200 on the login endpoint
Alert on authentication requests exceeding a defined threshold per source IP or per user within a short time window
Baseline normal login patterns and flag deviations such as off-hours logins or logins from unexpected geographies

Monitoring Recommendations

Forward Coslat Hotspot authentication logs to a centralized logging platform for retention and correlation
Enable alerting on repeated failed logins followed by success from the same source
Monitor administrative session creation events and cross-reference with expected administrator activity

How to Mitigate CVE-2025-1496

Immediate Actions Required

Upgrade Coslat Hotspot to version 6.26.0.R.20250227 or later
Restrict access to the management interface using firewall ACLs limiting source IPs to administrative networks
Rotate all administrative and service account credentials that may have been exposed to brute force attempts
Review authentication logs for evidence of prior successful brute force activity

Patch Information

BG-TEK released a fix in Coslat Hotspot 6.26.0.R.20250227. Refer to the Coslat Blog Update February 2025 and the Siber Güvenlik Notification TR-25-0075 for release details and remediation guidance.

Workarounds

Place the management interface behind a VPN or bastion host to remove direct internet exposure
Enforce strong, unique passwords for all administrative accounts and disable unused accounts
Implement upstream rate limiting or web application firewall rules that throttle repeated POST requests to the login endpoint
Enable multi-factor authentication where supported by surrounding infrastructure

bash

# Example iptables rule limiting connections to the Coslat Hotspot login port
iptables -A INPUT -p tcp --dport 443 -m conntrack --ctstate NEW \
  -m recent --set --name COSLAT_LOGIN
iptables -A INPUT -p tcp --dport 443 -m conntrack --ctstate NEW \
  -m recent --update --seconds 60 --hitcount 10 --name COSLAT_LOGIN -j DROP