CVE-2021-21707

CVE Details

Release Date:	2021-11-29
Impact:	None	What is this?

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.

See more information about CVE-2021-21707 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.3
Vector String:	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Version:	3.0
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	Low
Integrity Impact:	None
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (libzip)	ELSA-2022-7628	2022-11-15
Oracle Linux version 8 (php)	ELSA-2022-7628	2022-11-15
Oracle Linux version 8 (php-pear)	ELSA-2022-7628	2022-11-15
Oracle Linux version 8 (php-pecl-apcu)	ELSA-2022-7628	2022-11-15
Oracle Linux version 8 (php-pecl-rrd)	ELSA-2022-7628	2022-11-15
Oracle Linux version 8 (php-pecl-xdebug)	ELSA-2022-7628	2022-11-15
Oracle Linux version 8 (php-pecl-zip)	ELSA-2022-7628	2022-11-15