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CVE-2019-9503

7.9 · HIGH

The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass.

Published Jan 16, 2020CWE-20EPSS 3.29%

Overview

CVE-2019-9503 is a high-severity vulnerability. It was published on January 16, 2020 and has a CVSS 3.1 base score of 7.9 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.9, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.htmlRefbugzilla.redhat.com/show_bug.cgi?id=1701842Refbugzilla.suse.com/show_bug.cgi?id=1132828Refgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4176ec356c73a46c07c181c6d04039fafa34a9fRefkb.cert.org/vuls/id/166939/Refpeople.canonical.com/~ubuntu-security/cve/2019/CVE-2019-9503.htmlRefsecurity-tracker.debian.org/tracker/CVE-2019-9503Refblog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.htmlRefbugzilla.redhat.com/show_bug.cgi?id=1701842Refbugzilla.suse.com/show_bug.cgi?id=1132828

How CyberStrike helps

Frequently asked questions

What is CVE-2019-9503?

CVE-2019-9503 is a high-severity vulnerability. It was published on January 16, 2020 and has a CVSS 3.1 base score of 7.9 (HIGH).

How severe is CVE-2019-9503?

This vulnerability has a CVSS 3.1 base score of 7.9, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-9503?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-9503?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-9503 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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