Description Preview
A Cross-Site Scripting (XSS) vulnerability has been identified in Nacos version 2.0.3. The vulnerability exists in the auth/users endpoint, where the pageSize and pageNo parameters are not properly sanitized before being reflected back to users. This allows attackers to inject malicious JavaScript code that executes in victims' browsers when they access the affected pages, potentially leading to session hijacking, credential theft, or other client-side attacks.
Overview
Nacos is a popular open-source platform designed for dynamic service discovery, configuration management, and service management. The vulnerability (CVE-2021-44667) affects version 2.0.3 and possibly earlier versions. The issue is classified as CWE-79 (Cross-Site Scripting), which occurs when user-controllable input is not properly validated or encoded before being included in output HTML. In this specific case, the pageSize and pageNo parameters in the auth/users endpoint can be manipulated to inject malicious scripts that execute in users' browsers. This vulnerability could allow attackers to steal session cookies, credentials, or perform actions on behalf of authenticated users.
Remediation
To address this vulnerability, organizations should:
- Upgrade to a patched version of Nacos if available
- If upgrading is not immediately possible, implement input validation for the pageSize and pageNo parameters
- Consider implementing a Web Application Firewall (WAF) rule to filter potentially malicious requests targeting the auth/users endpoint
- Apply the principle of least privilege to Nacos administrative interfaces, restricting access to authorized personnel only
- Monitor for suspicious activity in logs that might indicate exploitation attempts
References
- GitHub Issue: https://github.com/alibaba/nacos/issues/7359 - Contains details about the vulnerability discovery and discussion
- CWE-79: https://cwe.mitre.org/data/definitions/79.html - Information about Cross-Site Scripting vulnerabilities
- OWASP XSS Prevention Cheat Sheet: https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html - Guidance on preventing XSS vulnerabilities
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.
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- ManufacturingManufacturing
- Retail TradeRetail Trade
- 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
- 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
- Transportation & WarehousingTransportation & Warehousing
- UtilitiesUtilities
- Wholesale TradeWholesale Trade
