Low
2011/2012 Mac EFI firmware leaves BCM4331 wireless enabled when transferring control to the bootloader/OS
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Low
(1 user assessed)Very Low
(1 user assessed)Unknown
Unknown
Unknown
2011/2012 Mac EFI firmware leaves BCM4331 wireless enabled when transferring control to the bootloader/OS
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
The EFI firmware on Macs contains a full-fledged network stack for downloading OS X images from osrecovery.apple.com. Unfortunately on Macs introduced 2011 and 2012, EFI brings up the Broadcom 4331 wireless card on every boot and leaves it enabled even after ExitBootServices has been called. The card continues to assert its IRQ line, causing spurious interrupts if the IRQ is shared. It also corrupts memory by DMAing received packets, allowing for remote code execution over the air.
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Ratings
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Attacker ValueLow
-
ExploitabilityVery Low
Technical Analysis
This wasn’t vulnerable in OpenBSD, because it didn’t free the memory the chip was writing memory to back to the kernel. On Linux boxes running a kernel < 2016, this could be RCE over wireless, and was proven to be a DoS, but for only a short time since the Grub mitigation that put the chip to sleep helped a lot.
Basically depends on a lot of circumstances, on hardware that is increasingly aging and irrelevant.
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CVE ID
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