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
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2018-11574
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1590086 1590087
Blocks: 1586073
TreeView+ depends on / blocked
 
Reported: 2018-06-05 12:30 UTC by Andrej Nemec
Modified: 2021-02-17 00:11 UTC (History)
6 users (show)

Fixed In Version:
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Last Closed: 2020-04-22 04:31:51 UTC
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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
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