Description Preview
Pure-FTPd 1.0.48 contains a vulnerability that allows remote attackers to cause a denial of service by making enough connections to exceed the server's connection limit. This allocation of resources without limits (CWE-770) can prevent legitimate users from accessing the FTP server.
Overview
Pure-FTPd is a free FTP server designed with security in mind. In version 1.0.48, there is a vulnerability that allows attackers to exhaust server resources by creating multiple connections. When an attacker establishes enough connections to reach the server's connection limit, legitimate users are unable to connect to the service. This is a classic denial of service attack that exploits the lack of proper resource allocation controls in the application. The vulnerability is particularly concerning because it can be executed remotely without authentication, allowing an attacker to effectively take the FTP service offline.
Remediation
To mitigate this vulnerability, administrators should:
- Update Pure-FTPd to the latest version if a patch is available.
- Implement connection rate limiting at the network level using firewall rules.
- Configure the FTP server with appropriate connection limits per IP address.
- Consider implementing IP-based access controls to restrict connections from untrusted sources.
- Monitor server resources and implement automated responses to potential DoS attacks.
- Use intrusion detection/prevention systems to identify and block abnormal connection patterns.
- Consider implementing a reverse proxy or load balancer that can provide additional protection against resource exhaustion attacks.
References
- Exploit Database: https://www.exploit-db.com/exploits/49105
- CWE-770: Allocation of Resources Without Limits or Throttling: https://cwe.mitre.org/data/definitions/770.html
- MITRE CVE Entry: CVE-2020-35359
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
