CVE-2018-25234 Overview
CVE-2018-25234 is a denial of service vulnerability in SmartFTP Client 9.0.2615.0. A local attacker can crash the application by supplying an excessively long string in the Host connection parameter. Pasting a buffer of 300 repeated characters into the Host field reliably triggers an unhandled condition that terminates the client process. The flaw is categorized under [CWE-466] (Return of Pointer Value Outside of Expected Range) and affects availability of the FTP client. No code execution or data disclosure has been associated with this issue. The vulnerability requires local interaction with the SmartFTP user interface and does not impact confidentiality or integrity.
Critical Impact
Local users can crash SmartFTP Client 9.0.2615.0 by submitting a 300-character string in the Host field, disrupting FTP workflows.
Affected Products
- SmartFTP Client 9.0.2615.0
- SmartFTP Client versions sharing the vulnerable Host field handling
- Windows installations running the affected SmartFTP build
Discovery Timeline
- 2026-03-30 - CVE-2018-25234 published to NVD
- 2026-04-08 - Last updated in NVD database
Technical Details for CVE-2018-25234
Vulnerability Analysis
The vulnerability resides in the connection dialog of SmartFTP Client 9.0.2615.0. The Host parameter accepts user-supplied input without enforcing a proper length boundary before downstream processing. When a string of approximately 300 repeated characters is pasted into the Host field, the application encounters an unhandled exception and terminates. The defect aligns with [CWE-466], where a pointer or value falls outside the expected range during input handling. Because the attack vector is local and the client process is the only affected component, the impact is limited to denial of service for the interactive user. Refer to the VulnCheck Advisory: SmartFTP DoS for the original technical disclosure.
Root Cause
The root cause is insufficient input validation on the Host connection parameter. SmartFTP fails to truncate, sanitize, or reject overly long strings before they reach internal parsing routines. The resulting boundary condition produces an out-of-range value that crashes the client.
Attack Vector
Exploitation requires local user interaction with the SmartFTP GUI. An attacker with local access pastes a buffer of 300 repeated characters into the Host field and initiates a connection, causing the application to crash. The flaw cannot be triggered remotely over the network.
No verified proof-of-concept code is included here. Public exploit details are available at Exploit-DB #45759.
Detection Methods for CVE-2018-25234
Indicators of Compromise
- Repeated unexpected terminations of the SmartFTP.exe process on endpoints running version 9.0.2615.0.
- Windows Application event log entries showing application crashes tied to SmartFTP with faulting module references.
- User reports of the SmartFTP client closing immediately after pasting connection details.
Detection Strategies
- Monitor Windows Error Reporting and Application crash logs for SmartFTP.exe faults across managed endpoints.
- Inventory installed SmartFTP versions through endpoint management tooling to identify hosts running 9.0.2615.0 or earlier.
- Correlate crash events with recent clipboard paste activity in the SmartFTP UI where telemetry is available.
Monitoring Recommendations
- Track process termination telemetry for FTP client binaries and alert on repeated abnormal exits.
- Audit software inventory reports for outdated SmartFTP installations on a recurring schedule.
- Review user-reported application instability tickets that reference FTP client crashes.
How to Mitigate CVE-2018-25234
Immediate Actions Required
- Upgrade SmartFTP Client to the latest version available from the SmartFTP Download Page.
- Identify and inventory all endpoints running SmartFTP 9.0.2615.0 for prioritized remediation.
- Restrict local access to systems running the vulnerable client until patching is complete.
Patch Information
SmartFTP publishes current builds on its official site. Administrators should deploy the latest release that supersedes 9.0.2615.0 to remove the vulnerable Host field handling. Validate the installed version after deployment to confirm remediation.
Workarounds
- Instruct users to avoid pasting untrusted or excessively long strings into the SmartFTP Host field.
- Limit interactive logon rights on shared workstations where SmartFTP is installed.
- Apply application allowlisting to ensure only approved SmartFTP versions can execute on managed endpoints.
# Example: query installed SmartFTP version on Windows endpoints
wmic product where "Name like 'SmartFTP%%'" get Name,Version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
