CVE-2017-11173

Description

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.

8.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 1.75% Top 20%

Vendor Advisory debian.org

Affected: n/a n/a

References

Link	Tags
http://seclists.org/fulldisclosure/2017/Jul/22	third party advisory mailing list
https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.html	third party advisory vdb entry
https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6	third party advisory patch
http://www.debian.org/security/2017/dsa-3931	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-11173?: CVE-2017-11173 has been scored as a high severity vulnerability.
How to fix CVE-2017-11173?: To fix CVE-2017-11173, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-11173 being actively exploited in the wild?: It is possible that CVE-2017-11173 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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