High severity · published Jul 13, 2017
CVE-2017-11173
Missing anchor in generated regex for rack-cors before 0.4.1 allows a malicious third-party site to perform CORS requests
8.8
CVSS
2.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
9.0 · source: NVD
RA
Rack-cors · Rack-cors Project
before 0.4.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-11173
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-11173
Mailing List
http://seclists.org/fulldisclosure/2017/Jul/22
Third Party Advisory
http://www.debian.org/security/2017/dsa-3931
Patch
https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6
Third Party Advisory
https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.html
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