CVE-2023-38492

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Summary

CVECVE-2023-38492
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-07-27 16:15:00 UTC
Updated2023-08-03 13:35:00 UTC
DescriptionKirby 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.

Risk And Classification

Problem Types: CWE-770

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Getkirby Kirby All All All All

References

ReferenceSourceLinkTags
Release 3.5.8.3 · getkirby/kirby · GitHub MISC github.com
Release 3.6.6.3 · getkirby/kirby · GitHub MISC github.com
Denial of service from unlimited password lengths · Advisory · getkirby/kirby · GitHub MISC github.com
Release 3.8.4.1 · getkirby/kirby · GitHub MISC github.com
Fix password length vulnerability · getkirby/kirby@0e10ce3 · GitHub MISC github.com
Release 3.7.5.2 · getkirby/kirby · GitHub MISC github.com
Release 3.9.6 · getkirby/kirby · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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