CVE-2021-29447

EUVD-2021-16064

15.04.2021, 21:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.1 HIGH	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
GitHub_M	CNA	7.1 HIGH	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 99%

Affected Products (NVD)

Vendor	Product	Version
wordpress	wordpress	5.6.0 ≤ 𝑥 < 5.7.1
debian	debian_linux	9.0
debian	debian_linux	10.0

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

wordpress

bookworm	6.1.6+dfsg1-0+deb12u1 fixed
bookworm (security)	6.1.6+dfsg1-0+deb12u1 fixed
bullseye	5.7.11+dfsg1-0+deb11u1 fixed
bullseye (security)	5.7.11+dfsg1-0+deb11u1 fixed
sid	6.6.1+dfsg1-1 fixed
trixie	6.6.1+dfsg1-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

wordpress

bionic	needs-triage
focal	needs-triage
groovy	ignored
hirsute	ignored
impish	ignored
jammy	needs-triage
kinetic	ignored
lunar	ignored
mantic	ignored
noble	needs-triage
trusty	dne
xenial	needs-triage

Known Exploits!

Common Weakness Enumeration

CWE-611 - Improper Restriction of XML External Entity Reference
The software 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.

References

http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.html

http://packetstormsecurity.com/files/164198/WordPress-5.7-Media-Library-XML-Injection.html

https://blog.sonarsource.com/wordpress-xxe-security-vulnerability/

https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhh

https://lists.debian.org/debian-lts-announce/2021/04/msg00017.html

https://wordpress.org/news/category/security/