Auth bypass in Ringcentral
CVE-2019-13450
In the Zoom Client through 4.4.4 and RingCentral 7.0.136380.0312 on macOS, remote attackers can force a user to join a video call with the video camera active. This occurs because any web site can interact with the Zoom web server on localhost port 19421 or 19424. NOTE: a machine remains vulnerable if the Zoom Client was installed in the past and then uninstalled. Blocking exploitation requires additional steps, such as the ZDisableVideo preference and/or killing the web server, deleting the ~/.zoomus directory, and creating a ~/.zoomus plain file.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.035 (88.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.035 · newest: 0.035 · change: 0.000
Affected products
- Ringcentral — versions 7.0.136380.0312
- Zoom
Weakness classification (CWE)
References
- medium.com/@jonathan.leitschuh/zoom-zero-day-4-million-webcams-maybe-an-rce-jus…
- assets.zoom.us/docs/pdf/Zoom+Response+Video-On+Vulnerability.pdf (Vendor Advisory)
- news.ycombinator.com/item (Third Party Advisory, Issue Tracking)
- blog.zoom.us/wordpress/2019/07/08/response-to-video-on-concern/ (Vendor Advisory)
- twitter.com/moreati/status/1148548799813640193 (Third Party Advisory)
- www.securityfocus.com/bid/109082 (VDB Entry, Third Party Advisory, vdb-entry)
- twitter.com/zoom_us/status/1148710712241295361 (Third Party Advisory)
- bugs.chromium.org/p/chromium/issues/detail (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-13450?
- CVE-2019-13450 is a medium-severity vulnerability in Ringcentral, classified under Missing Authorization. CVSS score: 6.5/10. Published 2019-07-09.
- How severe is CVE-2019-13450?
- Medium severity. CVSS v3 base score is 6.5 out of 10.