Jatin Kataria - 100 Seconds of Solitude: Defeating Cisco Trust Anchor
Demonstrates a practical bypass of Cisco Trust Anchor Module (TAm), breaking hardware-rooted secure boot on enterprise routers.
Summary
Bypassing Cisco Trust Anchor
Jatin Kataria (Principal Security Researcher, Red Balloon Security) presents research demonstrating a practical bypass of the Cisco Trust Anchor Module (TAm), Cisco's hardware root of trust implemented in a dedicated FPGA on enterprise routers and switches.
Cisco Trust Anchor Architecture
The Trust Anchor Module is an FPGA that performs cryptographic verification of the Cisco IOS image before boot, establishing a hardware root of trust that Cisco claims makes it impossible to run unauthorized firmware even with physical access.
The Attack: FPGA Bitstream Manipulation
Kataria demonstrates that the TAm FPGA bitstream, stored in SPI flash, can be extracted and analyzed. By identifying and patching the specific bitstream logic that performs the cryptographic signature verification, the TAm can be made to approve any firmware image — defeating the hardware root of trust entirely.
Impact and Remediation
The attack affects all Cisco devices with TAm across multiple product lines (ISR, ASR, CSR, NCS series). Remediation requires physical hardware replacement as the vulnerability is in the FPGA bitstream provisioning process.
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