Kirby is a content management system. A vulnerability in versions prior to 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6 affects all Kirby sites with user accounts (unless Kirby's API and Panel are disabled in the config). The real-world impact of this vulnerability is limited, however we still recommend to update to one of the patch releases because they also fix more severe vulnerabilities. Kirby's authentication endpoint did not limit the password length. This allowed attackers to provide a password with a length up to the server's maximum request body length. Validating that password against the user's actual password requires hashing the provided password, which requires more CPU and memory resources (and therefore processing time) the longer the provided password gets. This could be abused by an attacker to cause the website to become unresponsive or unavailable. Because Kirby comes with a built-in brute force protection, the impact of this vulnerability is limited to 10 failed logins from each IP address and 10 failed logins for each existing user per hour. The problem has been patched in Kirby 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6. In all of the mentioned releases, the maintainers have added password length limits in the affected code so that passwords longer than 1000 bytes are immediately blocked, both when setting a password and when logging in.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Kirby is a content management system. A vulnerability in versions prior to 3.5.8.3, 3.6.6.3, 3.7.5.2,
    3.8.4.1, and 3.9.6 affects all Kirby sites with user accounts (unless Kirby's API and Panel are disabled
    in the config). The real-world impact of this vulnerability is limited, however we still recommend to
    update to one of the patch releases because they also fix more severe vulnerabilities. Kirby's
    authentication endpoint did not limit the password length. This allowed attackers to provide a password
    with a length up to the server's maximum request body length. Validating that password against the user's
    actual password requires hashing the provided password, which requires more CPU and memory resources (and
    therefore processing time) the longer the provided password gets. This could be abused by an attacker to
    cause the website to become unresponsive or unavailable. Because Kirby comes with a built-in brute force
    protection, the impact of this vulnerability is limited to 10 failed logins from each IP address and 10
    failed logins for each existing user per hour. The problem has been patched in Kirby 3.5.8.3, 3.6.6.3,
    3.7.5.2, 3.8.4.1, and 3.9.6. In all of the mentioned releases, the maintainers have added password length
    limits in the affected code so that passwords longer than 1000 bytes are immediately blocked, both when
    setting a password and when logging in. (CVE-2023-38492)

ID	Name	Product	Family	Severity
409694	SCA: security update for getkirby/cms (GHSA-3v6j-v3qc-cxff)	Tenable Cloud Security	SCA Checks	high
409694	SCA: security update for getkirby/cms (GHSA-3v6j-v3qc-cxff)	Tenable Self-Hosted Container Security	SCA Checks	high

Detections

Analytics

CVE-2023-38492

high

Tenable Plugins

high

high