CVE-2024-21500 Improper Restriction of Excessive Authentication Attempts in github.com/greenpau/caddy-security

Medium 4.8 Published 17 Feb 2024 Updated 5 Dec 2024

Attackers can bypass 2FA rate limiting by automating the multistep authentication process, allowing unauthorized access attempts.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-21500?

CVE-2024-21500 is a medium-severity vulnerability in github.com/greenpau/caddy-security, published on 17 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

All versions of the package github.com/greenpau/caddy-security are vulnerable to Improper Restriction of Excessive Authentication Attempts via the two-factor authentication (2FA). Although the application blocks the user after several failed attempts to provide 2FA codes, attackers can bypass this blocking mechanism by automating the application’s full multistep 2FA process.

Weakness: CWE-307

Which versions are affected by CVE-2024-21500?

3 open source packages ship an affected version, including github.com/greenpau/caddy-security. It affects 1 product.

Package	Affected	Fixed in
`github.com/greenpau/caddy-security` Go	All versions	None
`github.com/greenpau/caddy-security` Go	All versions to `1.1.23`	None
`github.com/greenpau/caddy-security` Go	All versions to `1.1.23`	None

Products include Authcrunch Caddy-Security.

How do I fix CVE-2024-21500?

No fix has been published for CVE-2024-21500 yet. Limit exposure of the affected software until one is available.

Is CVE-2024-21500 being exploited?

There is no known exploitation of CVE-2024-21500 in the wild and no public exploit code.

Sources

Also known as GHSA-vfph-hjfv-cpv2, GO-2024-2563.