CVE-2018-5954 in phpFreeChat
Summary
by MITRE
phpFreeChat 1.7 and earlier allows remote attackers to cause a denial of service by sending a large number of connect commands.
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Analysis
by VulDB Data Team • 03/15/2025
The vulnerability identified as CVE-2018-5954 affects phpFreeChat version 1.7 and earlier, representing a critical denial of service weakness that can be exploited by remote attackers. This issue stems from the application's insufficient handling of connection requests, specifically when multiple connect commands are sent in rapid succession. The vulnerability manifests as a resource exhaustion condition that can overwhelm the application's ability to process legitimate user connections, effectively rendering the chat service unavailable to genuine users. The flaw resides in the protocol implementation where the system fails to properly rate limit or validate incoming connection attempts, creating a pathway for malicious actors to disrupt service availability. This vulnerability directly impacts the availability aspect of the CIA triad and can be classified under CWE-400, which addresses unspecified resource exhaustion conditions. The attack vector is particularly concerning as it requires minimal technical expertise to execute, making it a popular choice for disruptive attacks against chat applications.
The technical implementation of this vulnerability demonstrates a classic resource exhaustion pattern where the phpFreeChat application does not adequately implement connection throttling mechanisms. When numerous connect commands are received simultaneously, the system's processing capacity becomes saturated, leading to a cascade of failed connection attempts and ultimately service unavailability. The flaw is particularly insidious because it operates at the protocol level rather than exploiting application logic errors or memory corruption vulnerabilities. Attackers can leverage this weakness by establishing multiple simultaneous connection attempts, causing the application to consume excessive memory or processing resources. The vulnerability does not require authentication or specific privileges to exploit, making it accessible to any remote attacker with network access to the affected system. This characteristic aligns with ATT&CK technique T1499.004, which covers network denial of service attacks through resource exhaustion. The lack of proper input validation and connection management creates a persistent vulnerability that can be amplified through automated tools or botnets, increasing the potential impact of the attack.
The operational impact of CVE-2018-5954 extends beyond simple service disruption, potentially affecting business continuity and user experience for organizations relying on phpFreeChat for communication infrastructure. When exploited successfully, the vulnerability can cause cascading failures within the application ecosystem, particularly if the chat service is integrated with other business-critical systems. Organizations may experience increased support tickets, user complaints, and potential revenue loss if the service becomes unavailable during critical business hours. The vulnerability's exploitation can also serve as a precursor to more sophisticated attacks, as attackers often use denial of service as a distraction while conducting other malicious activities. The impact is particularly severe for websites or applications that depend on real-time communication features, where the chat functionality is integral to user engagement and business operations. Security teams must consider the broader implications of this vulnerability within their incident response planning, as it represents a straightforward but effective method for disrupting service availability. The vulnerability's presence also indicates potential weaknesses in the overall security posture of systems running vulnerable versions of phpFreeChat, suggesting that additional security controls may be necessary to protect against similar threats.
Mitigation strategies for CVE-2018-5954 should focus on immediate remediation through software updates and implementation of connection rate limiting mechanisms. The most effective solution involves upgrading to phpFreeChat version 1.8 or later, where the vulnerability has been addressed through improved connection handling and resource management. Organizations should implement network-level rate limiting to restrict the number of connection attempts from individual IP addresses within a given time frame, preventing single attackers from overwhelming the system. Additionally, administrators should configure application-level rate limiting to control the frequency of connect commands processed by the chat service. The implementation of monitoring and alerting systems can help detect unusual connection patterns that may indicate exploitation attempts, enabling rapid response to potential attacks. Security controls should also include network segmentation to isolate the chat service from critical infrastructure, reducing the potential impact of successful exploitation. Organizations should conduct regular vulnerability assessments to identify similar weaknesses in other applications and systems, as the underlying architectural issues that enable this vulnerability often exist in other components of the application stack. The remediation process should also include comprehensive testing to ensure that rate limiting mechanisms do not inadvertently block legitimate users while effectively mitigating the denial of service threat.