CVE-2000-0555 in Ceilidh
Summary
by MITRE
Ceilidh allows remote attackers to cause a denial of service via a large number of POST requests.
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Analysis
by VulDB Data Team • 06/03/2019
The vulnerability identified as CVE-2000-0555 affects the Ceilidh web server software, presenting a significant denial of service risk that can be exploited by remote attackers through crafted network traffic. This vulnerability specifically targets the server's handling of POST requests, which are commonly used in web applications for submitting data to the server. The flaw manifests when an attacker sends a large volume of POST requests to the affected server, overwhelming its processing capabilities and causing legitimate service disruption.
The technical nature of this vulnerability stems from inadequate input validation and resource management within the Ceilidh server implementation. When processing POST requests, the server fails to properly limit or throttle the rate at which these requests are handled, allowing an attacker to flood the system with concurrent requests. This type of attack falls under the category of resource exhaustion attacks, where the attacker consumes system resources such as memory, CPU cycles, or connection slots faster than the server can process legitimate requests. The vulnerability is particularly dangerous because it can be executed without requiring authentication or specialized knowledge of the target system's internal workings.
From an operational impact perspective, this vulnerability creates severe service disruption for organizations relying on Ceilidh servers for their web hosting needs. The denial of service condition can render web applications completely inaccessible to legitimate users, potentially causing significant financial losses and damage to reputation. Organizations may experience complete unavailability of their websites, email services, or other web-based applications hosted on affected servers. The attack can be executed from any location with network access to the target server, making it particularly challenging to defend against, as it does not require physical proximity or insider knowledge.
The vulnerability aligns with several cybersecurity frameworks and threat models, including CWE-400 which categorizes it as an Uncontrolled Resource Consumption vulnerability, and ATT&CK technique T1498 which covers Defense Evasion through resource exhaustion attacks. Organizations should implement multiple layers of defense to mitigate this risk, including rate limiting mechanisms, connection throttling, and proper firewall configurations to restrict excessive request volumes. Network monitoring systems should be deployed to detect unusual traffic patterns that may indicate an ongoing attack. Additionally, implementing intrusion detection systems and configuring the Ceilidh server with proper resource limits can help prevent the vulnerability from being exploited successfully. Regular security updates and patches should be applied to address known vulnerabilities, and administrators should conduct thorough security assessments to identify and remediate similar weaknesses in their network infrastructure.