Bug 1586071 – CVE-2018-11574 ppp: Remote client crash in ppp EAP-TLS patch

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Bug 1586071 - (CVE-2018-11574) CVE-2018-11574 ppp: Remote client crash in ppp EAP-TLS patch

Summary:	CVE-2018-11574 ppp: Remote client crash in ppp EAP-TLS patch

Status:	NEW

Aliases:	CVE-2018-11574

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=moderate,public=20180612:0416,...
Keywords:	Security

Depends On:	1590086 1590087
Blocks:	1586073
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Reported:	2018-06-05 08:30 EDT by Andrej Nemec
Modified:	2018-06-12 01:24 EDT (History)
CC List:	7 users (show)

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Description Andrej Nemec 2018-06-05 08:30:46 EDT

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 00:16:30 EDT

Public via:

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

Comment 3 Doran Moppert 2018-06-12 00:16:57 EDT

Created ppp tracking bugs for this issue:

Affects: fedora-all [bug 1590087]

Comment 5 Doran Moppert 2018-06-12 01:03:40 EDT

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 01:13:13 EDT

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.

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