cve/2021/CVE-2021-21705.md

CVE-2021-21705

Description

In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.

POC

Reference

• https://www.oracle.com/security-alerts/cpujan2022.html

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/rmtec/modeswitcher