CVE-2023-38492
published 2023-07-27CVE-2023-38492: 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…
PriorityP344high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
1.03%
59.3th percentile
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.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| getkirby | cms | >= 0 < 3.5.8.3 | 3.5.8.3 |
| getkirby | cms | >= 3.6.0 < 3.6.6.3 | 3.6.6.3 |
| getkirby | cms | >= 3.7.0 < 3.7.5.2 | 3.7.5.2 |
| getkirby | cms | >= 3.8.0 < 3.8.4.1 | 3.8.4.1 |
| getkirby | cms | >= 3.9.0 < 3.9.6 | 3.9.6 |
| getkirby | kirby | < 3.5.8.3 | 3.5.8.3 |
| getkirby | kirby | — | — |
| getkirby | kirby | — | — |
| getkirby | kirby | — | — |
| getkirby | kirby | — | — |
| getkirby | kirby | >= 3.5.0 < 3.5.8.3 | 3.5.8.3 |
| getkirby | kirby | >= 3.6.0 < 3.6.6.3 | 3.6.6.3 |
| getkirby | kirby | >= 3.7.0 < 3.7.5.2 | 3.7.5.2 |
| getkirby | kirby | >= 3.8.0 < 3.8.4.1 | 3.8.4.1 |
| getkirby | kirby | >= 3.9.0 < 3.9.6 | 3.9.6 |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
Denial of service from unlimited password lengths
osv·2023-07-28
CVE-2023-38492 [MEDIUM] Denial of service from unlimited password lengths
Denial of service from unlimited password lengths
### TL;DR
This vulnerability 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.
----
### Introduction
Denial of service (DoS) is a type of attack in which an attacker floods a service with the intention to limit performance or availability for legitimate users of the service.
In the variation described in this advisory (a so called application layer denial of service attack), it is performed by causing a computationally expensive task to be run on the server. This may then cause a performance bottleneck.
### Impac
GHSA
Denial of service from unlimited password lengths
ghsa·2023-07-28
CVE-2023-38492 [MEDIUM] CWE-770 Denial of service from unlimited password lengths
Denial of service from unlimited password lengths
### TL;DR
This vulnerability 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.
----
### Introduction
Denial of service (DoS) is a type of attack in which an attacker floods a service with the intention to limit performance or availability for legitimate users of the service.
In the variation described in this advisory (a so called application layer denial of service attack), it is performed by causing a computationally expensive task to be run on the server. This may then cause a performance bottleneck.
### Impac
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/getkirby/kirby/commit/0e10ce3b0c2b88656564b8ff518ddc99136ac43ehttps://github.com/getkirby/kirby/releases/tag/3.5.8.3https://github.com/getkirby/kirby/releases/tag/3.6.6.3https://github.com/getkirby/kirby/releases/tag/3.7.5.2https://github.com/getkirby/kirby/releases/tag/3.8.4.1https://github.com/getkirby/kirby/releases/tag/3.9.6https://github.com/getkirby/kirby/security/advisories/GHSA-3v6j-v3qc-cxffhttps://github.com/getkirby/kirby/commit/0e10ce3b0c2b88656564b8ff518ddc99136ac43ehttps://github.com/getkirby/kirby/releases/tag/3.5.8.3https://github.com/getkirby/kirby/releases/tag/3.6.6.3https://github.com/getkirby/kirby/releases/tag/3.7.5.2https://github.com/getkirby/kirby/releases/tag/3.8.4.1https://github.com/getkirby/kirby/releases/tag/3.9.6https://github.com/getkirby/kirby/security/advisories/GHSA-3v6j-v3qc-cxff
2023-07-27
Published