CVE-2020-11055 : What You Need to Know
Learn about CVE-2020-11055, a Cross-site Scripting vulnerability in BookStack versions 0.18.0 to 0.29.2. Discover the impact, affected systems, and mitigation steps to secure your environment.
In BookStack greater than or equal to 0.18.0 and less than 0.29.2, an XSS vulnerability in comment creation allows malicious users to inject custom JavaScript code.
Understanding CVE-2020-11055
This CVE involves a Cross-site Scripting (XSS) vulnerability in BookStack versions between 0.18.0 and 0.29.2.
What is CVE-2020-11055?
- Users with comment creation permissions can post HTML containing malicious code that gets executed/displayed to other users, potentially impacting their machines.
The Impact of CVE-2020-11055
- Severity: Medium (CVSS Base Score: 6.3)
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: Low
- Scope: Unchanged
- Exploitation does not require user interaction.
Technical Details of CVE-2020-11055
This section provides detailed technical information about the vulnerability.
Vulnerability Description
- CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)
- Affects BookStack versions >= 0.18.0, < 0.29.2
Affected Systems and Versions
- Product: BookStack
- Vendor: BookStackApp
- Vulnerable Versions: >= 0.18.0, < 0.29.2
Exploitation Mechanism
- Malicious users with comment creation permissions can inject custom JavaScript code into comments.
Mitigation and Prevention
Protect your systems from CVE-2020-11055 with these mitigation strategies.
Immediate Steps to Take
- Upgrade BookStack to version 0.29.2 or later to fix the vulnerability.
- Restrict comment creation permissions to trusted users only.
Long-Term Security Practices
- Regularly update and patch BookStack to the latest versions.
Patching and Updates
- Apply security patches promptly to prevent exploitation of known vulnerabilities.