[DRE-maint] Bug#985569: ruby-kramdown: CVE-2021-28834

[Salvatore Bonaccorso]

Source: ruby-kramdown
Version: 2.3.0-4
Severity: grave
Tags: security upstream
Justification: user security hole
Forwarded: https://github.com/gettalong/kramdown/pull/708
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for ruby-kramdown.

CVE-2021-28834[0]:
| Kramdown before 2.3.1 does not restrict Rouge formatters to the
| Rouge::Formatters namespace, and thus arbitrary classes can be
| instantiated.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-28834
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28834
[1] https://github.com/gettalong/kramdown/pull/708
[2] https://github.com/gettalong/kramdown/commit/d6a1cbcb2caa2f8a70927f176070d126b2422760
[3] https://bugzilla.redhat.com/show_bug.cgi?id=1941044
[4] https://gitlab.com/gitlab-org/gitlab/-/commit/179329b5c3c118924fb242dc449d06b4ed6ccb66

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore