FreeBSD: VID-2ad25820-c71a-4e6c-bb99-770c66fe496d: py-Scrapy -- credentials leak vulnerability

When the built-in HTTP proxy downloader middleware processes a request with `proxy` metadata, and that `proxy` metadata includes proxy credentials, the built-in HTTP proxy downloader middleware sets the `Proxy-Authentication` header, but only if that header is not already set. There are third-party proxy-rotation downloader middlewares that set different `proxy` metadata every time they process a request. Because of request retries and redirects, the same request can be processed by downloader middlewares more than once, including both the built-in HTTP proxy downloader middleware and any third-party proxy-rotation downloader middleware. These third-party proxy-rotation downloader middlewares could change the `proxy` metadata of a request to a new value, but fail to remove the `Proxy-Authentication` header from the previous value of the `proxy` metadata, causing the credentials of one proxy to be leaked to a different proxy. If you rotate proxies from different proxy providers, and any of those proxies requires credentials, you are affected, unless you are handling proxy rotation as described under **Workarounds** below. If you use a third-party downloader middleware for proxy rotation, the same applies to that downloader middleware, and installing a patched version of Scrapy may not be enough; patching that downloader middlware may be necessary as well.