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CVE-2021-26271

Good to know:

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Date: January 26, 2021

It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).

Language: Java

Severity Score

Related Resources (8)

https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first
https://web.archive.org/web/20210128132707/https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first
https://github.com/ckeditor/ckeditor4
https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416
https://www.oracle.com//security-alerts/cpujul2021.html
https://nvd.nist.gov/vuln/detail/CVE-2021-26271
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.mend.io/vulnerability-database/CVE-2021-26271

Severity Score

Weakness Type (CWE)

Inclusion of Functionality from Untrusted Control Sphere

CWE-829

Inefficient Regular Expression Complexity

CWE-1333

Top Fix

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Upgrade Version

Upgrade to version limesurvey/limesurvey - dev-snyk-upgrade-09b43073972851b96ebd7683ed5b21ab;limesurvey/limesurvey - dev-snyk-upgrade-8e8193a6a781d5929de6292963cd2a21;limesurvey/limesurvey - dev-snyk-upgrade-66feccfba764223474d4b09ea736da24;limesurvey/limesurvey - dev-quota-remote-disable2;limesurvey/limesurvey - dev-fix-composer-license-format;limesurvey/limesurvey - 3.23.5+200923;limesurvey/limesurvey - 6.0.1+230411;limesurvey/limesurvey - 4.0.0-alpha+181212;limesurvey/limesurvey - dev-fix-16987;limesurvey/limesurvey - dev-clicks-test3;limesurvey/limesurvey - no_fix;limesurvey/limesurvey - dev-display-import-errors-master;limesurvey/limesurvey - dev-fix-model-relations;limesurvey/limesurvey - 2.65.2+170606;limesurvey/limesurvey - 3.27.28+211208;limesurvey/limesurvey - dev-querybuilder1;limesurvey/limesurvey - dev-detached;limesurvey/limesurvey - 3.27.33+220125;limesurvey/limesurvey - dev-dependabot/npm_and_yarn/assets/packages/questions/timer/loader-utils-1.4.2;limesurvey/limesurvey - dev-basic;limesurvey/limesurvey - 3.28.14+220608;limesurvey/limesurvey - 4.1.17+200414;limesurvey/limesurvey - dev-dependabot/npm_and_yarn/assets/packages/adminsidepanel/terser-4.8.1;limesurvey/limesurvey - dev-kill-travis;limesurvey/limesurvey - dev-fixv3-16987;limesurvey/limesurvey - dev-survey-defaultsettings;limesurvey/limesurvey - dev-fix-tests;limesurvey/limesurvey - dev-survey-booleans3;limesurvey/limesurvey - 3.28.18+220706;limesurvey/limesurvey - dev-dependabot/npm_and_yarn/assets/packages/adminbasics/loader-utils-2.0.3;limesurvey/limesurvey - 5.2.14+220214;limesurvey/limesurvey - dev-fix-typo;limesurvey/limesurvey - dev-add-before-get-template-event;limesurvey/limesurvey - dev-develop-develop;limesurvey/limesurvey - 3.0.0-beta.1+170720;limesurvey/limesurvey - 3.27.35+220208;aropixel/admin-bundle - v1.2.37;aropixel/admin-bundle - dev-feature/v1.2.36/david/multilang;aropixel/admin-bundle - no_fix;aropixel/admin-bundle - v1.3.8;aropixel/admin-bundle - v1.2.20;aropixel/admin-bundle - v1.2.44;aropixel/admin-bundle - v0.1.6;aropixel/admin-bundle - v1.2.40;aropixel/admin-bundle - 1.2.30;drupal-ckeditor-libraries-group/dialogadvtab - 4.16.0;drupal-ckeditor-libraries-group/dialogadvtab - 4.7.2;ckeditor4 - 4.16.0;intelogie/ckeditor-dev - no_fix;gfrodriguez/yii2-ckeditor - no_fix;copona/copona - dev-dependabot/composer/league/flysystem-1.1.9;copona/copona - 0.1.x-dev;copona/copona - dev-orm-eloquent;copona/copona - dev-tax-calculation;copona/copona - dev-dev;copona/copona - dev-dependabot/composer/phpmailer/phpmailer-6.6.4;copona/copona - dev-media-manager;ckeditor-full - 4.16.0;ahyadessam/laravel-adminlte - 1.0.5;ahyadessam/laravel-adminlte - no_fix;org.webjars.npm:github-com-ckeditor-ckeditor4:no_fix;org.webjars.npm:github-com-ckeditor-ckeditor-dev:no_fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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