WP Live Chat Support Pro <= 8.0.06 - Remote Code Execution via unrestricted file upload
Strategic Overview
- Status
- Patched in 8.0.07
- Affected Plugin
- wp-live-chat-support-pro
- Affected Version
<= 8.0.06- CVSS
- 9.8Critical
- Weakness type
- CWE-434 · Unrestricted Upload of File with Dangerous Type
- CVE
CVE-2018-12426
At a glance
CVE-2018-12426 is a critical-severity Unrestricted Upload of File with Dangerous Type vulnerability in the wp-live-chat-support-pro WordPress plugin, affecting versions <= 8.0.06. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 8.0.07; sites on affected versions should update now. Disclosed March 2019, reported by Riccardo ten Cate.
Vulnerability Overview
The WP Live Chat Support Pro plugin before 8.0.07 for WordPress is vulnerable to unauthenticated Remote Code Execution due to client-side validation of allowed file types, as demonstrated by a v1/remote_upload request with a .php filename and the image/jpeg content type.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-434: Unrestricted Upload of File with Dangerous Type
Reaching this weakness in wp-live-chat-support-pro <= 8.0.06 takes a caller who can reach the endpoint. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.
If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For wp-live-chat-support-pro the fix is 8.0.07: builds <= 8.0.06 are affected, anything from 8.0.07 onward is not.
Remediation
Update to version 8.0.07, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to wp-live-chat-support-pro: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: wp-live-chat-support-pro 8.0.07 closes this, and updating the plugin is the step that ends it.
- Firewall
- Scanner
- Alerts
External References
Related records
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