CVE-2023-39343: Sulu Observable Response Discrepancy on Admin Login
Impact
It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist.
Impacted by this issue are Sulu installation >= 2.5.0 and <2.5.10 using the newer Symfony Security System which is default since Symfony 6.0 but can be enabled in Symfony 5.4. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue.
Patches
The problem has been patched in version 2.5.10.
Workarounds
Create a custom AuthenticationFailureHandler which does not return the $exception->getMessage(); instead the $exception->getMessageKey();
References
Currently no references.
Other sources
Sulu is an open-source PHP content management system based on the Symfony framework. It allows over the Admin Login form to detect which user (username, email) exists and which one do not exist. Sulu Installation not using the old Symfony 5.4 security System and previous version are not impacted by this Security issue. The vulnerability has been patched in version 2.5.10.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2023-39343?
CVE-2023-39343 is a vulnerability in Sulu, an open-source PHP content management system based on the Symfony framework, that allows an attacker to detect which user (username, email) exists and which one does not exist through the Admin Login form.
What is the impact of CVE-2023-39343?
The impact of CVE-2023-39343 is that an attacker can determine the existence of users by exploiting the vulnerability in Sulu.
Which versions of Sulu are affected by CVE-2023-39343?
Sulu installation >= 2.5.0 and <2.5.10 are affected by CVE-2023-39343.
How can I fix CVE-2023-39343?
To fix CVE-2023-39343, update your Sulu installation to version 2.5.10 or higher.
Where can I find more information about CVE-2023-39343?
You can find more information about CVE-2023-39343 at the following references: [Link 1](https://github.com/sulu/sulu/commit/5f6c98ba030b2005793e2dc647cc938937ea889b), [Link 2](https://github.com/sulu/sulu/releases/tag/2.5.10), [Link 3](https://github.com/sulu/sulu/security/advisories/GHSA-wmwf-49vv-p3mr)