Detect Gladinet CentreStack/Triofox Unauthorized File/Directory Access (CVE-2025-11371) in Google Chronicle
Detects exploitation of CVE-2025-11371, a CWE-552 vulnerability in Gladinet CentreStack and Triofox where files or directories are accessible to external parties without proper authorization. This CISA KEV-listed vulnerability allows unauthenticated or unauthorized actors to access sensitive files and directories exposed by the affected file-sharing platform.
MITRE ATT&CK
- Tactic
- Collection Exfiltration
YARA-L Detection Query
rule cve_2025_11371_gladinet_unauthorized_access {
meta:
author = "df00tech"
description = "Detects CVE-2025-11371 - Gladinet CentreStack/Triofox unauthorized file/directory access by external parties"
severity = "HIGH"
reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-11371"
events:
$http.metadata.event_type = "NETWORK_HTTP"
$http.network.http.response_code = /^(200|206|301|302)$/
(
$http.network.http.request_url = /(?i)\/(storage|files|share|download|content)\// or
$http.network.http.request_url = /(?i)(\.\.[\/\\]|%2e%2e|%252e%252e)/ or
$http.network.http.request_url = /(?i)\/(web\.config|appsettings|\.ssh|etc\/passwd)/
)
not $http.principal.ip = /^(10\.|172\.(1[6-9]|2[0-9]|3[01])\.|192\.168\.)/
condition:
$http
}Chronicle YARA-L rule detecting HTTP responses indicating successful external access to file/directory endpoints on Gladinet CentreStack or Triofox infrastructure.
Data Sources
Required Tables
False Positives & Tuning
- External authenticated users with legitimate access to shared file repositories
- Third-party integration services polling file endpoints via API
- Security tools performing authorized reconnaissance during assessment periods
- GCP Cloud Armor health probes against storage service endpoints
Other platforms for CVE-2025-11371
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Unauthenticated File Enumeration via CentreStack Storage Endpoint
Expected signal: IIS access logs will show HTTP GET requests to /storage/, /files/, /share/ etc. from the test IP with no authentication headers. Responses of 200/206 indicate the vulnerability is present.
- Test 2Path Traversal Attempt Against CentreStack File Server
Expected signal: Web server logs will contain requests with URL-encoded traversal sequences. Windows Security Event Log Event ID 4663 may fire if file auditing is enabled and a real file is accessed.
- Test 3Bulk File Download Simulation from External IP
Expected signal: IIS logs will show high-volume sequential GET requests from a single external IP with large response sizes (sc-bytes). Network flow data will show sustained outbound data transfer to the test IP.
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