REDHAT-BUG-1701224: Buffer Overflow
First published: Thu Apr 18 2019(Updated: )
If the Wake-up on Wireless LAN functionality is configured in the brcmfmac driver which only works with Broadcom FullMAC chipsets, a malicious event frame can be constructed to trigger an heap buffer overflow in the brcmf_wowl_nd_results() function. This vulnerability can be exploited by compromised chipsets to compromise the host, or when used in combination with another brcmfmac driver flaw (<a href="https://access.redhat.com/security/cve/CVE-2019-9503">CVE-2019-9503</a>), can be used remotely. This can result in a remote denial of service (DoS). Due to the nature of the flaw, a remote privilege escalation cannot be fully ruled out, although we believe it is unlikely. Introduced in: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3021ad9a4f009265e6063e617fb91306980af16c">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3021ad9a4f009265e6063e617fb91306980af16c</a> An upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1b5e2423164b3670e8bc9174e4762d297990deff">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1b5e2423164b3670e8bc9174e4762d297990deff</a> External References: <a href="https://kb.cert.org/vuls/id/166939/">https://kb.cert.org/vuls/id/166939/</a> <a href="https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html#cve-2019-9500-heap-buffer-overflow-in-brcmf-wowl-nd-results">https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html#cve-2019-9500-heap-buffer-overflow-in-brcmf-wowl-nd-results</a> <a href="https://www.bleepingcomputer.com/news/security/broadcom-wifi-driver-flaws-expose-computers-phones-iot-to-rce-attacks/">https://www.bleepingcomputer.com/news/security/broadcom-wifi-driver-flaws-expose-computers-phones-iot-to-rce-attacks/</a>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| brcmfmac driver |
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Reference Links
- https://access.redhat.com/security/cve/CVE-2019-9503
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3021ad9a4f009265e6063e617fb91306980af16c
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1b5e2423164b3670e8bc9174e4762d297990deff
- https://kb.cert.org/vuls/id/166939/
- https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html#cve-2019-9500-heap-buffer-overflow-in-brcmf-wowl-nd-results
- https://www.bleepingcomputer.com/news/security/broadcom-wifi-driver-flaws-expose-computers-phones-iot-to-rce-attacks/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1701225
- https://access.redhat.com/errata/RHSA-2019:2600
- https://access.redhat.com/errata/RHSA-2019:2609
- https://access.redhat.com/security/cve/cve-2019-9500
- https://access.redhat.com/errata/RHSA-2019:2703
- https://access.redhat.com/errata/RHSA-2019:2741
- https://access.redhat.com/errata/RHSA-2019:2945
- https://access.redhat.com/errata/RHSA-2019:3217
- https://access.redhat.com/errata/RHSA-2019:4168
- https://access.redhat.com/errata/RHSA-2019:4171
- https://bugzilla.redhat.com/show_bug.cgi?id=1701224
Frequently Asked Questions
What is the severity of REDHAT-BUG-1701224?
The severity of REDHAT-BUG-1701224 is critical due to the potential for heap buffer overflow exploitation.
How do I fix REDHAT-BUG-1701224?
To fix REDHAT-BUG-1701224, it is recommended to update the brcmfmac driver to the latest patched version.
What systems are affected by REDHAT-BUG-1701224?
The systems affected by REDHAT-BUG-1701224 are those using the Broadcom brcmfmac driver with Wake-up on Wireless LAN functionality.
What could an attacker do with REDHAT-BUG-1701224?
An attacker could exploit REDHAT-BUG-1701224 to execute arbitrary code on the victim's system by sending specially crafted event frames.
Is there a workaround for REDHAT-BUG-1701224?
A potential workaround for REDHAT-BUG-1701224 is to disable the Wake-up on Wireless LAN feature in the brcmfmac driver configuration.
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- vendor/broadcom
- canonical/brcmfmac driver