CVE-2021-21705

Public on 2021-09-02
Modified on 2021-09-08
Description
A flaw was found in php. Currently, php's FILTER_VALIDATE_URL check doesn't recognize some non-compliant RFC 3986 URLs and returns them as valid. This flaw allows an attacker to craft URLs, which depending on how the URL filter checking is used on the application side, lead to Server Side Request Forgery. This issue presents an integrity risk for the application, as eventually, the attacker can manipulate resources that shouldn't be fully available for users.
Severity
Medium
CVSS v3 Base Score
5.3
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 php73 2021-09-02 22:54 ALAS-2021-1532

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD CVSSv2 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
NVD CVSSv3 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N