Description Preview
Overview
OSSEC-HIDS (Host Intrusion Detection System) is an open-source security monitoring tool that performs log analysis, integrity checking, rootkit detection, and alerting. The vulnerability affects the ossec-analysisd component, which is responsible for analyzing logs and generating alerts. When a local user with appropriate permissions sends specially crafted messages to the analysisd UNIX domain socket, it can trigger a NULL pointer dereference, resulting in a crash of the service. This vulnerability is classified as CWE-476 (NULL Pointer Dereference) and affects all versions from 2.7 through 3.5.0. The impact is limited to local users who have access to write to the UNIX domain socket, but it can disrupt the security monitoring capabilities of the system.
Remediation
To address this vulnerability, system administrators should:
- Update OSSEC-HIDS to the latest version that contains the fix for this vulnerability.
- If immediate updating is not possible, restrict access to the analysisd UNIX domain socket by ensuring proper file permissions are set.
- Monitor system logs for any unusual activity related to the ossec-analysisd service.
- Consider implementing additional access controls to limit which local users can interact with OSSEC components.
- Regularly audit user permissions to ensure the principle of least privilege is maintained.
References
- Original vulnerability report: https://github.com/ossec/ossec-hids/issues/1815
- Additional information: https://github.com/ossec/ossec-hids/issues/1821
- Gentoo Linux Security Advisory: https://security.gentoo.org/glsa/202007-33
- OSSEC official website: https://www.ossec.net/
- Common Weakness Enumeration: CWE-476 (NULL Pointer Dereference)
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.
- 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
