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Mbed TLS 2.28.2
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@daverodgman daverodgman released this 14 Dec 19:27
· 1620 commits to mbedtls-2.28 since this release
v2.28.2
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Description

This release of Mbed TLS provides bug fixes and minor enhancements. This release includes fixes for security issues.

Mbed TLS 2.28 is a long-time support branch. It will be supported with bug-fixes and security fixes until end of 2024.

Security Advisories

There are no security advisories for this release.

Release Notes

Security

  • Fix potential heap buffer overread and overwrite in DTLS if
    MBEDTLS_SSL_DTLS_CONNECTION_ID is enabled and
    MBEDTLS_SSL_CID_IN_LEN_MAX > 2 * MBEDTLS_SSL_CID_OUT_LEN_MAX.
  • An adversary with access to precise enough information about memory
    accesses (typically, an untrusted operating system attacking a secure
    enclave) could recover an RSA private key after observing the victim
    performing a single private-key operation if the window size used for the
    exponentiation was 3 or smaller. Found and reported by Zili KOU,
    Wenjian HE, Sharad Sinha, and Wei ZHANG. See "Cache Side-channel Attacks
    and Defenses of the Sliding Window Algorithm in TEEs" - Design, Automation
    and Test in Europe 2023.

Bugfix

  • Fix a long-standing build failure when building x86 PIC code with old
    gcc (4.x). The code will be slower, but will compile. We do however
    recommend upgrading to a more recent compiler instead. Fixes #1910.
  • Fix support for little-endian Microblaze when MBEDTLS_HAVE_ASM is defined.
    Contributed by Kazuyuki Kimura to fix #2020.
  • Use double quotes to include private header file psa_crypto_cipher.h.
    Fixes 'file not found with include' error
    when building with Xcode.
  • Fix handling of broken symlinks when loading certificates using
    mbedtls_x509_crt_parse_path(). Instead of returning an error as soon as a
    broken link is encountered, skip the broken link and continue parsing
    other certificate files. Contributed by Eduardo Silva in #2602.
  • Fix a compilation error when using CMake with an IAR toolchain.
    Fixes #5964.
  • Fix bugs and missing dependencies when building and testing
    configurations with only one encryption type enabled in TLS 1.2.
  • Provide the missing definition of mbedtls_setbuf() in some configurations
    with MBEDTLS_PLATFORM_C disabled. Fixes #6118, #6196.
  • Fix compilation errors when trying to build with
    PSA drivers for AEAD (GCM, CCM, Chacha20-Poly1305).
  • Fix memory leak in ssl_parse_certificate_request() caused by
    mbedtls_x509_get_name() not freeing allocated objects in case of error.
    Change mbedtls_x509_get_name() to clean up allocated objects on error.
  • Fix checks on PK in check_config.h for builds with PSA and RSA. This does
    not change which builds actually work, only moving a link-time error to
    an early check.
  • Fix ECDSA verification, where it was not always validating the
    public key. This bug meant that it was possible to verify a
    signature with an invalid public key, in some cases. Reported by
    Guido Vranken using Cryptofuzz in #4420.
  • Fix a possible null pointer dereference if a memory allocation fails
    in TLS PRF code. Reported by Michael Madsen in #6516.
  • Fix a bug in which mbedtls_x509_crt_info() would produce non-printable
    bytes when parsing certificates containing a binary RFC 4108
    HardwareModuleName as a Subject Alternative Name extension. Hardware
    serial numbers are now rendered in hex format. Fixes #6262.
  • Fix bug in error reporting in dh_genprime.c where upon failure,
    the error code returned by mbedtls_mpi_write_file() is overwritten
    and therefore not printed.
  • In the bignum module, operations of the form (-A) - (+A) or (-A) - (-A)
    with A > 0 created an unintended representation of the value 0 which was
    not processed correctly by some bignum operations. Fix this. This had no
    consequence on cryptography code, but might affect applications that call
    bignum directly and use negative numbers.
  • Fix undefined behavior (typically harmless in practice) of
    mbedtls_mpi_add_mpi(), mbedtls_mpi_add_abs() and mbedtls_mpi_add_int()
    when both operands are 0 and the left operand is represented with 0 limbs.
  • Fix undefined behavior (typically harmless in practice) when some bignum
    functions receive the most negative value of mbedtls_mpi_sint. Credit
    to OSS-Fuzz. Fixes #6597.
  • Fix undefined behavior (typically harmless in practice) in PSA ECB
    encryption and decryption.

Who should update

We recommend all users should update to take advantage of the bug fixes contained in this release at an appropriate point in their development lifecycle.

Checksum

The SHA256 hashes for the archives are:

bc55232bf71fd66045122ba9050a29ea7cb2e8f99b064a9e6334a82f715881a0 mbedtls-2.28.2.tar.gz
4e4c4d5fd062dc29160edb916fb969878682221a142bda2be5db40e60125912c mbedtls-2.28.2.zip

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