MariaDB: Use-after-free with a large number of SYS_REFCURSOR's

Summary

MariaDB server is a community developed fork of MySQL server. From 12.3.1 until 12.3.3 and 13.0.2, SYS_REFCURSOR handling is affected because cursor-array reallocation can leave stale references in routine contexts. A low-privileged attacker can open a large number of SYS_REFCURSORs and then fetch one to trigger a use-after-free that can enable remote code execution when combined with another vulnerability. This issue is fixed in versions 12.3.3 and 13.0.2.

Affected versions

• MariaDB server

  From 12.3.1 · fixed in 12.3.3; From 13.0.1 · fixed in 13.0.2

• mariadbBitnami

  From 12.3.1 · fixed in 12.3.3; From 13.0.0 · fixed in 13.0.2

• mariadb-minBitnami

  From 12.3.1 · fixed in 12.3.3; From 13.0.0 · fixed in 13.0.2

• mysql-clientBitnami

  From 12.3.1 · fixed in 12.3.3; From 13.0.0 · fixed in 13.0.2

References 7