Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period. This issue is fixed in version 6.5.3.
oryginał ENCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HTornadoweb Tornado
APPTornadoweb< 6.5.3
Powiązane podatności
In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite argumen...
Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, ...
Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, a single m...
Tornado is a Python web framework and asynchronous networking library. When Tornado's ``multipart/form-data`` ...
Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP coo...