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CVE-2022-42889 PoC
This is Proof of Concept for the vulnerability CVE-2022-42889. This code will run the JavaScript code 195 + 324
. If vulnerable the output should be:
Output: 519
In order to run this you will need:
- JDK 11 or above
- Maven
What's the Issue?
The issue stems from the fact that the following keys should not be interpolated by default (as per the documentation https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/lookup/StringLookupFactory.html):
script
dns
url
However due to a flaw in the logic, these 3 keys are interpolated by default, when they should not (since they could represent a security risk).
What's the Risk?
An attacker with control over the string passed into an affected StringSubstitutor
replace could allow the attacker to:
- Run JavaScript code on the system (typically a server) executing the
StringSubstitutor
code - Connect to other servers from the affected system
- Potentially gain access to other remove resources from the affected system
Am I Vulnerable?
In order for your code to be vulnerable you need to:
- Be running a version of Apache
commons-text
from version1.5.0
up to (and not including)1.10.0
- Using Interpolation for your StringSubstituion (see https://commons.apache.org/proper/commons-text/apidocs/org/apache/commons/text/StringSubstitutor.html)
Official Fix
The fix for this is to update your instances of commons-text
to versions 1.10.0
or later.
Note
The other default lookups could still potentially represent a security risk (such as the ability to read content of files, read system properies, etc). Use this feature with caution and make sure that all user input appropriately sanitised (for example passing through an allow list).