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CVE-2021-21706— ZipArchive::extractTo may extract outside of destination dir

Quick assessment

Affected
PHP Group PHP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PHP是一种在服务器端执行的脚本语言。 PHP 存在安全漏洞，该漏洞源于网络系统或产品缺乏有效的权限许可和访问控制措施。

CVSS 5.3 · Medium EPSS 1.44% · P73
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I. Basic Information for CVE-2021-21706

Vulnerability Information
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Vulnerability Title
ZipArchive::extractTo may extract outside of destination dir
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’../filedir’
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP是一种在服务器端执行的脚本语言。 PHP 存在安全漏洞，该漏洞源于网络系统或产品缺乏有效的权限许可和访问控制措施。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHP Group PHP 7.3.x ~ 7.3.31 -

II. Public POCs for CVE-2021-21706

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III. Intelligence Information for CVE-2021-21706

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Vendor Advisories for CVE-2021-21706 (1)

Same Patch Batch · PHP Group · 2021-10-04 · 3 CVEs total

CVE-2021-21704 5.0 MEDIUM Multiple vulnerabilities in Firebird client extension
CVE-2021-21705 4.3 MEDIUM Incorrect URL validation in FILTER_VALIDATE_URL

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-24

V. Comments for CVE-2021-21706

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