CVE-2023-3823

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.

CVSS Metrics

• v3.1•HIGH•Score: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Trends

Current EPSS score: 0.60%• Percentile: 70%

Techniques & Countermeasures

• CWE-611•Improper Restriction of XML External Entity Reference

  The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Affected Systems

• debian•debian_linux

  10.0

• fedoraproject•fedora

  38

• Unknown•PHP

  ≥ 8.0.*, < 8.0.30 | ≥ 8.1.*, < 8.1.22 | ≥ 8.2.*, < 8.2.8

• Unknown•PHP

  ≥ 8.0.0, < 8.0.30 | ≥ 8.1.0, < 8.1.22 | ≥ 8.2.0, < 8.2.9

References (4)

• https://github.com/php/php-src/security/advisories/GHSA-3qrf-m4j2-pcrr
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7NBF77WN6DTVTY2RE73IGPYD6M4PIAWA/
• https://security.netapp.com/advisory/ntap-20230825-0001/
• https://lists.debian.org/debian-lts-announce/2023/09/msg00002.html