MCP Server Boundary Audit Report

Executive Summary

This report summarizes a boundary and security audit of MCP server implementations, focusing on access control, path validation, and tool support. The audit reveals critical gaps in several implementations, particularly around sibling directory access, symlink handling, and read tool support. These gaps can lead to data leaks and unauthorized access, undermining the security model of MCP.

Methodology

Tools Tested : naive_server.py, @modelcontextprotocol/server-filesystem, @adpharm/mcp-server-filesystem-ro, mcp-server-filesystem, mcp-server-filesystem, @agent-infra/mcp-server-filesystem, and others.
Checks Performed :
- B1 : Absolute path traversal (outside/secret.txt) → should be blocked.
- B2 : Parent directory traversal (allowed/../outside/secret.txt) → should be blocked.
- B3 : Sibling prefix directories (allowed-evil/secret.txt) → should be blocked.
- B4 : Symlink escape (allowed/escape.txt → external path) → should be blocked.
- B5: Read access within allowed directories → should pass.
- Read Tool Support : Verified presence of required read tools (e.g., read_file, list_directory).

Key Findings

Critical Leaks:
- Multiple servers (e.g., mcp-server-filesystem-ro, naive_server.py) failed to block access to outside/secret.txt and allowed/../outside/secret.txt (LEAK verdict).
- Some servers (e.g., mcp-server-filesystem-ro) had leaks (e.g., LEAK verdict for evil/secret.txt and allowed-evil/secret.txt), indicating they did not properly restrict access to sibling directories or symbolic links.
- The naive_server.py (a simple Python server) consistently failed to enforce boundary checks, allowing access to unauthorized files.
Tool Support Gaps:
- Servers like server-filesystem and server-memory lacked proper read tool support, making boundary checks incomplete.
- The official @modelcontextprotocol/server-filesystem passed all checks when properly configured, showing that the issue lies in implementation rather than the protocol itself.
Positive Outcomes:
- The server-filesystem (official) passed all checks when properly configured, demonstrating that the protocol is sound when implemented correctly.
- The audit provides concrete evidence of where implementations fail, enabling targeted improvements.

Recommendations

Enforce Strict Path Validation :
- Implement robust checks for .. traversal and sibling directory access.
- Ensure symlink targets are validated against allowed directories.
Mandate Read Tool Support :
- Require servers to expose explicit read tools (e.g., read_file, list_directory) to enable reliable boundary checks.
Provide Custom Audits :
- Offer a paid audit service to MCP server owners to verify their boundary implementations against this checklist.
- Provide a template report (like this one) for clients to use as a reference.

Service Offering

We offer a MCP Server Boundary Audit Service to help server owners:

Perform comprehensive security reviews of their implementations.
Identify and fix boundary enforcement gaps.
Ensure compliance with MCP security best practices.

Contact : $Your Contact Information$

Rate: ¥300--¥1,500 per audit (based on server complexity)

Report generated by tools/mcp_audit.py on 2026-10-06. Data sourced from data/mcp-audit-results.json. @TOC

欢迎使用Markdown编辑器

你好！这是你第一次使用 Markdown编辑器 所展示的欢迎页。如果你想学习如何使用Markdown编辑器, 可以仔细阅读这篇文章，了解一下Markdown的基本语法知识。

新的改变

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全新的界面设计 ，将会带来全新的写作体验；
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全新的 KaTeX数学公式 语法；
增加了支持甘特图的mermaid语法^{[1](#甘特图的mermaid语法1)} 功能；
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增加了 焦点写作模式、预览模式、简洁写作模式、左右区域同步滚轮设置 等功能，功能按钮位于编辑区域与预览区域中间；
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功能快捷键

撤销：Ctrl/Command + Z

重做：Ctrl/Command + Y

加粗：Ctrl/Command + B

斜体：Ctrl/Command + I

标题：Ctrl/Command + Shift + H

无序列表：Ctrl/Command + Shift + U

有序列表：Ctrl/Command + Shift + O

检查列表：Ctrl/Command + Shift + C

插入代码：Ctrl/Command + Shift + K

插入链接：Ctrl/Command + Shift + L

插入图片：Ctrl/Command + Shift + G

查找：Ctrl/Command + F

替换：Ctrl/Command + G

合理的创建标题，有助于目录的生成

直接输入1次#，并按下space后，将生成1级标题。

输入2次#，并按下space后，将生成2级标题。

以此类推，我们支持6级标题。有助于使用TOC语法后生成一个完美的目录。

如何改变文本的样式

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H₂O is是液体。

2¹⁰ 运算结果是 1024.

