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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 52 |
1 files changed, 52 insertions, 0 deletions
@@ -1,5 +1,57 @@ mbed TLS ChangeLog (Sorted per branch, date) += mbed TLS 2.16.7 branch released 2020-07-01 + +Security + * Fix a side channel vulnerability in modular exponentiation that could + reveal an RSA private key used in a secure enclave. Noticed by Sangho Lee, + Ming-Wei Shih, Prasun Gera, Taesoo Kim and Hyesoon Kim (Georgia Institute + of Technology); and Marcus Peinado (Microsoft Research). Reported by Raoul + Strackx (Fortanix) in #3394. + * Fix side channel in mbedtls_ecp_check_pub_priv() and + mbedtls_pk_parse_key() / mbedtls_pk_parse_keyfile() (when loading a + private key that didn't include the uncompressed public key), as well as + mbedtls_ecp_mul() / mbedtls_ecp_mul_restartable() when called with a NULL + f_rng argument. An attacker with access to precise enough timing and + memory access information (typically an untrusted operating system + attacking a secure enclave) could fully recover the ECC private key. + Found and reported by Alejandro Cabrera Aldaya and Billy Brumley. + * Fix issue in Lucky 13 counter-measure that could make it ineffective when + hardware accelerators were used (using one of the MBEDTLS_SHAxxx_ALT + macros). This would cause the original Lucky 13 attack to be possible in + those configurations, allowing an active network attacker to recover + plaintext after repeated timing measurements under some conditions. + Reported and fix suggested by Luc Perneel in #3246. + +Bugfix + * Fix the Visual Studio Release x64 build configuration for mbedtls itself. + Completes a previous fix in Mbed TLS 2.16.3 that only fixed the build for + the example programs. Reported in #1430 and fix contributed by irwir. + * Fix undefined behavior in X.509 certificate parsing if the + pathLenConstraint basic constraint value is equal to INT_MAX. + The actual effect with almost every compiler is the intended + behavior, so this is unlikely to be exploitable anywhere. #3197 + * Include asn1.h in error.c. Fixes #3328 reported by David Hu. + * Fix potential memory leaks in ecp_randomize_jac() and ecp_randomize_mxz() + when PRNG function fails. Contributed by Jonas Lejeune in #3318. + * Add additional bounds checks in ssl_write_client_hello() preventing + output buffer overflow if the configuration declared a buffer that was + too small. + +Changes + * Unify the example programs termination to call mbedtls_exit() instead of + using a return command. This has been done to enable customization of the + behavior in bare metal environments. + * Abort the ClientHello writing function as soon as some extension doesn't + fit into the record buffer. Previously, such extensions were silently + dropped. As a consequence, the TLS handshake now fails when the output + buffer is not large enough to hold the ClientHello. + * The ECP module, enabled by `MBEDTLS_ECP_C`, now depends on + `MBEDTLS_CTR_DRBG_C`, `MBEDTLS_HMAC_DRBG_C`, `MBEDTLS_SHA512_C` or + `MBEDTLS_SHA256_C` for some side-channel coutermeasures. If side channels + are not a concern, this dependency can be avoided by enabling the new + option `MBEDTLS_ECP_NO_INTERNAL_RNG`. + = mbed TLS 2.16.6 branch released 2020-04-14 Security |