CVE-2000-0953 in Shambala Server
Summary
by MITRE
Shambala Server 4.5 allows remote attackers to cause a denial of service by opening then closing a connection.
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Analysis
by VulDB Data Team • 02/03/2025
The vulnerability identified as CVE-2000-0953 affects the Shambala Server version 4.5, representing a classic denial of service flaw that exploits connection handling mechanisms within the server implementation. This vulnerability resides in the server's protocol processing logic where it fails to properly manage connection lifecycle events, creating a condition that can be exploited by remote attackers to disrupt service availability. The flaw specifically manifests when an attacker opens a connection to the server and then immediately closes it without proper termination sequences, triggering an internal state management failure that results in service disruption.
The technical root cause of this vulnerability can be categorized under CWE-116, which addresses improper handling of synchronization issues, and CWE-400, relating to resource exhaustion vulnerabilities. The Shambala Server 4.5 implementation appears to lack proper connection state validation and cleanup procedures, causing the server to enter an unstable state when processing malformed connection sequences. When a connection is opened and immediately closed, the server's internal connection tracking mechanisms fail to properly release resources or reset internal state variables, leading to a cascading failure that can render the service unavailable to legitimate users.
From an operational perspective, this vulnerability presents a significant risk to service availability and system reliability, as it allows remote attackers with minimal technical expertise to cause service disruption. The attack vector requires only basic network connectivity and the ability to establish and terminate TCP connections, making it particularly dangerous as it can be exploited by automated tools or scripts. The impact extends beyond simple service interruption, potentially causing the server to crash or enter a loop where it continuously fails to process new legitimate connection requests. This type of vulnerability directly violates the availability principles of the CIA triad and can be classified under ATT&CK technique T1499.004, which covers network denial of service attacks.
The mitigation strategies for this vulnerability should focus on implementing proper connection state management and resource cleanup procedures within the server's protocol handling code. System administrators should consider applying vendor patches or updates if available, as the vulnerability represents a fundamental flaw in connection handling that requires code-level fixes. Network-level protections such as connection rate limiting and monitoring for unusual connection patterns can serve as interim measures to reduce the impact of such attacks. Additionally, implementing proper input validation and connection state tracking mechanisms would prevent the server from entering an inconsistent state when processing connection lifecycle events, thereby maintaining service availability even when subjected to malicious connection attempts.