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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/20230309104457.22628-1-jisoo.jang@yonsei.ac.kr/T/#u
> )
>
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