UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
28 explicit affected versions
1 explicit affected versions
12 explicit affected versions
1 explicit affected versions
64 explicit affected versions
19 explicit affected versions
6 explicit affected versions
191 explicit affected versions
23 explicit affected versions
5 explicit affected versions
32 explicit affected versions
5 explicit affected versions
34 explicit affected versions
4 explicit affected versions
22 explicit affected versions
1 explicit affected versions
23 explicit affected versions
66 explicit affected versions
24 explicit affected versions
29 explicit affected versions
94 explicit affected versions
11 explicit affected versions
51 explicit affected versions
34 explicit affected versions
54 explicit affected versions
6 explicit affected versions
24 explicit affected versions
26 explicit affected versions
21 explicit affected versions
75 explicit affected versions
49 explicit affected versions
8 explicit affected versions
6 explicit affected versions
6 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html
- https://ubuntu.com/security/CVE-2019-9503
- https://ubuntu.com/security/notices/USN-3979-1
- https://ubuntu.com/security/notices/USN-3980-1
- https://ubuntu.com/security/notices/USN-3980-2
- https://ubuntu.com/security/notices/USN-3981-1
- https://ubuntu.com/security/notices/USN-3981-2
- https://ubuntu.com/security/notices/USN-4076-1
- https://ubuntu.com/security/notices/USN-4095-1
- https://www.cve.org/CVERecord?id=CVE-2019-9503