Content Injection Affecting Crow package, versions [,0.3+4)
Threat Intelligence
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-UNMANAGED-CROW-2336164
- published12 Jan 2022
- disclosed12 Jan 2022
- creditSnyk Security Team
Introduced: 12 Jan 2022
CVE-2021-23824 (opens in a new tab)How to fix?
Upgrade Crow to version 0.3+4 or higher.
Overview
Crow is a C++ microframework for running web services.
Affected versions of this package are vulnerable to Content Injection. When using attributes without quotes in the template, an attacker can manipulate the input to introduce additional attributes, potentially executing code. This may lead to a Cross-site Scripting (XSS) vulnerability, assuming an attacker can influence the value entered into the template. If the template is used to render user-generated content, this vulnerability may escalate to a persistent XSS vulnerability.
PoC
templates/test.html file:
<html><body><img src={{src}} /></body></html>
main.cpp file:
#include "crow.h"
int main()
{
crow::SimpleApp app;
CROW_ROUTE(app, "/")([](const crow::request& req){
crow::mustache::context x;
x["src"] = req.url_params.get("src");
auto page = crow::mustache::load("test.html");
return page.render(x);
});
app.port(8888).run();
}
The malicious payload: http://localhost:8888/?src=x%20onerror%3Dalert(1)