Private-key disclosure via base-blinding side channel
Published Jul 19, 2021 · Updated Aug 4, 2024
Information disclosure in Arm Mbed TLS before 2.24.0 allows local users to recover RSA or static Diffie-Hellman private keys. During base-blinding setup, the modular inverse routine calls a GCD implementation whose timing and memory-access pattern leaks the initial blinding values. Exploitation requires precise timing and memory-access observations, typically from an untrusted operating system against a secure enclave, and enables prediction of later blinding values for chosen-input key recovery.
Summary
What happened
Information disclosure in Arm Mbed TLS before 2.24.0 allows local users to recover RSA or static Diffie-Hellman private keys. During base-blinding setup, the modular inverse routine calls a GCD implementation whose timing and memory-access pattern leaks the initial blinding values. Exploitation requires precise timing and memory-access observations, typically from an untrusted operating system against a secure enclave, and enables prediction of later blinding values for chosen-input key recovery.
The record
- CVE
- CVE-2020-36424
- Published
- Jul 19, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-203
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 19, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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