CVE-2019-9500: Broadcom brcmfmac driver is vulnerable to a heap buffer overflow

First published: Tue Feb 19 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>

Credit: cret@cert.org cret@cert.org

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