[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20190426214529.GA7525@eldamar.local>
Date: Fri, 26 Apr 2019 23:45:29 +0200
From: Salvatore Bonaccorso <carnil@...ian.org>
To: oss-security@...ts.openwall.com
Subject: Re: wpa_supplicant/hostapd: EAP-pwd message
reassembly issue with unexpected fragment
Hi,
On Thu, Apr 18, 2019 at 06:59:26PM +0300, Jouni Malinen wrote:
> Published: April 18, 2019
> Latest version available from: https://w1.fi/security/2019-5/
>
> Vulnerability
>
> EAP-pwd implementation in hostapd (EAP server) and wpa_supplicant (EAP
> peer) was discovered not to validate fragmentation reassembly state
> properly for a case where an unexpected fragment could be received. This
> could result in process termination due to NULL pointer dereference.
>
> An attacker in radio range of a station device with wpa_supplicant
> network profile enabling use of EAP-pwd could cause the wpa_supplicant
> process to terminate by constructing unexpected sequence of EAP
> messages. An attacker in radio range of an access point that points to
> hostapd as an authentication server with EAP-pwd user enabled in runtime
> configuration (or in non-WLAN uses of EAP authentication as long as the
> attacker can send EAP-pwd messages to the server) could cause the
> hostapd process to terminate by constructing unexpected sequence of EAP
> messages.
>
>
> Vulnerable versions/configurations
>
> All hostapd and wpa_supplicant versions with EAP-pwd support
> (CONFIG_EAP_PWD=y in the build configuration and EAP-pwd being enabled
> in the runtime configuration) are vulnerable against the process
> termination (denial of service) attack.
>
>
> Possible mitigation steps
>
> - Merge the following commits to wpa_supplicant/hostapd and rebuild:
>
> EAP-pwd peer: Fix reassembly buffer handling
> EAP-pwd server: Fix reassembly buffer handling
>
> These patches are available from https://w1.fi/security/2019-5/
>
> - Update to wpa_supplicant/hostapd v2.8 or newer, once available
MITRE (via cveform.mitre.org) assigned CVE-2019-11555 for this issue.
Regards,
Salvatore
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
