Bug 1586071 (CVE-2018-11574)

Summary:	CVE-2018-11574 ppp: Remote client crash in ppp EAP-TLS patch
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jaskalnik, jskarvad, jsynacek, msekleta, security-response-team, thozza
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-22 04:31:51 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:	1590086, 1590087
Bug Blocks:	1586073

Description Andrej Nemec 2018-06-05 12:30:46 UTC

A vulnerability was found in pppd+EAP-TLS. A malicious client could cause a pppd server instance to crash.

Upstream patch:

https://www.nikhef.nl/~janjust/ppp/ppp-2.4.7-eaptls-mppe-1.101.patch

Comment 2 Doran Moppert 2018-06-12 04:16:30 UTC

Public via:

http://seclists.org/oss-sec/2018/q2/173

Comment 3 Doran Moppert 2018-06-12 04:16:57 UTC

Created ppp tracking bugs for this issue:

Affects: fedora-all [bug 1590087]

Comment 5 Doran Moppert 2018-06-12 05:03:40 UTC

This flaw does not affect vanilla ppp, only versions patched and compiled with the EAPTLS patch.  It can be triggered in both client and server.

Examining the entry points to eap-tls.c, it seems that EAPTLS negotiation will be aborted if get_eaptls_secret() fails.  This will occur if the ppp instance is running without being configured for EAPTLS (see README.eap-tls).

Comment 6 Doran Moppert 2018-06-12 05:13:13 UTC

Mitigation:

PPP instances must be configured for EAP-TLS authentication to expose this vulnerability. For ppp servers, the file `/etc/ppp/eaptls-server' must exist. For clients, either `/etc/ppp/eaptls-client` must exist or command-line options `ca`, `cert` and `key` must be provided.

Comment 9 Product Security DevOps Team 2020-04-22 04:31:51 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-2018-11574