Headline
CVE-2021-46669: [MDEV-25638] Assertion `!result' failed in convert_const_to_int
MariaDB through 10.5.9 allows attackers to trigger a convert_const_to_int use-after-free when the BIGINT data type is used.
I used my fuzzing tool to test Mariadb , and found a bug that can result in an heap-use-after-free (reported by ASAN).
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 ASAN report.
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