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[FL-2985] Fix U2F HID vulnerability #2042

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Co-authored-by: あく <alleteam@gmail.com>
This commit is contained in:
Nikolay Minaylov 2022-11-23 21:12:53 +03:00 committed by GitHub
parent 51d478489a
commit ffa6249b64
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 18 additions and 3 deletions
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21
applications/main/u2f/u2f_hid.c
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@ -58,13 +58,13 @@ struct U2fHid_packet {
struct U2fHid { struct U2fHid {
FuriThread* thread; FuriThread* thread;
FuriTimer* lock_timer; FuriTimer* lock_timer;
struct U2fHid_packet packet;
uint8_t seq_id_last; uint8_t seq_id_last;
uint16_t req_buf_ptr; uint16_t req_buf_ptr;
uint32_t req_len_left; uint32_t req_len_left;
uint32_t lock_cid; uint32_t lock_cid;
bool lock; bool lock;
U2fData* u2f_instance; U2fData* u2f_instance;
struct U2fHid_packet packet;
}; };
static void u2f_hid_event_callback(HidU2fEvent ev, void* context) { static void u2f_hid_event_callback(HidU2fEvent ev, void* context) {
@ -215,10 +215,21 @@ static int32_t u2f_hid_worker(void* context) {
} }
if(flags & WorkerEvtRequest) { if(flags & WorkerEvtRequest) {
uint32_t len_cur = furi_hal_hid_u2f_get_request(packet_buf); uint32_t len_cur = furi_hal_hid_u2f_get_request(packet_buf);
if(len_cur > 0) { do {
if(len_cur == 0) {
break;
}
if((packet_buf[4] & U2F_HID_TYPE_MASK) == U2F_HID_TYPE_INIT) { if((packet_buf[4] & U2F_HID_TYPE_MASK) == U2F_HID_TYPE_INIT) {
if(len_cur < 7) {
u2f_hid->req_len_left = 0;
break; // Wrong chunk len
}
// Init packet // Init packet
u2f_hid->packet.len = (packet_buf[5] << 8) | (packet_buf[6]); u2f_hid->packet.len = (packet_buf[5] << 8) | (packet_buf[6]);
if(u2f_hid->packet.len > U2F_HID_MAX_PAYLOAD_LEN) {
u2f_hid->req_len_left = 0;
break; // Wrong packet len
}
if(u2f_hid->packet.len > (len_cur - 7)) { if(u2f_hid->packet.len > (len_cur - 7)) {
u2f_hid->req_len_left = u2f_hid->packet.len - (len_cur - 7); u2f_hid->req_len_left = u2f_hid->packet.len - (len_cur - 7);
len_cur = len_cur - 7; len_cur = len_cur - 7;
@ -232,6 +243,10 @@ static int32_t u2f_hid_worker(void* context) {
u2f_hid->req_buf_ptr = len_cur; u2f_hid->req_buf_ptr = len_cur;
if(len_cur > 0) memcpy(u2f_hid->packet.payload, &packet_buf[7], len_cur); if(len_cur > 0) memcpy(u2f_hid->packet.payload, &packet_buf[7], len_cur);
} else { } else {
if(len_cur < 5) {
u2f_hid->req_len_left = 0;
break; // Wrong chunk len
}
// Continuation packet // Continuation packet
if(u2f_hid->req_len_left > 0) { if(u2f_hid->req_len_left > 0) {
uint32_t cid_temp = 0; uint32_t cid_temp = 0;
@ -260,7 +275,7 @@ static int32_t u2f_hid_worker(void* context) {
u2f_hid_send_error(u2f_hid, U2F_HID_ERR_INVALID_CMD); u2f_hid_send_error(u2f_hid, U2F_HID_ERR_INVALID_CMD);
} }
} }
} } while(0);
} }
if(flags & WorkerEvtUnlock) { if(flags & WorkerEvtUnlock) {
u2f_hid->lock = false; u2f_hid->lock = false;