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CVE-2017-11173

Missing Regex anchor in Rack-Cors allows malicious third party site to perform CORS request

8.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.34%Up 1.3 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 8.8

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.

Record
CVE-2017-11173
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2017-11173
Updated
2026-11-02
EUVDEUVD-2018-0207 No score

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.

Record
EUVD-2018-0207
Updated
2026-11-03
GitHub AdvisoriesGHSA-2j9c-9vmv-7m39 8.8

Missing Regex anchor in Rack-Cors allows malicious third party site to perform CORS request

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.

Record
GHSA-2j9c-9vmv-7m39
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSV 8.8

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.

Record
CVE-2017-11173
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2017-11173 8.8

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.

Record
DEBIAN-CVE-2017-11173
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-2j9c-9vmv-7m39 8.8

Missing Regex anchor in Rack-Cors allows malicious third party site to perform CORS request

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.

Record
GHSA-2j9c-9vmv-7m39
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2017-11173 8.8

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.

Record
UBUNTU-CVE-2017-11173
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
rack-cors
RubyGems
before 0.4.1
0.4.1
ruby-rack-cors
Debian:12
before 0.4.1-1
0.4.1-1
ruby-rack-cors
Debian:13
before 0.4.1-1
0.4.1-1
ruby-rack-cors
Debian:14
before 0.4.1-1
0.4.1-1
ruby-rack-cors
Debian:9
before 0.4.0-1+deb9u1, plus listed versions
0.4.0-1
0.4.0-1+deb9u1
rack-cors
RubyGems
before 0.4.1, plus listed versions
0.1.00.1.10.2.00.2.20.2.4
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0.2.50.2.60.2.70.2.80.2.90.3.00.3.10.4.0
0.4.1
ruby-rack-cors
Ubuntu:16.04:LTS
before 0.4.0-1+deb9u1build0.16.04.1, plus listed versions
0.4.0-1
0.4.0-1+deb9u1build0.16.04.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-11173 is a high vulnerability (CVSS 8.8) in Rack-cors Project Rack-cors, published July 13, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.34%, the 83rd percentile. Fixed in rack-cors 0.4.1.

References

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