AddThis Sharing Buttons <= 5.0.12 - Authenticated Cross-Site Scripting
Strategic Overview
- Status
- Patched in 5.0.13
- Affected Plugin
- WordPress Share Buttons Plugin – AddThis
- Affected Version
< 5.0.13- CVSS
- 4.8Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2015-9439
At a glance
CVE-2015-9439 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WordPress Share Buttons Plugin WordPress plugin, affecting versions < 5.0.13. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 5.0.13; sites on affected versions should update now. Disclosed August 2015, reported by Marcin Probola.
Vulnerability Overview
The addthis plugin before 5.0.13 for WordPress has CSRF with resultant XSS via the wp-admin/options-general.php?page=addthis_social_widget pubid parameter.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in WordPress Share Buttons Plugin < 5.0.13 takes any authenticated account. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For WordPress Share Buttons Plugin the fix is 5.0.13: builds < 5.0.13 are affected, anything from 5.0.13 onward is not.
Remediation
Update to version 5.0.13, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to WordPress Share Buttons Plugin: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WordPress Share Buttons Plugin 5.0.13 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in WordPress Share Buttons Plugin – AddThis
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