rok Python ProxyShare can be used as an SSRF proxy through absolute URL paths
Summary
Alice exposes a Python SDK ProxyShare with a fixed target URL. Bob sends a request to the share with an absolute URL in the path. The Flask handler passes that path to urllib.parse.urljoin, which replaces Alice's configured target host with Bob's host and returns the server-side response to Bob.
Details
The Python SDK proxy route accepts every path under the share:
@app.route('/', defaults={'path': ''}, methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'])
@app.route('/', methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'])
def proxy(path):It constructs the outbound URL with urljoin and then sends the request:
url = urllib.parse.urljoin(self.target, path)
resp = requests.request(
method=request.method,
url=url,
headers={key: value for (key, value) in request.headers
if key.lower() not in HOP_BY_HOP_HEADERS},
data=request.get_data(),
cookies=request.cookies,
allow_redirects=False,
stream=True,
verify=self.verify_ssl
)When path is http://127.0.0.1:19190/metadata, urljoin(self.target, path) returns http://127.0.0.1:19190/metadata. The proxy sends the request to Bob's chosen URL rather than Alice's target.