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Taint gson sources (deserialization) v1.4 and v1.5 #6084

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jandro996
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@jandro996 jandro996 commented Oct 23, 2023

What Does This Do
Add instrumentation to com.google.gson.JsonParserJavacc

Motivation
Add gson source propagation for v1.4 and v1.5

Additional Notes
related with #6056

This PR is not completed, for ReInit method instrumentation we need to check if the input is tainted and if check if the JsonParserJavacc instance is tainted and remove it from the tainted objects.
Right now there is no mechanism to allow the removal of tainted objects (This will impact performance)

Jira ticket: APPSEC-11795

jandro996 and others added 27 commits October 11, 2023 13:59
Redacts values based on a list of predefined words
name are normalized in lower case and by removing special characters:
`@`, `$`, `-` and `_`
Redaction happening at:
 - expression language for reference, index and getmember operations
 - serialization for snapshot or template values including maps
 - capture of the values from instrumentation
For conditions (log or span decoration probes) evaluation of a
redacted values triggers an evaluation exception that will be reported
as evaluation error into a snapshot.
@jandro996 jandro996 closed this Oct 23, 2023
@jandro996
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This PR will be resumed one we are able to remove elements from tainted objects

}

@Override
public void adviceTransformations(AdviceTransformation transformation) {
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Needs to add more advices:
(InputStream, String)
ReInit(InputStream)
ReInit(StringReader)

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2 participants