Detect Wing FTP Server Information Disclosure via Error Messages (CVE-2025-47813) in CrowdStrike LogScale
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
LogScale Detection Query
// Wing FTP Server Information Disclosure Detection - CVE-2025-47813
#event_simpleName IN (NetworkConnectIP4, NetworkConnectIP6, ProcessRollup2, SyntheticProcessRollup2)
| FileName IN ("wftpd.exe", "wftpserver.exe", "wingftpserver.exe") OR
ImageFileName CONTAINS "Wing FTP" OR
CommandLine CONTAINS "wftpd" OR
CommandLine CONTAINS "wingftp"
| eval is_ftp_process = if(FileName IN ("wftpd.exe", "wftpserver.exe", "wingftpserver.exe"), true, false)
| join type=inner [
#event_simpleName=NetworkConnectIP4
| RemotePort IN (21, 989, 990)
| stats count() as connection_count, values(RemoteAddressIP4) as remote_ips by aid, LocalPort
] aid aid
| where is_ftp_process = true
| stats
count() as event_count,
values(FileName) as processes,
values(CommandLine) as cmd_lines,
values(remote_ips) as connecting_ips,
sum(connection_count) as total_connections
by aid, ComputerName, UserName
| where total_connections > 10
| eval severity = case(
total_connections > 50, "critical",
total_connections > 20, "high",
true(), "medium"
)
| sort -total_connectionsCrowdStrike Falcon/LogScale query identifying Wing FTP Server process activity with anomalous connection volumes that may indicate active exploitation of CVE-2025-47813 information disclosure.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate high-volume FTP transfers to Wing FTP Server from authorized clients
- FTP server hosting public file repositories with naturally high connection counts
- Automated backup systems performing frequent connections to the FTP server
- Load balancers or proxy servers aggregating many client connections appearing as high volume
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.