Improper input validation in Broadcom Brcmfmac Driver
CVE-2019-9503
The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass. If the brcmfmac driver receives a firmware event frame from a remote source, the is_wlc_event_frame function will cause this frame to be discarded and unprocessed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a wifi dongle). This can allow firmware event frames from a remote source to be processed. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.9 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.033 (88.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000
Affected products
- Broadcom Brcmfmac Driver
- Broadcom Brcmfmac Wifi Driver — versions commit prior to a4176ec356c73a46c07c181c6d04039fafa34a9f
- Red Hat Enterprise Linux — versions 6.0, 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html (Third Party Advisory)
- kb.cert.org/vuls/id/166939/ (US Government Resource, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-9503.html (Third Party Advisory)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- security-tracker.debian.org/tracker/CVE-2019-9503 (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-9503?
- CVE-2019-9503 is a high-severity vulnerability in Broadcom Brcmfmac Driver, classified under Improper Input Validation. CVSS score: 7.9/10. Published 2020-01-16.
- How severe is CVE-2019-9503?
- High severity. CVSS v3 base score is 7.9 out of 10.
- Is CVE-2019-9503 known to be exploited?
- 21 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.