InsecureCookie.qhelp

<!DOCTYPE qhelp PUBLIC
  "-//Semmle//qhelp//EN"
  "qhelp.dtd">
<qhelp>

<overview>
<p>Cookies without the <code>Secure</code> flag set may be transmitted using HTTP instead of HTTPS.
This leaves them vulnerable to being read by a third party attacker. If a sensitive cookie such as a session
key is intercepted this way, it would allow the attacker to perform actions on a user's behalf.</p>
</overview>

<recommendation>
<p>Always set <code>secure</code> to <code>True</code>, or add <code>; Secure;</code> to the cookie's raw header value, to ensure SSL is used to transmit the cookie
with encryption.</p>
</recommendation>

<example>
<p>In the following examples, the cases marked GOOD show secure cookie attributes being set; whereas in the case marked BAD they are not set.</p>
<sample src="examples/InsecureCookie.py" />
</example>

<references>
<li>Detectify: <a href="https://support.detectify.com/support/solutions/articles/48001048982-cookie-lack-secure-flag">Cookie lack Secure flag</a>.</li>
<li>PortSwigger: <a href="https://portswigger.net/kb/issues/00500200_tls-cookie-without-secure-flag-set">TLS cookie without secure flag set</a>.</li>
<li>MDN: <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie">Set-Cookie</a>.</li>
</references>

</qhelp>