mirror of
https://github.com/github/codeql.git
synced 2025-12-17 17:23:36 +01:00
53 lines
1.6 KiB
Plaintext
53 lines
1.6 KiB
Plaintext
/**
|
|
* @name Decoding after sanitization (generalized)
|
|
* @description Tracks the return value of an HTML sanitizer into an escape-sequence decoder,
|
|
* indicating an ineffective sanitization attempt.
|
|
* @kind path-problem
|
|
* @problem.severity error
|
|
* @tags security
|
|
* @id js/examples/decoding-after-sanitization-generalized
|
|
*/
|
|
|
|
import javascript
|
|
import DataFlow
|
|
import DataFlow::PathGraph
|
|
|
|
/**
|
|
* A call to a function that may introduce HTML meta-characters by
|
|
* replacing `%3C` or `\u003C` with `<`.
|
|
*/
|
|
class DecodingCall extends CallNode {
|
|
string kind;
|
|
Node input;
|
|
|
|
DecodingCall() {
|
|
getCalleeName().matches("decodeURI%") and
|
|
input = getArgument(0) and
|
|
kind = "URI decoding"
|
|
or
|
|
input = this.(JsonParserCall).getInput() and
|
|
kind = "JSON parsing"
|
|
}
|
|
|
|
/** Gets the decoder kind, to be used in the alert message. */
|
|
string getKind() { result = kind }
|
|
|
|
/** Gets the input being decoded. */
|
|
Node getInput() { result = input }
|
|
}
|
|
|
|
class DecodingAfterSanitization extends TaintTracking::Configuration {
|
|
DecodingAfterSanitization() { this = "DecodingAfterSanitization" }
|
|
|
|
override predicate isSource(Node node) { node instanceof HtmlSanitizerCall }
|
|
|
|
override predicate isSink(Node node) { node = any(DecodingCall c).getInput() }
|
|
}
|
|
|
|
from DecodingAfterSanitization cfg, PathNode source, PathNode sink, DecodingCall decoder
|
|
where
|
|
cfg.hasFlowPath(source, sink) and
|
|
decoder.getInput() = sink.getNode()
|
|
select sink.getNode(), source, sink,
|
|
decoder.getKind() + " invalidates the HTML sanitization performed $@.", source.getNode(), "here"
|