CVE-2021-21706 : 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, i

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.

Published 2021-10-04 04:15:08

Updated 2021-11-03 20:24:36

Source PHP Group

View at NVD, CVE.org

Vulnerability category: Directory traversal

Products affected by CVE-2021-21706

PHP » PHP
Versions from including (>=) 8.0.0 and before (<) 8.0.11
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A
PHP » PHP
Versions from including (>=) 7.4.0 and before (<) 7.4.24
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A
PHP » PHP
Versions from including (>=) 7.3.0 and before (<) 7.3.31
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
Matching versions
When used together with: Microsoft » Windows » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-21706

EPSS FAQ

0.75%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 71 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21706

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: High Availability: None
5.3	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N	1.6	3.6	PHP Group
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: High Availability: None

CWE ids for CVE-2021-21706

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Assigned by: nvd@nist.gov (Primary)
CWE-24 Path Traversal: '../filedir'

The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize "../" sequences that can resolve to a location that is outside of that directory.

Assigned by: security@php.net (Secondary)

References for CVE-2021-21706

https://bugs.php.net/bug.php?id=81420

PHP :: Sec Bug #81420 :: ZipArchive::extractTo may extract outside of destination dir
Issue Tracking;Patch;Vendor Advisory
https://security.netapp.com/advisory/ntap-20211029-0007/

CVE-2021-21706 PHP Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory

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Vulnerability Details : CVE-2021-21706

Products affected by CVE-2021-21706

Exploit prediction scoring system (EPSS) score for CVE-2021-21706

CVSS scores for CVE-2021-21706

CWE ids for CVE-2021-21706

References for CVE-2021-21706