![]() ![]() Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`. Werkzeug is a comprehensive WSGI web application library. Incorrect handling of '\0' bytes in file uploads in ModSecurity before 2.9.7 may allow for Web Application Firewall bypasses and buffer over-reads on the Web Application Firewall when executing rules that read the FILES_TMP_CONTENT collection. Version 2.2.3 contains a patch for this issue. If many concurrent requests are sent continuously, this can exhaust or kill all available workers. Unlimited file parts can use up memory and file handles. The amount of RAM required can trigger an out of memory kill of the process. The amount of CPU time required can block worker processes from handling legitimate requests. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. If a request can be made to an endpoint that accesses `request.data`, `request.form`, `request.files`, or `request.get_data(parse_form_data=False)`, it can cause unexpectedly high resource usage. Parts can be a small amount of bytes, but each requires CPU time to parse and may use more memory as Python data. Prior to version 2.2.3, Werkzeug's multipart form data parser will parse an unlimited number of parts, including file parts. ![]()
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