CVE-2021-32697 Form validation can be skipped
Attackers can bypass form validation by crafting specific GET requests, potentially triggering unintended side effects in form finishers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-32697?
CVE-2021-32697 is a medium-severity vulnerability in neos form, published on 21 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
neos/forms is an open source framework to build web forms. By crafting a special `GET` request containing a valid form state, a form can be submitted without invoking any validators. Form state is secured with an HMAC that is still verified. That means that this issue can only be exploited if Form Finishers cause side effects even if no form values have been sent. Form Finishers can be adjusted in a way that they only execute an action if the submitted form contains some expected data. Alternatively a custom Finisher can be added as first finisher. This regression was introduced with https://github.com/neos/form/commit/049d415295be8d4a0478ccba97dba1bb81649567
Weakness: CWE-20
Which versions are affected by CVE-2021-32697?
6 open source packages ship an affected version, including neos/form. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
neos/form Packagist | From 1.2.0 | 4.3.3 |
neos/form Packagist | From 1.2.0 | 4.3.3 |
neos/form Packagist | From 5.0.0 | 5.0.9 |
neos/form Packagist | From 5.0.0 | 5.0.9 |
neos/form Packagist | From 5.1.0 | 5.1.3 |
neos/form Packagist | From 5.1.0 | 5.1.3 |
Products include Neos Form.
How do I fix CVE-2021-32697?
Upgrade neos/form to a fixed version for your release line: 4.3.3, 5.0.9 or 5.1.3.
Is CVE-2021-32697 being exploited?
There is no known exploitation of CVE-2021-32697 in the wild and no public exploit code.
Sources
Also known as GHSA-m5vx-8chx-qvmm.