Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Broadcom | Brcmfmac Driver | - |
| Redhat | Enterprise Linux | 6.0 |
Related Weaknesses (CWE)
References
- https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.htmlThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1701842Issue TrackingThird Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1132828Issue TrackingThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4PatchThird Party Advisory
- https://kb.cert.org/vuls/id/166939/Third Party AdvisoryUS Government Resource
- https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-9503.htmlThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2019-9503Third Party Advisory
- https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.htmlThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1701842Issue TrackingThird Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1132828Issue TrackingThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4PatchThird Party Advisory
- https://kb.cert.org/vuls/id/166939/Third Party AdvisoryUS Government Resource
- https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-9503.htmlThird Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2019-9503Third Party Advisory
FAQ
What is CVE-2019-9503?
CVE-2019-9503 is a vulnerability with a CVSS score of 7.9 (HIGH). 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 rem...
How severe is CVE-2019-9503?
CVE-2019-9503 has been rated HIGH with a CVSS base score of 7.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-9503?
Check the references section above for vendor advisories and patch information. Affected products include: Broadcom Brcmfmac Driver, Redhat Enterprise Linux.