kirby3-security-headers

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3.6.6.2

🚨 Security release

User enumeration in the code-based login and password reset forms

Severity: medium (CVSS score 4.8)

Errors that occur during the processing of the code-based login and password reset were in some cases passed to the user. This includes errors of the code challenge itself (e.g. if the email could not be sent) and errors thrown inside the user.login:failed hook.

This vulnerability allowed user enumeration, which is a type of vulnerability that allows attackers to confirm which users are registered in a Kirby installation. This information can be abused for social engineering attacks against users of the site or to find out the organizational structure of the company.

This vulnerability only affects you if you are using the code or password-reset auth method with the auth.methods option. It can only be successfully exploited under server configuration conditions outside of the attacker's control.

Thanks to Florian Merz (@​florianmrz) of hatchery.io for responsibly reporting the identified issue.

User enumeration in the brute force protection

Severity: medium (CVSS score 6.5)

We used the opportunity to review other parts of Kirby's authentication handling and found another part that is affected by a similar user enumeration vulnerability caused by a response discrepancy in Kirby's brute force protection system.

This vulnerability affects all Kirby sites with user accounts (unless Kirby's API and Panel are disabled in the config). It can only be exploited for targeted attacks because the attack does not scale to brute force.

3.6.6.1

🚨 Security release

Cross-site scripting (XSS) from content entered in the tags and multiselect fields

Severity: high (CVSS score 7.1)

The tags and multiselect fields allow to select tags from an autocompleted list. The tags field also allows to enter new tags or edit existing tags. Kirby already handled escaping of the autocompleted tags, but unfortunately the Panel used HTML rendering for new or edited tags as well as for custom tags from the content file.

This allowed attackers with Panel access to store malicious HTML code in a tag. The browser of the victim who visited the modified page in the Panel will then have rendered this malicious HTML code.

It also allowed self-inflicted XSS attacks in the tags field (meaning that malicious code is executed in the browser of the user who entered it). This could be used in social engineering attacks where a victim is convinced by an attacker to enter malicious code into a tags field.

Visitors without Panel access could only use this attack vector if your site allows changing the content of a tags or multiselect field from a frontend form (for example user self-registration or the creation of pages from a contact or other frontend form). If you validate or sanitize the provided form data, you are already protected against such attacks by external visitors.

You are also not affected by these vulnerabilities if your site doesn't have untrustworthy users with Panel access or a way to modify field values from the frontend or if you don't use the tags or multiselect fields.

Note: The fixes for these vulnerabilities have the side effect that values in the tags and multiselect fields that come from dynamic options are displayed with double escaping (e.g. the & character is displayed as &). We will fix the double escaping issues with a refactoring of the options fields (tags, multiselect, checkboxes, radio, select and toggles) in Kirby 3.8.

3.6.6

🎉 Features

• New A::random() and $collection->random() methods to get one or multiple random items from arrays and collections, optionally shuffled. Unless shuffled, the overall order of the returned items is kept. #4270
• Added support for getting multiple properties from Toolkit\Obj objects and derived objects, like so: #4268

$thing = new Obj(['one' => '👋', 'two' => 'Kirby']);
</tr></table> 

... (truncated)

• c0a9265 Fix check for exception details in Auth::verifyChallenge as well
• cec506c Fix check for exception details
• 92a16d5 Update version number and cert bundle
• 29d4a6f Switch back to spaces for indentation
• 303f37c Unit tests for new auth behavior
• 411996d Adapt unit tests to new auth.debug option
• 38214ac Catch errors from user.login:failed hook
• cf0b8c7 Hide errors in production during rate limit check
• 501fd97 Use fail method throughout the Auth class
• 922a7ae New $auth->fail() method with auth.debug option
• Additional commits viewable in compare view

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