Bug 1737663 (CVE-2019-13456)

Summary:	CVE-2019-13456 freeradius: eap-pwd: Information leak due to aborting when needing more than 10 iterations
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ascheel, dpal, lemenkov, nikolai.kondrashov, pkis, rharwood, rschiron
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An information leak was discovered in the implementation of EAP-pwd in freeradius. An attacker could initiate several EAP-pwd handshakes to leak information, which can then be used to recover the user's WiFi password by performing dictionary and brute-force attacks.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-28 16:33:36 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1737664, 1751796, 1751797, 1751798
Bug Blocks:	1740725

Description Pedro Sampaio 2019-08-06 01:38:06 UTC

A flaw was found in the implementation of EAP-pwd in FreeRADIUS. An attacker could initiate several EAP-pwd handshakes to leak information, which can then be used to recover the user's WiFi password by performing dictionary and brute-force attacks.

References:

https://wpa3.mathyvanhoef.com/#new

Comment 1 Pedro Sampaio 2019-08-06 01:38:24 UTC

Created freeradius tracking bugs for this issue:

Affects: fedora-all [bug 1737664]

Comment 2 Riccardo Schirone 2019-09-12 11:24:31 UTC

Upstream patch:
https://github.com/FreeRADIUS/freeradius-server/commit/3ea2a5a026e73d81cd9a3e9bbd4300c433004bfa

Comment 3 Riccardo Schirone 2019-09-12 15:08:51 UTC

EAP-PWD support was first added in freeradius 3.0.0, so earlier versions as shipped in Red Hat Enterprise Linux 6 and earlier are not affected.

Comment 4 Riccardo Schirone 2019-09-12 15:10:14 UTC

Statement:

This issue did not affect the versions of freeradius as shipped with Red Hat Enterprise Linux 5, and 6 as they did not include support for EAP-pwd.

Comment 5 Riccardo Schirone 2019-09-12 15:30:49 UTC

Given a random EAP-pwd token an attacker can learn if all 10 iterations of the compute_password_element() function failed. This happens once every 2048 handshakes and in that case an error frame is sent to the client. This information could be abused by an attacker to brute force the password, as in the Dragonblood attack.

Comment 8 errata-xmlrpc 2020-04-28 15:38:51 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:1672 https://access.redhat.com/errata/RHSA-2020:1672

Comment 9 Product Security DevOps Team 2020-04-28 16:33:36 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-13456

Comment 10 errata-xmlrpc 2020-09-29 20:20:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3984 https://access.redhat.com/errata/RHSA-2020:3984