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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: valtri
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2018-12-31 16:08:10 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1470688, 1470689    
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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]