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Updated qhelp with a third example

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ubuntu
2020-06-10 23:09:35 +02:00
parent 92f9f320f9
commit cf3142e083
1 changed files with 5 additions and 2 deletions
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javascript/ql/src/experimental/Security/CWE-020/PostMessageNoOriginCheck.qhelp
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@@ -21,8 +21,11 @@ Always verify the sender's identity of incoming messages.
<p>In the first example, the `MessageEvent.data` is passed to the `eval` function withouth checking the origin. This means that any window can send arbitrary messages that will be executed in the window receiving the message</p>
<sample src="examples/postMessageNoOriginCheck.js" />
<p> In the second example, the `MessageEvent.origin` is checked against a trusted origin.
<sample src="examples/postMessageWithOriginCheck.js" />
<p> In the second example, the `MessageEvent.origin` is verified with an unsecure check. For example, using `event.origin.indexOf('www.example.com') > -1` can be baypassed because the string `www.example.com` could appear anywhere in `event.origin` (i.e. `www.example.com.mydomain.com`)
<sample src="examples/postMessageWithInsufficientCheck.js" />
<p> In the third example, the `MessageEvent.origin` is properly checked against a trusted origin.
<sample src="examples/postMessageWithInsufficientCheck.js" />
</example>