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ReDoS based DoS vulnerability in Action Dispatch

Low severity GitHub Reviewed Published Jan 18, 2023 to the GitHub Advisory Database • Updated Feb 2, 2024

Package

bundler actionpack (RubyGems)

Affected versions

>= 3.0.0, < 5.2.8.15
>= 7.0.0, < 7.0.4.1
>= 6.0.0, < 6.1.7.1

Patched versions

5.2.8.15
7.0.4.1
6.1.7.1

Description

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 X_FORWARDED_HOST 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 X_FORWARDED_HOST 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

References

Published to the GitHub Advisory Database Jan 18, 2023
Reviewed Jan 18, 2023
Published by the National Vulnerability Database Feb 9, 2023
Last updated Feb 2, 2024

Severity

Low

EPSS score

0.159%
(53rd percentile)

CVE ID

CVE-2023-22792

GHSA ID

GHSA-p84v-45xj-wwqj

Source code

Credits

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