CVE-2020-7773 : Security Advisory and Response
Learn about CVE-2020-7773, a Cross-site Scripting (XSS) vulnerability in markdown-it-highlightjs before 3.3.1. Find out the impact, affected systems, and mitigation steps to secure your systems.
This CVE-2020-7773 article provides details about a Cross-site Scripting (XSS) vulnerability affecting markdown-it-highlightjs before version 3.3.1.
Understanding CVE-2020-7773
This vulnerability allows the insertion of malicious JavaScript via the lang value in markdown-it-highlightjs Inline code highlighting feature.
What is CVE-2020-7773?
CVE-2020-7773 is a Cross-site Scripting (XSS) vulnerability in markdown-it-highlightjs before version 3.3.1.
The Impact of CVE-2020-7773
- CVSS Base Score: 6.5 (Medium Severity)
- Attack Vector: Network
- Confidentiality Impact: High
- User Interaction: Required
Technical Details of CVE-2020-7773
This section provides technical details of the vulnerability.
Vulnerability Description
The vulnerability allows the insertion of malicious JavaScript code through the lang value in markdown-it-highlightjs.
Affected Systems and Versions
- Affected Product: markdown-it-highlightjs
- Affected Versions: Before 3.3.1
Exploitation Mechanism
- Attack Complexity: Low
- Privileges Required: None
- Exploit Code Maturity: Proof of Concept
Mitigation and Prevention
Protect your systems from CVE-2020-7773 with the following steps.
Immediate Steps to Take
- Update markdown-it-highlightjs to version 3.3.1 or higher.
- Avoid using untrusted input in the lang value.
Long-Term Security Practices
- Regularly monitor and update dependencies for known vulnerabilities.
- Implement input validation and output encoding to prevent XSS attacks.
Patching and Updates
- Apply official fixes and security patches promptly to mitigate the risk of XSS vulnerabilities.