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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jaskalnik, jskarvad, jsynacek, msekleta, security-response-team, thozza
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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:
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:


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


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

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):