Vulnerability Information
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Vulnerability Title
Tornado is Vulnerable to Quadratic DoS via Repeated Header Coalescing
Vulnerability Description
Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, a single maliciously crafted HTTP request can block the server's event loop for an extended period, caused by the HTTPHeaders.add method. The function accumulates values using string concatenation when the same header name is repeated, causing a Denial of Service (DoS). Due to Python string immutability, each concatenation copies the entire string, resulting in O(n²) time complexity. The severity can vary from high if max_header_size has been increased from its default, to low if it has its default value of 64KB. This issue is fixed in version 6.5.3.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Vulnerability Title
Tornado 资源管理错误漏洞
Vulnerability Description
Tornado是中国龙卷风科技（Tornado）社区的一个Python Web框架和异步网络库。该库通过使用非阻塞网络I / O，可以扩展到成千上万的开放连接，使其非常适合 长时间轮询， WebSocket和其他需要与每个用户建立长期连接的应用程序。 Tornado 6.5.2及之前版本存在资源管理错误漏洞，该漏洞源于HTTPHeaders.add方法存在字符串连接问题，可能导致拒绝服务攻击。
CVSS Information
N/A
Vulnerability Type
N/A