插入链接与图片

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图片:

带尺寸的图片:

居中的图片:

居中并且带尺寸的图片:

当然，我们为了让用户更加便捷，我们增加了图片拖拽功能。

如何插入一段漂亮的代码片

去博客设置页面，选择一款你喜欢的代码片高亮样式，下面展示同样高亮的 代码片.

javascript 复制代码

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项目1
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计划任务
完成任务

创建一个表格

一个简单的表格是这么创建的：

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设定内容居中、居左、居右

使用:---------:居中

使用:----------居左

使用----------:居右

第一列	第二列	第三列
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SmartyPants

SmartyPants 是一个文本转换工具，主要功能是将普通的 ASCII 标点符号自动转换为更美观的印刷体标点符号。例如：

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创建一个自定义列表

:
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如何创建一个注脚

一个具有注脚的文本。^[2](#2)

注释也是必不可少的

Markdown将文本转换为。

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您可以使用渲染LaTeX数学表达式 KaTeX:

Gamma公式展示 Γ ( n ) = ( n − 1 ) ! ∀ n ∈ N \Gamma(n) = (n-1)!\quad\forall n\in\mathbb N Γ(n)=(n−1)!∀n∈N 是通过欧拉积分

Γ ( z ) = ∫ 0 ∞ t z − 1 e − t d t . \Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,. Γ(z)=∫0∞tz−1e−tdt.

你可以找到更多关于的信息 LaTeX 数学表达式here.

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关于 甘特图 语法，参考这儿,

UML图表

可以使用UML图表进行渲染，例如下面产生的一个序列图：
王五李四张三王五李四张三 #mermaid-svg-OabrIuoLOMFWlnye{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-OabrIuoLOMFWlnye .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-OabrIuoLOMFWlnye .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-OabrIuoLOMFWlnye .error-icon{fill:#552222;}#mermaid-svg-OabrIuoLOMFWlnye .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-OabrIuoLOMFWlnye .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-OabrIuoLOMFWlnye .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-OabrIuoLOMFWlnye .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-OabrIuoLOMFWlnye .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-OabrIuoLOMFWlnye .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-OabrIuoLOMFWlnye .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-OabrIuoLOMFWlnye .marker{fill:#333333;stroke:#333333;}#mermaid-svg-OabrIuoLOMFWlnye .marker.cross{stroke:#333333;}#mermaid-svg-OabrIuoLOMFWlnye svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-OabrIuoLOMFWlnye p{margin:0;}#mermaid-svg-OabrIuoLOMFWlnye .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-OabrIuoLOMFWlnye text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-OabrIuoLOMFWlnye .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-OabrIuoLOMFWlnye .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-OabrIuoLOMFWlnye .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-OabrIuoLOMFWlnye .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-OabrIuoLOMFWlnye #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-OabrIuoLOMFWlnye .sequenceNumber{fill:white;}#mermaid-svg-OabrIuoLOMFWlnye #sequencenumber{fill:#333;}#mermaid-svg-OabrIuoLOMFWlnye #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-OabrIuoLOMFWlnye .messageText{fill:#333;stroke:none;}#mermaid-svg-OabrIuoLOMFWlnye .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-OabrIuoLOMFWlnye .labelText,#mermaid-svg-OabrIuoLOMFWlnye .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-OabrIuoLOMFWlnye .loopText,#mermaid-svg-OabrIuoLOMFWlnye .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-OabrIuoLOMFWlnye .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-OabrIuoLOMFWlnye .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-OabrIuoLOMFWlnye .noteText,#mermaid-svg-OabrIuoLOMFWlnye .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-OabrIuoLOMFWlnye .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-OabrIuoLOMFWlnye .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-OabrIuoLOMFWlnye .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-OabrIuoLOMFWlnye .actorPopupMenu{position:absolute;}#mermaid-svg-OabrIuoLOMFWlnye .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 / 0.4));}#mermaid-svg-OabrIuoLOMFWlnye .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-OabrIuoLOMFWlnye .actor-man circle,#mermaid-svg-OabrIuoLOMFWlnye line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-OabrIuoLOMFWlnye :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} 李四想了很长时间, 文字太长了不适合放在一行. 你好！李四, 最近怎么样? 你最近怎么样，王五？我很好，谢谢! 我很好，谢谢! 打量着王五... 很好... 王五, 你怎么样?

