CVE-2023-22792: High severity rubyonrails Rails vulnerability
A regular expression based DoS vulnerability in Action Dispatch <6.0.6.1,< 6.1.7.1, and <7.0.4.1. Specially crafted cookies, in combination with a specially crafted XFORWARDEDHOST header can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability All users running an affected release should either upgrade or use one of the workarounds immediately.
Other sources
Specially crafted cookies, in combination with a specially crafted XFORWARDEDHOST header can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.
We recommend that all users upgrade to one of the FIXED versions. In the meantime, users can mitigate this vulnerability by using a load balancer or other device to filter out malicious XFORWARDEDHOST headers before they reach the application.
— Red Hat
There is a possible regular expression based DoS vulnerability in Action Dispatch. This vulnerability has been assigned the CVE identifier CVE-2023-22792.
Versions Affected: >= 3.0.0 Not affected: < 3.0.0 Fixed Versions: 5.2.8.15 (Rails LTS), 6.1.7.1, 7.0.4.1 Impact
Specially crafted cookies, in combination with a specially crafted XFORWARDEDHOST header can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability All users running an affected release should either upgrade or use one of the workarounds immediately. Releases
The FIXED releases are available at the normal locations. Workarounds
We recommend that all users upgrade to one of the FIXED versions. In the meantime, users can mitigate this vulnerability by using a load balancer or other device to filter out malicious XFORWARDEDHOST headers before they reach the application. Patches
To aid users who aren’t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.
6-1-Use-string-split-instead-of-regex-for-domain-parts.patch - Patch for 6.1 series 7-0-Use-string-split-instead-of-regex-for-domain-parts.patch - Patch for 7.0 series
Please note that only the 7.0.Z and 6.1.Z series are supported at present, and 6.0.Z for severe vulnerabilities. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.
https://rubyonrails.org/2023/1/17/Rails-Versions-6-0-6-1-6-1-7-1-7-0-4-1-have-been-released
— GitHub
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2023-22792?
CVE-2023-22792 is a regular expression based DoS vulnerability in Action Dispatch <6.0.6.1, <6.1.7.1, and <7.0.4.1.
How does CVE-2023-22792 work?
CVE-2023-22792 exploits a vulnerability in the regular expression engine of Action Dispatch, which can be triggered by specially crafted cookies and a specially crafted X_FORWARDED_HOST header, causing the engine to enter a state of catastrophic backtracking and potentially leading to a denial-of-service condition.
What software versions are affected by CVE-2023-22792?
CVE-2023-22792 affects Action Dispatch versions <6.0.6.1, <6.1.7.1, and <7.0.4.1.
How can I fix CVE-2023-22792?
To fix CVE-2023-22792, update your Rails framework to versions 6.0.6.1, 6.1.7.1, or 7.0.4.1 or later.
Where can I find more information about CVE-2023-22792?
You can find more information about CVE-2023-22792 at the following references: [1](https://discuss.rubyonrails.org/t/cve-2023-22792-possible-redos-based-dos-vulnerability-in-action-dispatch/82115), [2](https://github.com/rails/rails/commit/7a7f37f146aa977350cf914eba20a95ce371485f), [3](https://security-tracker.debian.org/tracker/CVE-2023-22792).