Bug 1595584 (CVE-2018-12895)

Summary:	CVE-2018-12895 wordpress: Author users can execute arbitrary code by leveraging directory traversal on the wp-admin/post.php thumb parameter
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	fedora, kevin
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:30:39 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1595585, 1595586
Bug Blocks:

Description Andrej Nemec 2018-06-27 07:55:53 UTC

WordPress through 4.9.6 allows Author users to execute arbitrary code by leveraging directory traversal in the wp-admin/post.php thumb parameter, which is passed to the PHP unlink function and can delete the wp-config.php file. This is related to missing filename validation in the wp-includes/post.php wp_delete_attachment function. The attacker must have capabilities for files and posts that are normally available only to the Author, Editor, and Administrator roles. The attack methodology is to delete wp-config.php and then launch a new installation process to increase the attacker's privileges.

References:

https://blog.ripstech.com/2018/wordpress-file-delete-to-code-execution/

Comment 1 Andrej Nemec 2018-06-27 07:56:20 UTC

Created wordpress tracking bugs for this issue:

Affects: epel-all [bug 1595586]
Affects: fedora-all [bug 1595585]

Comment 2 Product Security DevOps Team 2019-06-10 10:30:39 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.