CVE-2016-6606

An issue was discovered in cookie encryption in phpMyAdmin. The decryption
of the username/password is vulnerable to a padding oracle attack. This can
allow an attacker who has access to a user’s browser cookie file to decrypt
the username and password. Furthermore, the same initialization vector (IV)
is used to hash the username and password stored in the phpMyAdmin cookie.
If a user has the same password as their username, an attacker who examines
the browser cookie can see that they are the same - but the attacker can
not directly decode these values from the cookie as it is still hashed. All
4.6.x versions (prior to 4.6.4), 4.4.x versions (prior to 4.4.15.8), and
4.0.x versions (prior to 4.0.10.17) are affected.