Broadcom brcmfmac WiFi Driver Wake-up on Wireless LAN brcmf_wowl_nd_results WiFi Packet heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in Broadcom brcmfmac WiFi Driver. This issue affects the function brcmf_wowl_nd_results of the component Wake-up on Wireless LAN. The manipulation as part of WiFi Packet leads to heap-based overflow. This vulnerability is uniquely identified as CVE-2019-9500. The attack can only be initiated within the local network. No exploit exists. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Broadcom brcmfmac WiFi Driver (Hardware Driver Software) (affected version unknown). This issue affects the function brcmf_wowl_nd_results of the component Wake-up on Wireless LAN. The manipulation as part of a WiFi Packet leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 04/17/2019. The weakness was disclosed 01/16/2020. The identification of this vulnerability is CVE-2019-9500 since 03/01/2019. The exploitation is known to be difficult. The attack can only be done within the local network. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 274 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277795 (Fedora Security Update for kernel kernel-headers kernel-tools (FEDORA-2019-1e8a4c6958)).

Applying the patch 1b5e2423164b3670e8bc9174e4762d297990deff is able to eliminate this problem.

The entry VDB-149088 is pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Hardware Driver Software

Vendor

• Broadcom

Name

• brcmfmac WiFi Driver

License

• commercial

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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