Bug 1470687 (CVE-2017-11173)

Summary:	CVE-2017-11173 rubygem-rack-cors: Missing anchor in generated regex in rack/cors.rb#L256 may permit forged malicious requests
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	valtri
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:	2018-12-31 16:08:10 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:	1470688, 1470689
Bug Blocks:

Description Pedro Sampaio 2017-07-13 13:06:12 UTC

Missing anchor in generated regex for rack-cors before 0.4.1
allows a malicious third-party site to perform CORS requests.
If the configuration were intended to allow only the trusted
example.com domain name and not the malicious example.net domain name,
then example.com.example.net (as well as example.com-example.net) would
be inadvertently allowed.

Upstream patch:

https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6

References:

https://github.com/cyu/rack-cors/blob/v0.4.0/lib/rack/cors.rb#L256
https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.html

Comment 1 Pedro Sampaio 2017-07-13 13:06:35 UTC

Created rubygem-rack-cors tracking bugs for this issue:

Affects: epel-all [bug 1470688]
Affects: fedora-all [bug 1470689]