CVE-2021-41816

Publication date 2 December 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

CGI.escape_html in Ruby before 2.7.5 and 3.x before 3.0.3 has an integer overflow and resultant buffer overflow via a long string on platforms (such as Windows) where size_t and long have different numbers of bytes. This also affects the CGI gem before 0.3.1 for Ruby.

Read the notes from the security team

Status

Package Ubuntu Release Status
ruby2.3 16.04 LTS xenial
Not affected
14.04 LTS trusty Ignored end of standard support
ruby2.5 18.04 LTS bionic
Not affected
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support
ruby2.7 21.10 impish
Fixed 2.7.4-1ubuntu3.1
21.04 hirsute
Fixed 2.7.2-4ubuntu1.3
20.04 LTS focal
Fixed 2.7.0-5ubuntu1.6
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support
ruby3.0 22.04 LTS jammy
Fixed 3.0.2-7ubuntu2
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support

Notes

leosilva

introduced by https://github.com/ruby/cgi/commit/3a62e20f76ea42ff0b4d45f2952479eab266ae1c

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H