CVE-2024-21496 Cross-site Scripting in github.com/greenpau/caddy-security
An attacker can execute malicious scripts in a user's browser via the Referer header, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2024-21496?
CVE-2024-21496 is a medium-severity cross-site scripting vulnerability in github.com/greenpau/caddy-security, published on 17 Feb 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
All versions of the package github.com/greenpau/caddy-security are vulnerable to Cross-site Scripting (XSS) via the Referer header, due to improper input sanitization. Although the Referer header is sanitized by escaping some characters that can allow XSS (e.g., [&], [<], [>], ["], [']), it does not account for the attack based on the JavaScript URL scheme (e.g., javascript:alert(document.domain)// payload). Exploiting this vulnerability may not be trivial, but it could lead to the execution of malicious scripts in the context of the target user’s browser, compromising user sessions.
Weakness: CWE-79
Which versions are affected by CVE-2024-21496?
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-2024-21496?
No fix has been published for CVE-2024-21496 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2024-21496 being exploited?
There is no known exploitation of CVE-2024-21496 in the wild and no public exploit code.
Other vulnerabilities in github.com/greenpau/caddy-security
- CVE-2023-52430 caddy-security plugin for Caddy vulnerable to reflected Cross-site Scripting
- CVE-2024-21498 Server-Side Request Forgery in github.com/greenpau/caddy-security
- CVE-2024-21492 Insufficient Session Expiration in github.com/greenpau/caddy-security
- CVE-2024-21500 Improper Restriction of Excessive Authentication Attempts in github.com/greenpau/caddy-security
Sources
Also known as GHSA-ff72-ff42-c3gw, GO-2024-2559.