Detect Wing FTP Server Information Disclosure via Error Messages (CVE-2025-47813) in Elastic Security
Detects potential exploitation of CVE-2025-47813, an information disclosure vulnerability in Wing FTP Server (CWE-209) where detailed error messages expose sensitive server-side information. This vulnerability is actively exploited in the wild (CISA KEV). Attackers may probe the FTP server with malformed or unexpected requests to trigger verbose error responses revealing internal paths, software versions, configuration details, or stack traces.
MITRE ATT&CK
- Tactic
- Discovery Reconnaissance
Elastic Detection Query
sequence by host.name with maxspan=10m
[network where event.type == "connection" and destination.port in (21, 990, 989) and
(process.name like~ "wftpd*" or process.name like~ "wingftp*" or process.executable like~ "*Wing FTP*")]
[process where event.type == "start" and
(process.name like~ "wftpd*" or process.parent.name like~ "wftpd*") and
process.args_count > 0]
[any where event.dataset == "system.syslog" and
(message like~ "*error*" or message like~ "*exception*" or message like~ "*stack trace*") and
(message like~ "*path*" or message like~ "*version*" or message like~ "*config*")]EQL sequence detection correlating Wing FTP Server network connections with subsequent process activity and verbose error log entries that may indicate information disclosure exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate FTP clients triggering benign error sequences during normal operations
- System administrators reviewing FTP server logs coinciding with error events
- Automated monitoring solutions generating correlated events during health checks
- FTP server restarts or configuration reloads producing coincidental error log bursts
Other platforms for CVE-2025-47813
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 1Trigger Wing FTP Server Verbose Error via Invalid Command
Expected signal: Wing FTP Server access logs show connection from test host with invalid command responses. Network capture shows FTP control channel responses with error codes 500/502 and potentially verbose message bodies.
- Test 2Enumerate Wing FTP Server Version via Banner Grabbing and Error Probing
Expected signal: Network logs show sequential FTP connections from test host. Wing FTP Server logs record failed auth attempts and invalid CWD commands with server-generated error responses.
- Test 3Simulate Automated Scanner Probing Wing FTP Server Error Responses
Expected signal: Wing FTP Server logs show burst of varied FTP commands from single source IP including SYST, STAT, FEAT commands that reveal version/feature information, plus error responses to invalid path and command inputs.
Unlock Pro Content
Get the full detection package for CVE-2025-47813 including response playbook, investigation guide, and atomic red team tests.