CVE-2019-9503
The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.3 HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 3.29% probability · 88th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- broadcom/brcmfmac driver · redhat/enterprise linux
- Source
- cret@cert.org
References
- https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.htmlThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1701842Issue Tracking, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1132828Issue Tracking, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4176ec356c73a46c07c181c6d04039fafa34a9fPatch, Third Party Advisory
- https://kb.cert.org/vuls/id/166939/Third Party Advisory, US 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 Tracking, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1132828Issue Tracking, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4176ec356c73a46c07c181c6d04039fafa34a9fPatch, Third Party Advisory
- https://kb.cert.org/vuls/id/166939/Third Party Advisory, US 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.