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    • Matt Caswell's avatar
      Fix buffer overrun in RSA signing · 34166d41
      Matt Caswell authored
      
      
      The problem occurs in EVP_PKEY_sign() when using RSA with X931 padding.
      It is only triggered if the RSA key size is smaller than the digest length.
      So with SHA512 you can trigger the overflow with anything less than an RSA
      512 bit key. I managed to trigger a 62 byte overflow when using a 16 bit RSA
      key. This wasn't sufficient to cause a crash, although your mileage may
      vary.
      
      In practice RSA keys of this length are never used and X931 padding is very
      rare. Even if someone did use an excessively short RSA key, the chances of
      them combining that with a longer digest and X931 padding is very
      small. For these reasons I do not believe there is a security implication to
      this. Thanks to Kevin Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3
      Solutions) for reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      34166d41
    • Matt Caswell's avatar
      Add sanity check to print_bin function · 3deeeeb6
      Matt Caswell authored
      
      
      Add a sanity check to the print_bin function to ensure that the |off|
      argument is positive. Thanks to Kevin Wojtysiak (Int3 Solutions) and
      Paramjot Oberoi (Int3 Solutions) for reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      3deeeeb6
    • Matt Caswell's avatar
      Add sanity check to ssl_get_prev_session · cb0f400b
      Matt Caswell authored
      
      
      Sanity check the |len| parameter to ensure it is positive. Thanks to Kevin
      Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3 Solutions) for
      reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      cb0f400b
    • Matt Caswell's avatar
      Sanity check the return from final_finish_mac · c427570e
      Matt Caswell authored
      
      
      The return value is checked for 0. This is currently safe but we should
      really check for <= 0 since -1 is frequently used for error conditions.
      Thanks to Kevin Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3
      Solutions) for reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      c427570e
    • Matt Caswell's avatar
      Add sanity check in ssl3_cbc_digest_record · 29b0a15a
      Matt Caswell authored
      
      
      For SSLv3 the code assumes that |header_length| > |md_block_size|. Whilst
      this is true for all SSLv3 ciphersuites, this fact is far from obvious by
      looking at the code. If this were not the case then an integer overflow
      would occur, leading to a subsequent buffer overflow. Therefore I have
      added an explicit sanity check to ensure header_length is always valid.
      Thanks to Kevin Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3
      Solutions) for reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      29b0a15a
    • Matt Caswell's avatar
      Clarify logic in BIO_*printf functions · 9d9e3774
      Matt Caswell authored
      
      
      The static function dynamically allocates an output buffer if the output
      grows larger than the static buffer that is normally used. The original
      logic implied that |currlen| could be greater than |maxlen| which is
      incorrect (and if so would cause a buffer overrun). Also the original
      logic would call OPENSSL_malloc to create a dynamic buffer equal to the
      size of the static buffer, and then immediately call OPENSSL_realloc to
      make it bigger, rather than just creating a buffer than was big enough in
      the first place. Thanks to Kevin Wojtysiak (Int3 Solutions) and Paramjot
      Oberoi (Int3 Solutions) for reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      9d9e3774
    • Matt Caswell's avatar
      Sanity check EVP_EncodeUpdate buffer len · b86d7dca
      Matt Caswell authored
      
      
      There was already a sanity check to ensure the passed buffer length is not
      zero. Extend this to ensure that it also not negative. Thanks to Kevin
      Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3 Solutions) for
      reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      b86d7dca
    • Matt Caswell's avatar
      Sanity check EVP_CTRL_AEAD_TLS_AAD · c8269881
      Matt Caswell authored
      
      
      The various implementations of EVP_CTRL_AEAD_TLS_AAD expect a buffer of at
      least 13 bytes long. Add sanity checks to ensure that the length is at
      least that. Also add a new constant (EVP_AEAD_TLS1_AAD_LEN) to evp.h to
      represent this length. Thanks to Kevin Wojtysiak (Int3 Solutions) and
      Paramjot Oberoi (Int3 Solutions) for reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      c8269881
    • Matt Caswell's avatar
      Sanity check DES_enc_write buffer length · 873fb39f
      Matt Caswell authored
      
      
      Add a sanity check to DES_enc_write to ensure the buffer length provided
      is not negative. Thanks to Kevin Wojtysiak (Int3 Solutions) and Paramjot
      Oberoi (Int3 Solutions) for reporting this issue.
      
      Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
      873fb39f