CVE-2020-15249 : Exploit Details and Defense Strategies
Learn about CVE-2020-15249, a stored XSS vulnerability in October CMS versions 1.0.319 to 1.0.468. Find out the impact, affected systems, exploitation, and mitigation steps.
October CMS from version 1.0.319 to 1.0.468 allowed backend users to upload SVG files without proper sanitization, potentially leading to stored XSS vulnerabilities.
Understanding CVE-2020-15249
This CVE describes a stored XSS vulnerability in October CMS versions 1.0.319 to 1.0.468, allowing authenticated backend users to upload malicious SVG files.
What is CVE-2020-15249?
- October CMS, a self-hosted CMS platform based on Laravel PHP Framework, had a security issue allowing backend users to upload SVG files without proper sanitization.
- This vulnerability could enable attackers to upload JavaScript within SVG files, leading to potential XSS attacks.
The Impact of CVE-2020-15249
- CVSS Score: 2.8 (Low)
- Attack Vector: Local
- Privileges Required: Low
- User Interaction: Required
- Integrity Impact: Low
- Confidentiality Impact: None
- Availability Impact: None
- Scope: Unchanged
- Attack Complexity: Low
- Vector String: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
- CWE ID: CWE-79 Cross-site Scripting (XSS)
Technical Details of CVE-2020-15249
Vulnerability Description
- Backend users in October CMS versions 1.0.319 to 1.0.468 could upload SVG files without proper sanitization, potentially leading to stored XSS vulnerabilities.
Affected Systems and Versions
- Affected Product: October
- Vendor: OctoberCMS
- Affected Versions: >= 1.0.319, < 1.0.469
Exploitation Mechanism
- Attackers could upload SVG files containing malicious JavaScript, exploiting the lack of sanitization, and potentially execute code within the website's domain.
Mitigation and Prevention
Immediate Steps to Take
- Update October CMS to Build 469 (v1.0.469) or version 1.1.0 to patch the vulnerability.
- Avoid uploading untrusted SVG files to the CMS.
Long-Term Security Practices
- Regularly monitor and update CMS platforms for security patches.
- Educate users on safe file upload practices to prevent similar vulnerabilities.
Patching and Updates
- Apply security patches promptly to ensure protection against known vulnerabilities.