Date: Thu, 12 Sep 2019 21:14:53 +0200 From: Salvatore Bonaccorso <carnil@...ian.org> To: oss-security@...ts.openwall.com Cc: Jouni Malinen <j@...fi> Subject: Re: hostapd/wpa_supplicant: AP mode PMF disconnection protection bypass On Wed, Sep 11, 2019 at 01:37:01PM +0300, Jouni Malinen wrote: > Published: September 11, 2019 > Latest version available from: https://w1.fi/security/2019-7/ > > Vulnerability > > hostapd (and wpa_supplicant when controlling AP mode) did not perform > sufficient source address validation for some received Management frames > and this could result in ending up sending a frame that caused > associated stations to incorrectly believe they were disconnected from > the network even if management frame protection (also known as PMF) was > negotiated for the association. This could be considered to be a denial > of service vulnerability since PMF is supposed to protect from this type > of issues. It should be noted that if PMF is not enabled, there would be > no protocol level protection against this type of denial service > attacks. > > An attacker in radio range of the access point could inject a specially > constructed unauthenticated IEEE 802.11 frame to the access point to > cause associated stations to be disconnected and require a reconnection > to the network. > > > Vulnerable versions/configurations > > All hostapd and wpa_supplicants versions with PMF support > (CONFIG_IEEE80211W=y) and a runtime configuration enabled AP mode with > PMF being enabled (optional or required). In addition, this would be > applicable only when using user space based MLME/SME in AP mode, i.e., > when hostapd (or wpa_supplicant when controlling AP mode) would process > authentication and association management frames. This condition would > be applicable mainly with drivers that use mac80211. > > > Possible mitigation steps > > - Merge the following commit to wpa_supplicant/hostapd and rebuild: > > AP: Silently ignore management frame from unexpected source address > > This patch is available from https://w1.fi/security/2019-7/ > > - Update to wpa_supplicant/hostapd v2.10 or newer, once available CVE-2019-16275 was assigned for this issue (requested via https://cveform.mitre.org/). Regards, Salvatore
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