Description Preview
A security vulnerability was identified in Mattermost Server versions prior to 3.0.0 where the application fails to properly secure cookies by not enforcing SSL/TLS protection. This vulnerability (CWE-295: Certificate Validation Issues) allows cookies to be transmitted over unencrypted connections, potentially exposing sensitive session information to attackers who could intercept network traffic. Without the secure flag set on cookies, authentication tokens and session data may be compromised through man-in-the-middle attacks.
Overview
This vulnerability affects Mattermost Server installations prior to version 3.0.0. The issue stems from improper cookie security configuration where cookies containing sensitive session information are not restricted to secure (HTTPS) connections only. When cookies lack the "secure" flag, they can be transmitted over unencrypted HTTP connections, making them susceptible to interception by attackers monitoring network traffic. This could lead to session hijacking, where an attacker steals a user's session token and impersonates them on the Mattermost platform, potentially gaining unauthorized access to sensitive communications and data.
Remediation
To address this vulnerability, administrators should:
- Upgrade Mattermost Server to version 3.0.0 or later, which properly enforces SSL for cookies
- Ensure that HTTPS is properly configured for all Mattermost server communications
- Configure web servers to use HSTS (HTTP Strict Transport Security) to prevent downgrade attacks
- After upgrading, invalidate all existing sessions to ensure any potentially compromised cookies are no longer valid
- Review server logs for any suspicious activity that might indicate exploitation of this vulnerability
References
- Mattermost Security Updates: https://mattermost.com/security-updates/
- CWE-295: Certificate Validation Issues: https://cwe.mitre.org/data/definitions/295.html
- OWASP Secure Cookie Attribute: https://owasp.org/www-community/controls/SecureCookieAttribute
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
