Bug 1283219 (CVE-2015-8023)

Summary:	CVE-2015-8023 strongswan: Authentication bypass in eap-mschapv2 plugin
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	avagarwa, carnil, pwouters
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	strongswan 5.3.4	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-05-25 16:22:29 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:	1283220, 1283221, 1287533, 1287534
Bug Blocks:	1283224

Description Adam Mariš 2015-11-18 13:23:15 UTC

A vulnerability in eap-mschapv2 plugin allowing a malicious client to trick the server into successfully concluding the authentication without providing valid credential. The problem is caused by insufficient verification of the local state in the server implementation of the EAP-MSCHAPv2 protocol. In fact, the client can simply send the last message in the EAP-MSCHAPv2 protocol (an empty Success message) as response to the server's initial Challenge message to pass the authentication successfully. Affected are IKEv2 connections that use EAP-MSCHAPv2 to authenticate clients via eap-mschapv2 plugin. Affected are all strongswan versions 4.2.12, up to and including 5.3.3.

Upstream patch:

https://download.strongswan.org/security/CVE-2015-8023/

External reference:

https://www.strongswan.org/blog/2015/11/16/strongswan-vulnerability-%28cve-2015-8023%29.html

Comment 1 Adam Mariš 2015-11-18 13:23:41 UTC

Created strongswan tracking bugs for this issue:

Affects: fedora-all [bug 1283220]
Affects: epel-all [bug 1283221]

Comment 3 Stefan Cornelius 2015-12-11 12:51:05 UTC

Statement:

This issue did not affect the versions of strongimcv as shipped with Red Hat Enterprise Linux 7, as they did not include support for the eap-mschapv2 plugin.