SSL_Cipher.cpp in EncFS before 1.7.0 uses an improper combination of an AES cipher and a CBC cipher mode for encrypted filesystems, which allows local users to obtain sensitive information via a watermark attack.
Weaknesses in this category are related to the design and implementation of data confidentiality and integrity. Frequently these deal with the use of encoding techniques, encryption libraries, and hashing algorithms. The weaknesses in this category could lead to a degradation of the quality data if they are not addressed.