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CVE-2019-18978

Published: 14 November 2019

An issue was discovered in the rack-cors (aka Rack CORS Middleware) gem before 1.0.4 for Ruby. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.

From the Ubuntu Security Team

It was discovered that rack-cors did not properly handle relative file paths. An attacker could use this vulnerability to access arbitrary files.

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
ruby-rack-cors
Launchpad, Ubuntu, Debian
bionic Needed

disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Not vulnerable
(1.1.1-1)
groovy Not vulnerable
(1.1.1-1)
hirsute Not vulnerable
(1.1.1-1)
impish Not vulnerable
(1.1.1-1)
jammy Not vulnerable
(1.1.1-1)
kinetic Not vulnerable
(1.1.1-1)
lunar Not vulnerable
(1.1.1-1)
mantic Not vulnerable
(1.1.1-1)
noble Not vulnerable
(1.1.1-1)
trusty Does not exist

upstream Needs triage

xenial
Released (0.4.0-1+deb9u2build0.16.04.1)
Patches:
upstream: https://github.com/cyu/rack-cors/commit/e4d4fc362a4315808927011cbe5afcfe5486f17d

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N