Out-of-bounds Write Affecting kernel-debuginfo package, versions <0:4.14.121-109.96.amzn2

Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo package and not the kernel-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

The Broadcom brcmfmac WiFi driver prior to commit 1b5e2423164b3670e8bc9174e4762d297990deff is vulnerable to a heap buffer overflow. If the Wake-up on Wireless LAN functionality is configured, 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 with compromised chipsets to compromise the host, or when used in combination with CVE-2019-9503, can be used remotely. 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.

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9500
• https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html
• https://git.kernel.org/linus/1b5e2423164b3670e8bc9174e4762d297990deff
• https://kb.cert.org/vuls/id/166939/