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://email@example.com/T/#u > ) >
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