CVE-2021-29447

WordPress Authenticated XXE attack when installation is running PHP 8

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled.

Wordpress es un CMS de código abierto. Un usuario con la capacidad de cargar archivos (como un Autor) puede explotar un problema de análisis de XML en Media Library conllevando a ataques de tipo XXE. Esto requiere que la instalación de WordPress utilice PHP versión 8. El acceso a archivos internos es posible en un ataque de tipo XXE con éxito. Esto ha sido parcheado en versión WordPress versión 5.7.1, junto con las versiones anteriores afectadas por medio de una versión menor. Se recomienda encarecidamente que mantenga habilitadas las actualizaciones automáticas

WordPress version 5.7 suffers from a Media Library XML external entity injection vulnerability.

*Credits: SonarSource

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-03-30 CVE Reserved
2021-04-15 CVE Published
2021-08-27 First Exploit
2024-08-03 CVE Updated
2024-10-05 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-611: Improper Restriction of XML External Entity Reference

CAPEC

References (20)

URL	Tag	Source
http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.html	Third Party Advisory
https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhh	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00017.html	Mailing List

URL	Date	SRC
https://www.exploit-db.com/exploits/50304	2021-09-20
https://github.com/motikan2010/CVE-2021-29447	2021-10-04
https://github.com/0xRar/CVE-2021-29447-PoC	2023-01-31
https://github.com/dnr6419/CVE-2021-29447	2022-01-10
https://github.com/Abdulazizalsewedy/CVE-2021-29447	2022-11-21
https://github.com/thomas-osgood/CVE-2021-29447	2023-03-28
https://github.com/elf1337/blind-xxe-controller-CVE-2021-29447	2022-11-11
https://github.com/viardant/CVE-2021-29447	2023-01-17
https://github.com/G01d3nW01f/CVE-2021-29447	2022-12-25
https://github.com/AssassinUKG/CVE-2021-29447	2021-08-27
https://github.com/andyhsu024/CVE-2021-29447	2023-04-30
https://github.com/b-abderrahmane/CVE-2021-29447-POC	2022-11-10
https://github.com/Val-Resh/CVE-2021-29447-POC	2022-11-06
http://packetstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.html	2024-08-03
https://blog.sonarsource.com/wordpress-xxe-security-vulnerability	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://wordpress.org/news/category/security	2022-10-27
https://www.debian.org/security/2021/dsa-4896	2022-10-27

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Wordpress Search vendor "Wordpress"		Wordpress Search vendor "Wordpress" for product "Wordpress"				>= 5.6.0 < 5.7.1 Search vendor "Wordpress" for product "Wordpress" and version " >= 5.6.0 < 5.7.1"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected