Description Preview
CVE-2021-39459 affects the modules component in Yakamara Media Redaxo CMS version 5.12.1. The vulnerability allows authenticated CMS users to execute arbitrary code on the hosting system by injecting malicious PHP code into modules. This is classified as a CWE-78 (OS Command Injection) vulnerability, which enables attackers with valid credentials to compromise the underlying server hosting the CMS.
Overview
This vulnerability in Redaxo CMS 5.12.1 enables authenticated users to execute arbitrary PHP code on the server by exploiting the modules component. The issue stems from insufficient input validation and sanitization in the module handling functionality. Attackers can craft and upload malicious PHP code within modules, which when processed by the CMS, executes on the server with the permissions of the web server user. This could lead to complete system compromise, data theft, defacement, or use of the server for further attacks.
Remediation
- Update Yakamara Media Redaxo CMS to the latest version that contains patches for this vulnerability.
- If immediate updating is not possible, implement the following temporary measures:
- Restrict access to the CMS admin panel to trusted IP addresses
- Review and limit user permissions, especially for module creation and editing
- Implement additional security controls like Web Application Firewall rules to detect and block malicious PHP code injection
- Monitor system logs for suspicious activities
- Audit existing modules for potentially malicious code that might have been injected prior to remediation
- Consider implementing a principle of least privilege for all CMS users
References
- https://github.com/evildrummer/MyOwnCVEs/tree/main/CVE-2021-39459 - Contains detailed information about the vulnerability and possible exploit methods
- https://github.com/evildrummer/CVE-2021-XYZ - Additional exploit information and technical details
- MITRE CWE-78: https://cwe.mitre.org/data/definitions/78.html - Information about OS Command Injection vulnerabilities
- Yakamara Media Redaxo CMS documentation: https://redaxo.org/
Industry ExposureMost to leastThis section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
- Accommodation & Food ServicesAccommodation & Food Services
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting
- Arts, Entertainment & RecreationArts, Entertainment & Recreation
- ConstructionConstruction
- Educational ServicesEducational Services
- Finance and InsuranceFinance and Insurance
- Health Care & Social AssistanceHealth Care & Social Assistance
- InformationInformation
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- ManufacturingManufacturing
- MiningMining
- Other Services (except Public Administration)Other Services (except Public Administration)
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services
- Public AdministrationPublic Administration
- Real Estate Rental & LeasingReal Estate Rental & Leasing
- Retail TradeRetail Trade
- Transportation & WarehousingTransportation & Warehousing
- UtilitiesUtilities
- Wholesale TradeWholesale Trade
