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Clarify warm boot attack mitigtions and scope for Bellatrix

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Signed-off-by: Joachim Strömbergson <joachim@assured.se>
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Joachim Strömbergson 2023-04-12 11:15:05 +02:00 committed by dehanj
parent 6d0a761e65
commit 3d787886b6
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1 changed files with 18 additions and 10 deletions
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doc/threat_model/threat_model.md
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@ -29,7 +29,7 @@ manner.
fabric besides the configuration circuit. fabric besides the configuration circuit.
* There exist a possible warm boot attack against the Lattice iCE40 * There exist a possible warm boot attack against the Lattice iCE40
UltraPlus FPGAs which allows an attacker with physical access to UltraPlus FPGAs, which allows an attacker with physical access to
load a FPGA configuration even though the NVCM has been programmed load a FPGA configuration even though the NVCM has been programmed
and locked. and locked.
@ -174,14 +174,18 @@ This threat model will be updated for each release of the TKey device.
For each version we description what threats are in scope, what threats For each version we description what threats are in scope, what threats
are out of scope and what mitigations are in place. are out of scope and what mitigations are in place.
### TK1-23.03 ### TK1-23.03.1-Bellatrix
This is the first general release of the TKey TK1 device. In this This is the first general release of the TKey TK1 device. In this
device the FPGA bitstream is stored and locked into the NVCM. The UDS device the FPGA bitstream is stored and locked into the NVCM. The UDS
and UDI assets are stored as part of the FPGA bitstream. The FPGA and UDI assets are stored as part of the FPGA bitstream.
design contain some mechanisms for execution protection, execution
monitoring as well as functionality designed to make evil maid attacks The FPGA design contain some mechanisms for execution protection,
harder to successfully perform, i.e. take longer time. execution monitoring as well as functionality designed to make warm
boot based evil maid attacks harder to successfully perform, i.e. take
longer time. Moreover the transparent TKey casing is glued together
which makes it harder to open up without leaving physical marks
indicating tamper attempts.
The FPGA design as well as the firmware has been audited, and The FPGA design as well as the firmware has been audited, and
hardening of these has been performed to some degree. For more hardening of these has been performed to some degree. For more
@ -201,10 +205,10 @@ modification of the firmware CH552.
#### In scope #### In scope
- SW attacks from the host against the firmware in the FPGA, and the - SW attacks from the host against the firmware in the FPGA as well as
FPGA design itself via the USB host interface. the FPGA design itself via the USB host interface.
- Timing attacks on the firmware in the FPGA. - Timing attacks on the firmware and the FPGA design.
#### Out of scope #### Out of scope
@ -212,7 +216,11 @@ modification of the firmware CH552.
- Faulting of the execution by the CPU in the FPGA and the CH552 MCU - Faulting of the execution by the CPU in the FPGA and the CH552 MCU
- EM leakage - EM leakage
- Attacks on the TKey device apps - Warm boot attacks. It should be hard to successfully perform against
the TKey, but the attack is not yet fully mitigated.
- Attacks on the TKey device apps.
### engineering-release-1 ### engineering-release-1