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Merge remote-tracking branch 'restricted/pr/668' into mbedtls-2.7-restricted

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* restricted/pr/668:
  Zeroize local AES variables before exiting the function
This commit is contained in:
Jaeden Amero 2019-11-12 10:42:45 +00:00
commit e70059df85
2 changed files with 32 additions and 0 deletions
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8
ChangeLog
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@ -8,6 +8,14 @@ Security
blinded value, factor it (as it is smaller than RSA keys and not guaranteed
to have only large prime factors), and then, by brute force, recover the
key. Reported by Alejandro Cabrera Aldaya and Billy Brumley.
* Zeroize local variables in mbedtls_internal_aes_encrypt() and
mbedtls_internal_aes_decrypt() before exiting the function. The value of
these variables can be used to recover the last round key. To follow best
practice and to limit the impact of buffer overread vulnerabilities (like
Heartbleed) we need to zeroize them before exiting the function.
Issue reported by Tuba Yavuz, Farhaan Fowze, Ken (Yihang) Bai,
Grant Hernandez, and Kevin Butler (University of Florida) and
Dave Tian (Purdue University).
Changes
* Add unit tests for AES-GCM when called through mbedtls_cipher_auth_xxx()

24
library/aes.c
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@ -761,6 +761,18 @@ int mbedtls_internal_aes_encrypt( mbedtls_aes_context *ctx,
PUT_UINT32_LE( X2, output, 8 );
PUT_UINT32_LE( X3, output, 12 );
mbedtls_zeroize( &X0, sizeof( X0 ) );
mbedtls_zeroize( &X1, sizeof( X1 ) );
mbedtls_zeroize( &X2, sizeof( X2 ) );
mbedtls_zeroize( &X3, sizeof( X3 ) );
mbedtls_zeroize( &Y0, sizeof( Y0 ) );
mbedtls_zeroize( &Y1, sizeof( Y1 ) );
mbedtls_zeroize( &Y2, sizeof( Y2 ) );
mbedtls_zeroize( &Y3, sizeof( Y3 ) );
mbedtls_zeroize( &RK, sizeof( RK ) );
return( 0 );
}
#endif /* !MBEDTLS_AES_ENCRYPT_ALT */
@ -829,6 +841,18 @@ int mbedtls_internal_aes_decrypt( mbedtls_aes_context *ctx,
PUT_UINT32_LE( X2, output, 8 );
PUT_UINT32_LE( X3, output, 12 );
mbedtls_zeroize( &X0, sizeof( X0 ) );
mbedtls_zeroize( &X1, sizeof( X1 ) );
mbedtls_zeroize( &X2, sizeof( X2 ) );
mbedtls_zeroize( &X3, sizeof( X3 ) );
mbedtls_zeroize( &Y0, sizeof( Y0 ) );
mbedtls_zeroize( &Y1, sizeof( Y1 ) );
mbedtls_zeroize( &Y2, sizeof( Y2 ) );
mbedtls_zeroize( &Y3, sizeof( Y3 ) );
mbedtls_zeroize( &RK, sizeof( RK ) );
return( 0 );
}
#endif /* !MBEDTLS_AES_DECRYPT_ALT */