CVE-2021-22902 – actionpack

Package

Manager: gem
Name: actionpack
Vulnerable Version: >=6.0.0 <6.0.3.7 || >=6.1.0 <6.1.3.2

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.01063 pctl0.7683

Details

Denial of Service in Action Dispatch Impact ------ There is a possible Denial of Service vulnerability in Action Dispatch. Carefully crafted Accept headers can cause the mime type parser in Action Dispatch to do catastrophic backtracking in the regular expression engine. Releases -------- The fixed releases are available at the normal locations. Workarounds ----------- The following monkey patch placed in an initializer can be used to work around the issue. ```ruby module Mime class Type MIME_REGEXP = /\A(?:\*\/\*|#{MIME_NAME}\/(?:\*|#{MIME_NAME})(?>\s*#{MIME_PARAMETER}\s*)*)\z/ end end ``` 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. * 6-0-Prevent-catastrophic-backtracking-during-mime-parsin.patch - Patch for 6.0 series * 6-1-Prevent-catastrophic-backtracking-during-mime-parsin.patch - Patch for 6.1 series Please note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. 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. Credits ------- Thanks to Security Curious <security...@pm.me> for reporting this!

Metadata

Created: 2021-05-05T19:48:21Z
Modified: 2023-08-08T15:37:20Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-g8ww-46x2-2p65/GHSA-g8ww-46x2-2p65.json
CWE IDs: ["CWE-400"]
Alternative ID: GHSA-g8ww-46x2-2p65
Finding: F002
Auto approve: 1