Vulnerability CVE-2021-21706

Vulnerability Name:

CVE-2021-21706 (CCN-210569)

Assigned:

2021-09-06

Published:

2021-09-06

Updated:

2021-11-03

Summary:

In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions.

CVSS v3 Severity:

6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): High Availibility (A): None

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): High Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): High Availibility (A): None

CVSS v2 Severity:

4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): Partial Availibility (A): None

4.9 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:N/I:C/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): High Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): None Integrity (I): Complete Availibility (A): None

Vulnerability Type:

CWE-22

Vulnerability Consequences:

File Manipulation

References:

Source: MITRE
Type: CNA
CVE-2021-21706

Source: CCN
Type: PHP Sec Bug #81420
ZipArchive::extractTo may extract outside of destination dir

Source: CONFIRM
Type: Issue Tracking, Patch, Vendor Advisory
N/A

Source: XF
Type: UNKNOWN
php-cve202121706-dir-traversal(210569)

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20211029-0007/

Source: CCN
Type: PHP Web site
PHP

Vulnerable Configuration:

Configuration 1:

cpe:/a:php:php:*:*:*:*:*:*:*:* (Version >= 7.3.0 and < 7.3.31)

OR cpe:/a:php:php:*:*:*:*:*:*:*:* (Version >= 7.4.0 and < 7.4.24)

OR cpe:/a:php:php:*:*:*:*:*:*:*:* (Version >= 8.0.0 and < 8.0.11)

AND

cpe:/o:microsoft:windows:-:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:8075	P	apache2-mod_php7-7.4.33-150400.4.22.1 on GA media (Moderate)	2023-06-12
oval:org.opensuse.security:def:3434	P	apache2-mod_perl-2.0.8-11.43 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:95064	P	apache2-mod_php7-7.4.25-150400.2.8 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:113132	P	php7-7.4.24-1.1 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:113137	P	php8-8.0.11-1.1 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:106565	P	php7-7.4.24-1.1 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:106567	P	php8-8.0.11-1.1 on GA media (Moderate)	2021-10-01

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