Reading Mifare security code blocks - zeroed key A

[simonemarfo]

Hi all,
I am having issues in with hf mf rdbl command.
I have tried with different tags, but in all cases Key A in the security code blocks always comes up as zeroed.

[USB] chameleon --> hw version
 - Chameleon Ultra, Version: v2.0 (v2.0.0-131-gc1eb213)
[USB] chameleon --> hf mf rdbl -a -k FFFFFFFFFFFF --blk 7
 - Data: 000000000000ff078069ffffffffffff
[USB] chameleon --> hf mf rdbl -b -k FFFFFFFFFFFF --blk 7
 - Data: 000000000000ff078069ffffffffffff

Here reported the partial dump of the same tag

00000040: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00000050: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00000060: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00000070: ffff ffff ffff ff07 8069 ffff ffff ffff  .........i......

To Reproduce

Steps to reproduce the behavior.

1. Install latest FW ( and any previous for this matter )
2. Read security code block (3, 7, ... ) with hf mf rdbl providing the correct auth key

Expected behavior

Key A should be readable and not zeroed