15 lines
885 B
Text
15 lines
885 B
Text
Changes
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* The ECP module, enabled by `MBEDTLS_ECP_C`, now depends on
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`MBEDTLS_CTR_DRBG_C` or `MBEDTLS_HMAC_DRBG_C` for some side-channel
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coutermeasures. If side channels are not a concern, this dependency can
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be avoided by enabling the new option `MBEDTLS_ECP_NO_INTERNAL_RNG`.
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Security
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* Fix side channel in mbedtls_ecp_check_pub_priv() and
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mbedtls_pk_parse_key() / mbedtls_pk_parse_keyfile() (when loading a
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private key that didn't include the uncompressed public key), as well as
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mbedtls_ecp_mul() / mbedtls_ecp_mul_restartable() when called with a NULL
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f_rng argument. An attacker with access to precise enough timing and
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memory access information (typically an untrusted operating system
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attacking a secure enclave) could fully recover the ECC private key.
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Found and reported by Alejandro Cabrera Aldaya and Billy Brumley.
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