SB2021012719 - Denial of service in CKEditor

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Main Vulnerability Database SB2021012719

SB2021012719 - Denial of service in CKEditor

Published: January 27, 2021

Security Bulletin ID SB2021012719
Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Input validation error (CVE-ID: CVE-2021-26271)

The vulnerability allows a remote attacker to perform a regular expression denial of service (ReDoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can trick the victim to paste a specially crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin) and perform a regular expression denial of service (ReDoS) attack.


2) Input validation error (CVE-ID: CVE-2021-26272)

The vulnerability allows a remote attacker to perform a regular expression denial of service (ReDoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can trick the victim to paste a specially crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin) and perform a regular expression denial of service (ReDoS) attack.


Remediation

Install update from vendor's website.

References