CVE-2021-41816
Published: 2 December 2021
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.
Notes
| Author | Note |
|---|---|
| leosilva | introduced by https://github.com/ruby/cgi/commit/3a62e20f76ea42ff0b4d45f2952479eab266ae1c |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
ruby2.7 Launchpad, Ubuntu, Debian |
upstream |
Needs triage
|
| xenial |
Ignored
(end of standard support)
|
|
| trusty |
Ignored
(end of standard support)
|
|
| focal |
Released
(2.7.0-5ubuntu1.6)
|
|
| hirsute |
Released
(2.7.2-4ubuntu1.3)
|
|
| impish |
Released
(2.7.4-1ubuntu3.1)
|
|
|
ruby3.0 Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
| upstream |
Needs triage
|
|
| xenial |
Ignored
(end of standard support)
|
|
| jammy |
Released
(3.0.2-7ubuntu2)
|
|
|
ruby2.3 Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
|
|
|
ruby2.5 Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
| upstream |
Needs triage
|
|
| xenial |
Ignored
(end of standard support)
|
|
| bionic |
Not vulnerable
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| 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 |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41816
- https://www.ruby-lang.org/en/news/2021/11/24/buffer-overrun-in-cgi-escape_html-cve-2021-41816/
- https://github.com/ruby/cgi/commit/c728632c1c09d46cfd4ecbff9caaa3651dd1002a
- https://ubuntu.com/security/notices/USN-5235-1
- NVD
- Launchpad
- Debian