CVE-2019-25711: SpotFTP Password Recover DoS Vulnerability

CVE-2019-25711 Overview

CVE-2019-25711 is a denial of service vulnerability affecting SpotFTP Password Recover version 2.4.2. The application fails to properly validate the length of user-supplied input in the Name field during the registration process. Local attackers can exploit this flaw by supplying an oversized buffer (256 bytes or more) in the Name input field, causing the application to crash when submitting the registration code.

Critical Impact

Local attackers can crash the SpotFTP Password Recover application by providing a 256-byte payload in the Name field during registration, causing a denial of service condition.

Affected Products

• SpotFTP Password Recover 2.4.2

Discovery Timeline

• 2026-04-12 - CVE-2019-25711 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2019-25711

Vulnerability Analysis

This vulnerability stems from insufficient input validation in the SpotFTP Password Recover application's registration functionality. When a user attempts to register the software, the application accepts input in the Name field without properly checking the length of the supplied data. The application allocates a fixed-size buffer for this input, but does not enforce boundary checks before copying user data into the buffer.

The vulnerability is classified under CWE-807 (Reliance on Untrusted Inputs in a Security Decision), though the behavior also exhibits characteristics of a classic buffer overflow condition. When an attacker supplies a payload of 256 bytes or more, the excessive data overflows the allocated buffer space, corrupting adjacent memory and causing the application to crash.

This is a local attack vector, meaning the attacker must have local access to the system running the vulnerable software. The attack requires no special privileges and no user interaction beyond the attacker's own actions.

Root Cause

The root cause of this vulnerability is improper input validation in the registration Name field. The application does not enforce proper boundary checks on user-supplied data, allowing oversized input to overflow internal buffers. The lack of input length validation before processing the registration data leads to memory corruption and application instability.

Attack Vector

The attack is executed locally by an attacker who has access to the SpotFTP Password Recover application. The exploitation process involves generating a payload of 256 bytes or more, pasting this payload into the Name input field during the software registration process, and then submitting the registration code. Upon submission, the oversized buffer causes memory corruption, resulting in an immediate application crash.

The attacker does not need elevated privileges to perform this attack. The vulnerability can be triggered through normal user interaction with the application's registration interface. For detailed technical information about the exploitation technique, refer to the Exploit-DB entry #46088.

Detection Methods for CVE-2019-25711

Indicators of Compromise

• Unexpected crashes of the SpotFTP Password Recover application
• Windows Event Log entries indicating application faults or access violations in the SpotFTP process
• Presence of unusually large text strings in registration-related input fields or configuration files

Detection Strategies

• Monitor for repeated application crashes of SpotFTP Password Recover processes
• Implement application whitelisting to detect unauthorized modifications or interactions with the vulnerable software
• Review endpoint logs for signs of buffer overflow exploitation attempts

Monitoring Recommendations

• Configure endpoint detection solutions to alert on application crashes associated with SpotFTP Password Recover
• Monitor process memory usage patterns for anomalies that may indicate exploitation attempts
• Review system stability logs for recurring faults in password recovery utilities

How to Mitigate CVE-2019-25711

Immediate Actions Required

• Discontinue use of SpotFTP Password Recover version 2.4.2 until a patched version is available
• Restrict local access to systems where the vulnerable software is installed
• Consider using alternative FTP password recovery tools that have been audited for security vulnerabilities
• Implement application control policies to prevent unauthorized execution of the vulnerable software

Patch Information

No vendor patch information is currently available for this vulnerability. Users should check the VulnCheck Advisory for updates on remediation guidance and monitor for any vendor communications regarding security fixes.

Workarounds

• Limit access to the vulnerable application to trusted users only
• Consider deploying the application in a sandboxed environment to contain potential crashes
• Remove the vulnerable software if it is not essential to business operations
• Monitor for and block attempts to input excessively long strings into the application

# Restrict execution of vulnerable application (Windows example)
# Use Software Restriction Policies or AppLocker to limit execution
# Example AppLocker rule to block SpotFTP Password Recover
# New-AppLockerPolicy -RuleType Path -Path "C:\Program Files\SpotFTP\*" -Action Deny