XM Easy Personal FTP Server 5.8.0 - Remote Denial of Service
PoC files
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Analysis
Technical assessment
Python script that authenticates to an FTP server and creates 2000 directories via MKD commands to trigger a denial-of-service crash when a subsequent LIST command is issued.
Backdoor review
No backdoor observed in reviewed code
The supplied text is a plain Python script that automates FTP MKD commands to create many directories, intended to trigger a denial-of-service in XM Easy Personal FTP Server. No backdoor, trojan, or deceptive payload is present. The script performs only the advertised DoS behavior.
Classification basis and observed behavior
Classification basis
The artifact contains a complete Python script that actively creates 2000 directories on a target FTP server to trigger a crash, which is the definition of exploit code exercising a vulnerability.
exploits/windows/dos/10221.txt:36-114Requirements
- Valid FTP credentials (username and password) for the target server.
exploits/windows/dos/10221.txt:48-49 - Network connectivity to the target FTP server on port 21.
exploits/windows/dos/10221.txt:51-53
Observed behavior
- Connects to the target FTP server on port 21.
exploits/windows/dos/10221.txt:51-53 - Sends USER and PASS commands to authenticate.
exploits/windows/dos/10221.txt:58-60 - Creates 2000 directories using MKD commands with incrementally longer names.
exploits/windows/dos/10221.txt:62-111 - Closes the connection after creating directories.
exploits/windows/dos/10221.txt:113
Behaviors behind the backdoor verdict
Observables
- Script Behavior
- Python script connects to an FTP server, authenticates, and issues MKD commands in loops to create directories.This matches the described denial-of-service technique of uploading many files/folders to crash the server.
exploits/windows/dos/10221.txt:36-114
What the analysis did not establish
- The script creates directories but does not include the final LIST command that triggers the crash; the user must perform that step manually.
- The script uses hardcoded loops of 199 iterations each (10 loops) for a total of 1990 directories, not exactly 2000 as described in the text.
- Only the supplied text file was reviewed; no external resources or referenced tools were inspected.
- The script is not executed, so dynamic behavior cannot be confirmed.
This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.