漏洞信息
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Vulnerability Title
Quadratic CPU blow-up reassembling fragmented WebSocket messages in Bandit
Vulnerability Description
Inefficient Algorithmic Complexity vulnerability in mtrudel bandit allows unauthenticated remote denial of service via CPU exhaustion during WebSocket fragment reassembly.
The size guard 'Elixir.Bandit.WebSocket.Connection':oversize_message?/2 called from handle_frame/3 in lib/bandit/websocket/connection.ex appends each non-final continuation frame to a left-nested iolist and then re-measures the entire accumulated buffer with IO.iodata_length/1 on every frame. Because the buffer grows by one element per frame and is fully re-traversed each time, reassembly work is quadratic (O(n^2)) in the number of continuation frames.
The max_fragmented_message_size limit (default 8 MB) bounds total bytes but not frame count, and each frame can carry as little as one payload byte, so an attacker can send millions of tiny continuation frames using modest bandwidth to pin a CPU core for minutes to hours. Many concurrent connections can starve the whole server of CPU, denying service to legitimate users. The WebSocket read timeout does not help, because it is an idle timeout evaluated between reads and cannot preempt the synchronous reassembly work spent inside a single callback.
This issue affects bandit: from 1.11.0 before 1.12.1.
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Type
算法复杂性
Vulnerability Title
mtrudel bandit 资源管理错误漏洞
Vulnerability Description
mtrudel bandit是mtrudel的安全检查工具。 mtrudel bandit 1.11.0版本至1.12.1之前版本存在资源管理错误漏洞,该漏洞源于WebSocket分片重组时的算法复杂性效率低下,可能导致未经身份验证的攻击者通过发送大量微小延续帧耗尽CPU,造成拒绝服务。
CVSS Information
N/A
Vulnerability Type
N/A