XML External Entity (XXE) Injection Affecting php-bcmath package, versions <0:8.0.30-1.module+el8.8.0+20302+42d2b711


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.11% (46th percentile)

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  • Snyk IDSNYK-CENTOS8-PHPBCMATH-5852827
  • published23 Aug 2023
  • disclosed3 Aug 2023

Introduced: 3 Aug 2023

CVE-2023-3823  (opens in a new tab)
CWE-611  (opens in a new tab)

How to fix?

Upgrade Centos:8 php-bcmath to version 0:8.0.30-1.module+el8.8.0+20302+42d2b711 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php-bcmath package and not the php-bcmath package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1