Date: Tue, 4 Jun 2019 16:37:21 +0200 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: huangwen <huangwen@...usgroup.com.cn> Subject: Re: Marvell Wifi Driver mwifiex_uap_parse_tail_ies Heap Overflow On Sat, Jun 01, 2019 at 06:07:57PM +0800, huangwen wrote: > There is heap-based buffer overflow in marvell wifi chip driver in Linux > kernel,allows local users to cause a denial of service(system crash) or > possibly execute arbitrary code. > The problem is inside mwifiex_uap_parse_tail_ies function in > drivers/net/wireless/marvell/mwifiex/ie.c. > > There are two memcpy in this function.The memcpy in while loop will be > called when element_id is not equal to WLAN_EID_SSID,WLAN_EID_SUPP_RATES > etc. > > The copy dst buffer gen_ie->ie_buffer is a array with size > IEEE_MAX_IE_SIZE(256), the src buffer is element in cfg80211_beacon_data > from user space. > > There is not len check for two memcpy in this function. > > If special elements are constructed (E.g. > WLAN_EID_SUPPORTED_OPERATING_CLASSES) to make memcpy called repeatedly, will > finally trigger the overflow. This is now CVE-2019-10126. > https://email@example.com Alexander
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