Headline
CVE-2021-46659: [MDEV-25631] Crash executing query with VIEW, aggregate and subquery
MariaDB before 10.7.2 allows an application crash because it does not recognize that SELECT_LEX::nest_level is local to each VIEW.
I used my fuzzing tool to test Mariadb , and found a bug that can result in an abortion.
Mariadb installation:
- cd mariadb-10.5.9
- mkdir build; cd build
- cmake -DWITH_ASAN=ON -DWITH_ASAN_SCOPE=ON -DWITH_DEBUG=ON …/
- make -j8 && sudo make install
How to Repeat:
export ASAN_OPTIONS=detect_leaks=0
/usr/local/mysql/bin/mysqld_safe &
/usr/local/mysql/bin/mysql -uroot -p123456(your password)
MariaDB> drop database if exists test_db;
MariaDB> create database test_db;
MariaDB> source fuzz.sql;
I have simplified the content of fuzz.sql, and I hope fuzz.sql can help you reproduce the bug and fix it. In addition, I attach the abortion report (which has its stack trace).
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Red Hat Security Advisory 2022-6443-01 - MariaDB is a multi-user, multi-threaded SQL database server that is binary compatible with MySQL. Issues addressed include buffer overflow and use-after-free vulnerabilities.
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Red Hat Security Advisory 2022-6306-01 - MariaDB is a multi-user, multi-threaded SQL database server. For all practical purposes, MariaDB is binary-compatible with MySQL. Issues addressed include buffer overflow and use-after-free vulnerabilities.
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MariaDB CONNECT Storage Engine Heap-based Buffer Overflow Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of MariaDB. Authentication is required to exploit this vulnerability. The specific flaw exists within the processing of SQL queries. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the service account. Was ZDI-CAN-16190.