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Proper TLV parsing for Seos

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Aaron Tulino (Aaronjamt)
2025-11-14 21:10:46 -07:00
parent 210b9a704c
commit 9ee9b1a73f
1 changed files with 11 additions and 1 deletions
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client/src/cmdhfseos.c
+11 -1
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@@ -550,14 +550,24 @@ static int select_DF_verify(uint8_t *response, uint8_t response_length, uint8_t
// Extract everything before the 8E tag
int res = PM3_EWRONGANSWER;
for (int i = 0; i < response_length; i++) {
for (int i = 0; i < response_length - 2;) {
// extract MAC
if (response[i] == 0x8E) {
if (response[i+1] != MAC_value_len) {
goto out;
}
// Ensure there's enough bytes remaining
// in the response for the full MAC
if (i+2+MAC_value_len > response_length) {
goto out;
}
memcpy(input, response, i);
memcpy(MAC_value, response + (i + 2), MAC_value_len);
res = PM3_SUCCESS;
break;
}
// skip to next tag
i += 2 + response[i+1];
}
if (res != PM3_SUCCESS) {
goto out;