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CVE-2018-16471

Published: 13 November 2018

There is a possible XSS vulnerability in Rack before 2.0.6 and 1.6.11. Carefully crafted requests can impact the data returned by the `scheme` method on `Rack::Request`. Applications that expect the scheme to be limited to 'http' or 'https' and do not escape the return value could be vulnerable to an XSS attack. Note that applications using the normal escaping mechanisms provided by Rails may not impacted, but applications that bypass the escaping mechanisms, or do not use them may be vulnerable.

From the Ubuntu Security Team

It was discovered that Rack incorrectly handled carefully crafted requests. A remote attacker could use this issue to execute a cross-site scripting (XSS) attack.

Priority

Medium

Cvss 3 Severity Score

6.1

Score breakdown

Status

Package Release Status
ruby-rack
Launchpad, Ubuntu, Debian
groovy Not vulnerable
(2.0.6-3)
hirsute Not vulnerable
(2.0.6-3)
jammy Not vulnerable
(2.0.6-3)
bionic
Released (1.6.4-4ubuntu0.1)
trusty
Released (1.5.2-3+deb8u3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (1.6.4-3ubuntu0.1)
cosmic Ignored
(end of life)
disco Not vulnerable
(2.0.6-3)
eoan Not vulnerable
(2.0.6-3)
focal Not vulnerable
(2.0.6-3)
impish Not vulnerable
(2.0.6-3)
upstream
Released (1.5.2-3+deb8u2, 1.6.4-4+deb9u1, 1.6.11, 2.0.6)

Severity score breakdown

Parameter Value
Base score 6.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Changed
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N