HTTP Response Splitting Affecting io.ratpack:ratpack-core package, versions (0.9.1,1.7.5)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-IORATPACK-473841
- published18 Oct 2019
- disclosed17 Oct 2019
- creditJonathan Leitschuh
Introduced: 17 Oct 2019
CVE-2019-17513 (opens in a new tab)How to fix?
Upgrade io.ratpack:ratpack-core to version 1.7.5 or higher.
Overview
io.ratpack:ratpack-core is a simple, capable, toolkit for creating high performance web applications.
Affected versions of this package are vulnerable to HTTP Response Splitting. If untrusted and unsanitized data is used to populate the headers of an HTTP response, an attacker can utilize this vulnerability to have the server issue any HTTP response they specify. The root cause was due to using the netty DefaultHttpHeaders object with verification disabled.
If your application uses arbitrary user input as the value of a response header it is vulnerable. If your application does not use arbitrary values as response header values, it is not vulnerable.
PoC by Jonathan Leitschuh
RatpackServer startedServer = RatpackServer.start(server -> {
server.handlers(chain -> chain.all(ctx -> {
// User supplied query parameter
String header = ctx.getRequest().getQueryParams().get("header");
// User supplied data used to populate a header value.
ctx.header("the-header", header)
.render("OK!");
}));
});