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CVE-2023-3823— Security issue with external entity loading in XML without enabling it

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，该漏洞源于在未启用XML的情况下加载外部实体，导致本地文件泄露。受影响的产品和版本：PHP 8.0.30之前的8.0版本，8.1.22之前的8.1版本，8.2.8之前的8.2版本。

CVSS 8.6 · High EPSS 1.64% · P76

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2023-3823

Vulnerability Information
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Vulnerability Title
Security issue with external entity loading in XML without enabling it
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 various XML functions rely on libxml global state to track configuration variables, like whether external entities are loaded. This state is assumed to be unchanged unless the user explicitly changes it by calling appropriate function. However, since the state is process-global, other modules - such as ImageMagick - may also use this library within the same process, and change that global state for their internal purposes, and leave it in a state where external entities loading is enabled. This can lead to the situation where external XML is parsed with external entities loaded, which can lead to disclosure of any local files accessible to PHP. This vulnerable state may persist in the same process across many requests, until the process is shut down.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 代码问题漏洞
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，该漏洞源于在未启用XML的情况下加载外部实体，导致本地文件泄露。受影响的产品和版本：PHP 8.0.30之前的8.0版本，8.1.22之前的8.1版本，8.2.8之前的8.2版本。
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 8.0.* ~ 8.0.30 -

II. Public POCs for CVE-2023-3823

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III. Intelligence Information for CVE-2023-3823

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Vendor Advisories for CVE-2023-3823 (2)

Mailing List Discussions for CVE-2023-3823 (2)

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group

V. Comments for CVE-2023-3823

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