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CVE-2020-7063— Files added to tar with Phar::buildFromIterator have all-access permissions

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（PHP：Hypertext Preprocessor，PHP：超文本预处理器）是PHPGroup和开放源代码社区的共同维护的一种开源的通用计算机脚本语言。该语言主要用于Web开发，支持多种数据库及操作系统。 PHP 7.2.28之前的7.2.x版本、7.3.15之前的7.3.x版本和7.4.3之前的7.4.x版本中存在安全漏洞，该漏洞源于使用‘PharData::buildFromIterator()’函数创建PHAR归档文件时，该文件被分配了默认文件（0666或所有访问权限）。攻击者可利用该漏洞

CVSS 5.5 · Medium EPSS 1.59% · P75

Possible ATT&CK Techniques 1 AI

T1560.001 · Archive via Utility
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I. Basic Information for CVE-2020-7063

Vulnerability Information
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Vulnerability Title
Files added to tar with Phar::buildFromIterator have all-access permissions
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions 7.2.x below 7.2.28, 7.3.x below 7.3.15 and 7.4.x below 7.4.3, when creating PHAR archive using PharData::buildFromIterator() function, the files are added with default permissions (0666, or all access) even if the original files on the filesystem were with more restrictive permissions. This may result in files having more lax permissions than intended when such archive is extracted.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
权限预留不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP（PHP：Hypertext Preprocessor，PHP：超文本预处理器）是PHPGroup和开放源代码社区的共同维护的一种开源的通用计算机脚本语言。该语言主要用于Web开发，支持多种数据库及操作系统。 PHP 7.2.28之前的7.2.x版本、7.3.15之前的7.3.x版本和7.4.3之前的7.4.x版本中存在安全漏洞，该漏洞源于使用‘PharData::buildFromIterator()’函数创建PHAR归档文件时，该文件被分配了默认文件（0666或所有访问权限）。攻击者可利用该漏洞
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 ~ 7.3.15 -

II. Public POCs for CVE-2020-7063

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III. Intelligence Information for CVE-2020-7063

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Vendor Advisories for CVE-2020-7063 (4)

Mailing List Discussions for CVE-2020-7063 (2)

Other References for CVE-2020-7063 (1)

Same Patch Batch · PHP Group · 2020-02-27 · 3 CVEs total

CVE-2020-7062 7.5 HIGH Null Pointer Dereference in PHP Session Upload Progress
CVE-2020-7061 6.5 MEDIUM heap-buffer-overflow in phar_extract_file

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-281

V. Comments for CVE-2020-7063

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