Padding size with a CBC Block cipher in TLS
In RFC2246, if you need 12 bytes of padding total, that means that you have 11 padding bytes, followed by a padding length field.  So, each padding byte has a value of 11 (0x0b), as well as the padding length field.  This is implied by the requirement that the total TLSCiphertext.length must be a multiple of the block size, and this TLSCiphertext.length includes the padding length field itself.