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CVE-2023-1380: security - Re: A USB-accessible slab-out-of-bounds read in Linux kernel driver
A slab-out-of-bound read problem was found in brcmf_get_assoc_ies in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c in the Linux Kernel. This issue could occur when assoc_info->req_len data is bigger than the size of the buffer, defined as WL_EXTRA_BUF_MAX, leading to a denial of service.
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Date: Tue, 14 Mar 2023 10:34:35 +0900 From: Jisoo Jang <jisoo.jang@…sei.ac.kr> To: oss-security@…ts.openwall.com Cc: Dokyung Song <dokyungs@…sei.ac.kr>, Minsuk Kang <linuxlovemin@…sei.ac.kr> Subject: Re: A USB-accessible slab-out-of-bounds read in Linux kernel driver
This bug was assigned CVE-2023-1380.Best, Jisoo
On Mon, Mar 13, 2023 at 8:10 PM Jisoo Jang <jisoo.jang@…sei.ac.kr> wrote:
=== Description ===
A slab-out-of-bounds read bug was found in the Broadcom Full MAC Wi-Fi driver (e.g., brcmfmac.ko in the linux-modules-extra package in Ubuntu),
The bug occurs in kmemdup() called from brcmf_get_assoc_ies(), when assoc_info->req_len, data from a URB provided by a USB device, is bigger than the size of buffer which is defined as WL_EXTRA_BUF_MAX.
The driver duplicates the data of cfg->extra_buf to conn_info->req_ie as much as assoc_info->req_le, which could exceed the size of the buffer.
The data passes through cfg80211_connect_done(), __cfg80211_connect_result(); in the end, it reaches nl80211_send_connect_result() that will form netlink messages with the data read outside the bounds of the buffer.
This data, which may contain sensitive information in the kernel, could be sent to a userspace socket by __netlink_sendskb() during this multicasting process.
=== Fix ===
A patch was reported to the linux wireless mailing list and successfully reviewed by the maintainer.
( https://lore.kernel.org/linux-wireless/[email protected]/T/#u )
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