CVE-2021-28834 : Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatter

Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.

Published 2021-03-19 07:15:13

Updated 2021-04-19 20:39:46

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2021-28834

Debian » Debian Linux » Version: 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 32
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Kramdown Project » Kramdown » For Ruby
Versions before (<) 2.3.1
cpe:2.3:a:kramdown_project:kramdown:*:*:*:*:*:ruby:*:*
Matching versions

EPSS FAQ

2.00%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 88 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:P	8.6	6.4	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

https://github.com/gettalong/kramdown/compare/REL_2_3_0...REL_2_3_1

Comparing REL_2_3_0...REL_2_3_1 · gettalong/kramdown · GitHub
Patch;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SYOLQKFL6IJCQLBXV34Z4TI4O54GESPR/

[SECURITY] Fedora 33 Update: rubygem-kramdown-2.2.1-10.fc33 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S3BBLUIDCUUR3NEE4NJLOCCAV3ALQ3O6/

[SECURITY] Fedora 34 Update: rubygem-kramdown-2.3.1-1.fc34 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://gitlab.com/gitlab-org/gitlab/-/commit/179329b5c3c118924fb242dc449d06b4ed6ccb66

Patch Kramdown syntax highlighter gem (179329b5) · Commits · GitLab.org / GitLab · GitLab
Patch;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJCJVYHPY6LNUFM6LYZIAUIYOMVT5QGV/

[SECURITY] Fedora 32 Update: rubygem-kramdown-2.1.0-5.fc32 - package-announce - Fedora Mailing-Lists
Third Party Advisory
https://github.com/gettalong/kramdown/pull/708

Restrict Rouge formatters to Rouge::Formatters namespace by stanhu · Pull Request #708 · gettalong/kramdown · GitHub
Exploit;Third Party Advisory
https://www.debian.org/security/2021/dsa-4890

Debian -- Security Information -- DSA-4890-1 ruby-kramdown
Third Party Advisory

Jump to