Arbitrary file upload in 3cx Live Chat
CVE-2019-11185
The WP Live Chat Support Pro plugin through 8.0.26 for WordPress contains an arbitrary file upload vulnerability. This results from an incomplete patch for CVE-2018-12426. Arbitrary file upload is achieved by using a non-blacklisted executable file extension in conjunction with a whitelisted file extension, and prepending "magic bytes" to the payload to pass MIME checks. Specifically, an unauthenticated remote user submits a crafted file upload POST request to the REST api remote_upload endpoint. The file contains data that will fool the plugin's MIME check into classifying it as an image (which is a whitelisted file extension) and finally a trailing .phtml file extension.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.043 (90.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- wordpress.org/plugins/wp-live-chat-support/ (Third Party Advisory)
- wp-livechat.com/ (Vendor Advisory)
- wpvulndb.com/vulnerabilities/9320 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-11185?
- CVE-2019-11185 is a critical-severity vulnerability in 3cx Live Chat, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2019-06-03.
- How severe is CVE-2019-11185?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2019-11185 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.