Bug 1283219 (CVE-2015-8023) - CVE-2015-8023 strongswan: Authentication bypass in eap-mschapv2 plugin
Summary: CVE-2015-8023 strongswan: Authentication bypass in eap-mschapv2 plugin
Alias: CVE-2015-8023
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1283220 1283221 1287533 1287534
Blocks: 1283224
TreeView+ depends on / blocked
Reported: 2015-11-18 13:23 UTC by Adam Mariš
Modified: 2021-02-17 04:42 UTC (History)
3 users (show)

Fixed In Version: strongswan 5.3.4
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2018-05-25 16:22:29 UTC

Attachments (Terms of Use)

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:


External reference:


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

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.

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