SB2020111621 - Cross-site scripting in markdown-it-highlightjs package for npm

Description

This security bulletin contains information about 1 vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2020-7773)

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

CVSSv4: 5.1 [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]

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 in "lang" in the Inline code highlighting feature. 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.

Remediation

Install update from vendor's website.

References

• https://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52
• https://github.com/valeriangalliat/markdown-it-highlightjs/pull/14
• https://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461