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CVE-2022-44572

Published: 9 February 2023

A denial of service vulnerability in the multipart parsing component of Rack fixed in 2.0.9.2, 2.1.4.2, 2.2.4.1 and 3.0.0.1 could allow an attacker tocraft input that can cause RFC2183 multipart boundary parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that parse multipart posts using Rack (virtually all Rails applications) are impacted.

Notes

AuthorNote
ccdm94
variable related to the regular expression that causes the DoS was
introduced in commit b3e90edf, together with RFC 2231 changes.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
ruby-rack
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Needed

jammy Needed

kinetic Needed

lunar Needed

trusty Not vulnerable
(code not present)
upstream
Released (2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://github.com/rack/rack/commit/dc50f8e495f67eb933b1fc33ebee550908d945e6 (v2.0.9.2)
upstream: https://github.com/rack/rack/commit/8291f502b0e1dcf514cc25c34e4bf0beec7a92ae (v2.1.4.2)
upstream: https://github.com/rack/rack/commit/19e49f0f185d7e42ed5b402baec6c897a8c48029 (v2.2.6.1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H