Content Injection Affecting Crow package, versions [,0.3+4)
Snyk CVSS
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Test your applications- Snyk ID SNYK-UNMANAGED-CROW-2336164
- published 12 Jan 2022
- disclosed 12 Jan 2022
- credit Snyk Security Team
Introduced: 12 Jan 2022
CVE-2021-23824 Open this link in a new tabHow 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)