It was discovered that the MySQL logging functionality allowed writing to MySQL configuration files. An administrative database user, or a database user with FILE privileges, could possibly use this flaw to run arbitrary commands with root privileges on the system running the database server.
Find out more about CVE-2016-6662 from the MITRE CVE dictionary dictionary and NIST NVD.
All MySQL and MariaDB packages in Red Hat Enterprise Linux and Red Hat Software Collections install the my.cnf configuration file in /etc as root-owned and not writeable to mysqld's mysql user. This default configuration stops the published exploit for this issue.
All MySQL and MariaDB packages for Red Hat Enterprise Linux 7 (either those directly included in Red Hat Enterprise Linux 7 or from Red Hat Software Collections for Red Hat Enterprise Linux 7) run mysqld_safe with mysql user privileges and not root privileges, limiting the potential impact to code execution as mysql system user.
The MySQL 5.1 packages in Red Hat Enterprise Linux 6 do not implement support for library preloading, completely preventing the remote attack vector used by the published exploit.
For additional details, refer to:
| Base Score | 7.1 |
|---|---|
| Base Metrics | AV:N/AC:H/Au:S/C:C/I:C/A:C |
| Access Vector | Network |
| Access Complexity | High |
| Authentication | Single |
| Confidentiality Impact | Complete |
| Integrity Impact | Complete |
| Availability Impact | Complete |
| CVSS3 Base Score | 8 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | High |
| User Interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (mariadb55-mariadb) | RHSA-2016:2131 | 2016-10-31 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (rh-mariadb101-mariadb) | RHSA-2016:2928 | 2016-12-08 |
| Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7 (mariadb-galera) | RHSA-2016:2059 | 2016-10-13 |
| Red Hat Enterprise Linux 6 (mysql) | RHSA-2017:0184 | 2017-01-24 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (rh-mysql56-mysql) | RHSA-2016:2749 | 2016-11-15 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (rh-mariadb101-mariadb) | RHSA-2016:2928 | 2016-12-08 |
| Red Hat Enterprise Linux 7 (mariadb) | RHSA-2016:2595 | 2016-11-03 |
| Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 6 (mariadb-galera) | RHSA-2016:2058 | 2016-10-13 |
| Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 (mariadb-galera) | RHSA-2016:2060 | 2016-10-13 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (rh-mysql56-mysql) | RHSA-2016:2749 | 2016-11-15 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (mariadb55-mariadb) | RHSA-2016:2131 | 2016-10-31 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (mysql55-mysql) | RHSA-2016:2130 | 2016-10-31 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (mysql55-mysql) | RHSA-2016:2130 | 2016-10-31 |
| Red Hat OpenStack Platform 8.0 (Liberty) (mariadb-galera) | RHSA-2016:2077 | 2016-10-18 |
| Red Hat OpenStack Platform 9.0 (mariadb-galera) | RHSA-2016:2062 | 2016-10-13 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 (rh-mariadb100-mariadb) | RHSA-2016:2927 | 2016-12-08 |
| Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 (mariadb-galera) | RHSA-2016:2061 | 2016-10-13 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 (rh-mariadb100-mariadb) | RHSA-2016:2927 | 2016-12-08 |
| Platform | Package | State |
|---|---|---|
| Red Hat OpenStack Platform 10 | mariadb-galera | Not affected |
| Red Hat Mobile Application Platform On-Premise 4 | millicore | Not affected |
| Red Hat Enterprise Linux 5 | mysql | Not affected |
| Red Hat Enterprise Linux 5 | mysql55-mysql | Will not fix |
- Ensure all MySQL / MariaDB configuration files are not writeable to the mysql user. This is the default configuration in Red Hat products.
- Ensure that non-administrative database users are not granted FILE privilege. Applications accessing data in MySQL / MariaDB databases, including web application potentially vulnerable to SQL injections, should use database accounts with the lowest privileges required.
- If FILE permission needs to be granted to some non-administrative database users, use secure_file_priv setting to limit where files can be written to or read from.
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