Vulnerability Report

CVE-2016-6663

Title: Percona Xtradb Cluster Auth Bypass

Auth Bypass

Proof Of Concept

PoC Available for CVE-2016-6663

CWE Category CWE-362
Published Date Dec 13, 2016
Modified Date May 06, 2026
Exploit Status Available
Score 7.0 CVSS v3.0
Exploit Probability (EPSS)
2.61%

Vulnerability Summary

CVE-2016-6663: Race condition in Oracle MySQL before 5.5.52, 5.6.x before 5.6.33, 5.7.x before 5.7.15, and 8.x before 8.0.1; MariaDB before 5.5.52, 10.0.x before 10.0.28, and 10.1.x before 10.1.18; Percona Server before 5.5.51-38.2, 5.6.x before 5.6.32-78-1, and 5.7.x before 5.7.14-8; and Percona XtraDB Cluster before 5.5.41-37.0, 5.6.x before 5.6.32-25.17, and 5.7.x before 5.7.14-26.17 allows local users with certain permissions to gain privileges by leveraging use of my_copystat by REPAIR TABLE to repair a MyISAM table.

Impacted Vendors

P
percona 2
M
mysqljs 1
O
oracle 1
M
mysql 1
M
mariadb 1

Reference Links

http://rhn.redhat.com/errata/RHSA-2016-2130.html http://rhn.redhat.com/errata/RHSA-2016-2131.html http://rhn.redhat.com/errata/RHSA-2016-2595.html http://rhn.redhat.com/errata/RHSA-2016-2749.html http://rhn.redhat.com/errata/RHSA-2016-2927.html http://rhn.redhat.com/errata/RHSA-2016-2928.html http://rhn.redhat.com/errata/RHSA-2017-0184.html http://seclists.org/fulldisclosure/2016/Nov/4 http://www.openwall.com/lists/oss-security/2016/10/25/4 http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html http://www.securityfocus.com/bid/92911 http://www.securityfocus.com/bid/93614 https://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-52.html https://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-33.html https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-15.html https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html https://github.com/MariaDB/server/commit/347eeefbfc658c8531878218487d729f4e020805 https://github.com/mysql/mysql-server/commit/4e5473862e6852b0f3802b0cd0c6fa10b5253291 https://legalhackers.com/advisories/MySQL-Maria-Percona-PrivEscRace-CVE-2016-6663-5616-Exploit.html https://mariadb.com/kb/en/mariadb/mariadb-10028-release-notes/ https://mariadb.com/kb/en/mariadb/mariadb-10118-release-notes/ https://mariadb.com/kb/en/mariadb/mariadb-5552-release-notes/ https://www.exploit-db.com/exploits/40678/ https://www.percona.com/blog/2016/11/02/percona-responds-to-cve-2016-6663-and-cve-2016-6664/ http://rhn.redhat.com/errata/RHSA-2016-2130.html http://rhn.redhat.com/errata/RHSA-2016-2131.html http://rhn.redhat.com/errata/RHSA-2016-2595.html http://rhn.redhat.com/errata/RHSA-2016-2749.html http://rhn.redhat.com/errata/RHSA-2016-2927.html http://rhn.redhat.com/errata/RHSA-2016-2928.html http://rhn.redhat.com/errata/RHSA-2017-0184.html http://seclists.org/fulldisclosure/2016/Nov/4 http://www.openwall.com/lists/oss-security/2016/10/25/4 http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html http://www.securityfocus.com/bid/92911 http://www.securityfocus.com/bid/93614 https://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-52.html https://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-33.html https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-15.html https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html https://github.com/MariaDB/server/commit/347eeefbfc658c8531878218487d729f4e020805 https://github.com/mysql/mysql-server/commit/4e5473862e6852b0f3802b0cd0c6fa10b5253291 https://legalhackers.com/advisories/MySQL-Maria-Percona-PrivEscRace-CVE-2016-6663-5616-Exploit.html https://mariadb.com/kb/en/mariadb/mariadb-10028-release-notes/ https://mariadb.com/kb/en/mariadb/mariadb-10118-release-notes/ https://mariadb.com/kb/en/mariadb/mariadb-5552-release-notes/ https://www.exploit-db.com/exploits/40678/ https://www.percona.com/blog/2016/11/02/percona-responds-to-cve-2016-6663-and-cve-2016-6664/
CVSS v3.0
Source Entity [email protected]
Severity HIGH
7.0
Attack Vector
LOCAL
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.4
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:L/AC:M/Au:N/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2016-6663 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/40678
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.