Bug 1736869 (CVE-2019-12209)

Summary:	CVE-2019-12209 pam-u2f: insecure debug file handling leads to information disclosure
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	sethdjennings
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2019-08-02 13:18:22 UTC	Type:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1736870
Bug Blocks:

Description Marian Rehak 2019-08-02 08:42:23 UTC

Parsing of the configured authfile (default ~/.config/Yubico/u2f_keys) as root, does not properly verify that the path lacks symlinks pointing to other files on the system owned by root. If the debug option is enabled in the PAM configuration, part of the file contents of a symlink target will be logged, possibly revealing sensitive information.

External Reference:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=931991

Upstream Commit:

https://github.com/Yubico/pam-u2f/commit/7db3386fcdb454e33a3ea30dcfb8e8960d4c3aa3

Comment 1 Marian Rehak 2019-08-02 08:42:34 UTC

Created pam-u2f tracking bugs for this issue:

Affects: fedora-all [bug 1736870]

Comment 2 Product Security DevOps Team 2019-08-02 13:18:22 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.