SB2021022003 - Multiple vulnerabilities in TinyMCE

Description

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2024-21911)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data passed via URL. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Inefficient regular expression complexity (CVE-ID: N/A)

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient regular expression complexity in the codesample plugin dependency when performing syntax highlighting of ruby code samples. A remote attacker can supply a poorly formed ruby code sample to cause a denial of service.

The issue can lock up the browser during syntax highlighting.

Remediation

Install update from vendor's website.

References

• https://www.npmjs.com/advisories/1601
• https://github.com/advisories/GHSA-w7jx-j77m-wp65
• https://www.tiny.cloud/docs/release-notes/release-notes56/#securityfixes
• https://github.com/tinymce/tinymce/security/advisories/GHSA-h96f-fc7c-9r55