CVE-2019-9503 Broadcom brcmfmac driver is vulnerable to a frame validation bypass
Remote attackers can bypass frame validation in the Broadcom brcmfmac driver via USB, potentially executing arbitrary code or causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2019-9503?
CVE-2019-9503 is a high-severity vulnerability in Redhat Enterprise Linux, published on 16 Jan 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-20
Which versions are affected by CVE-2019-9503?
It affects 2 products.
Products include Broadcom Brcmfmac Driver, Redhat Enterprise Linux.
How do I fix CVE-2019-9503?
Apply the vendor's patch.
Is CVE-2019-9503 being exploited?
There is no known exploitation of CVE-2019-9503 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
Sources
Also known as CVE-2019-9466, DEBIAN-CVE-2019-9503, GHSA-6g85-84jx-q393, UBUNTU-CVE-2019-9503.