关于 UML图表 语法，参考这儿,

流程图

#mermaid-svg-KxHwhs1Tx4f96Wxx{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-KxHwhs1Tx4f96Wxx .error-icon{fill:#552222;}#mermaid-svg-KxHwhs1Tx4f96Wxx .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-KxHwhs1Tx4f96Wxx .marker{fill:#333333;stroke:#333333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .marker.cross{stroke:#333333;}#mermaid-svg-KxHwhs1Tx4f96Wxx svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-KxHwhs1Tx4f96Wxx p{margin:0;}#mermaid-svg-KxHwhs1Tx4f96Wxx .label{font-family:"trebuchet ms",verdana,arial,sans-serif;color:#333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .cluster-label text{fill:#333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .cluster-label span{color:#333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .cluster-label span p{background-color:transparent;}#mermaid-svg-KxHwhs1Tx4f96Wxx .label text,#mermaid-svg-KxHwhs1Tx4f96Wxx span{fill:#333;color:#333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .node rect,#mermaid-svg-KxHwhs1Tx4f96Wxx .node circle,#mermaid-svg-KxHwhs1Tx4f96Wxx .node ellipse,#mermaid-svg-KxHwhs1Tx4f96Wxx .node polygon,#mermaid-svg-KxHwhs1Tx4f96Wxx .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-KxHwhs1Tx4f96Wxx .rough-node .label text,#mermaid-svg-KxHwhs1Tx4f96Wxx .node .label text,#mermaid-svg-KxHwhs1Tx4f96Wxx .image-shape .label,#mermaid-svg-KxHwhs1Tx4f96Wxx .icon-shape .label{text-anchor:middle;}#mermaid-svg-KxHwhs1Tx4f96Wxx .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-KxHwhs1Tx4f96Wxx .rough-node .label,#mermaid-svg-KxHwhs1Tx4f96Wxx .node .label,#mermaid-svg-KxHwhs1Tx4f96Wxx .image-shape .label,#mermaid-svg-KxHwhs1Tx4f96Wxx .icon-shape .label{text-align:center;}#mermaid-svg-KxHwhs1Tx4f96Wxx .node.clickable{cursor:pointer;}#mermaid-svg-KxHwhs1Tx4f96Wxx .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .arrowheadPath{fill:#333333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-KxHwhs1Tx4f96Wxx .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-KxHwhs1Tx4f96Wxx .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-KxHwhs1Tx4f96Wxx .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-KxHwhs1Tx4f96Wxx .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-KxHwhs1Tx4f96Wxx .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-KxHwhs1Tx4f96Wxx .cluster text{fill:#333;}#mermaid-svg-KxHwhs1Tx4f96Wxx .cluster span{color:#333;}#mermaid-svg-KxHwhs1Tx4f96Wxx div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-KxHwhs1Tx4f96Wxx .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-KxHwhs1Tx4f96Wxx rect.text{fill:none;stroke-width:0;}#mermaid-svg-KxHwhs1Tx4f96Wxx .icon-shape,#mermaid-svg-KxHwhs1Tx4f96Wxx .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-KxHwhs1Tx4f96Wxx .icon-shape p,#mermaid-svg-KxHwhs1Tx4f96Wxx .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-KxHwhs1Tx4f96Wxx .icon-shape .label rect,#mermaid-svg-KxHwhs1Tx4f96Wxx .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-KxHwhs1Tx4f96Wxx .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-KxHwhs1Tx4f96Wxx .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-KxHwhs1Tx4f96Wxx :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} 链接
长方形
圆
圆角长方形
菱形

关于 Mermaid 语法，参考这儿,

FLowchart流程图

我们依旧会支持flowchart.js的流程图语法：
Created with Raphaël 2.3.0 开始我的操作确认？结束 yes no

关于 Flowchart流程图 语法，参考这儿.

导出与导入

导出

如果你想尝试使用此编辑器, 你可以在此篇文章任意编辑。当你完成了一篇文章的写作, 在上方工具栏找到 文章导出 ，生成一个.md文件或者.html文件进行本地保存。

导入

如果你想加载一篇你写过的.md文件，在上方工具栏可以选择导入功能进行对应扩展名的文件导入，

继续你的创作。

mermaid语法说明 ↩︎
注脚的解释 ↩︎

*[HTML]: 超文本标记语言