Weakness with cookie encryption

PMASA-2016-29

Announcement-ID: PMASA-2016-29

Date: 2016-07-07

Summary

Weakness with cookie encryption

Description

A pair of vulnerabilities were found affecting the way cookies are stored.

• The decryption of the username/password is vulnerable to a padding oracle attack. The can allow an attacker who has access to a user’s browser cookie file to decrypt the username and password.
• A vulnerability was found where 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.

Severity

We consider this to be critical.

Affected Versions

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

Solution

Upgrade to phpMyAdmin 4.6.4, 4.4.15.8, 4.0.10.17, or newer or apply patch listed below.

References

Thanks to Emanuel Bronshtein @e3amn2l for reporting this vulnerability.

Assigned CVE ids: CVE-2016-6606

CWE ids: CWE-661

Patches

The following commits have been made on the 4.6 branch to fix this issue:

• a97be3a

The following commits have been made on the 4.4 branch to fix this issue:

• cd682a6

The following commits have been made on the 4.0 branch to fix this issue:

• 95b7b7d

More information

For further information and in case of questions, please contact the phpMyAdmin team. Our website is phpmyadmin.net.