CVE-2021-21707 Information

Description

In PHP versions 7.3.x below 7.3.33 7.4.x below 7.4.26 and 8.0.x below 8.0.13 certain XML parsing functions like simplexml_load_file() URL-decode the filename passed to them. If that filename contains URL-encoded NUL character this may cause the function to interpret this as the end of the filename thus interpreting the filename differently from what the user intended which may lead it to reading a different file than intended.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Reference

https://bugs.php.net/bug.php?id=79971 https://security.netapp.com/advisory/ntap-20211223-0005/ https://www.debian.org/security/2022/dsa-5082 https://www.tenable.com/security/tns-2022-09

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3