CVE-2006-2095 in Phex
Summary
by MITRE
Phex before 2.8.6 allows remote attackers to cause a denial of service (application hang) by initiating multiple chat requests to a single user and then logging off.
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Analysis
by VulDB Data Team • 07/25/2018
The vulnerability identified as CVE-2006-2095 affects Phex versions prior to 2.8.6, a peer-to-peer file sharing application that operates within the gnutella network protocol framework. This issue represents a classic denial of service condition that exploits the application's handling of chat communication protocols within its distributed network architecture. The vulnerability specifically targets the chat functionality of the software, which is integrated into the broader file sharing ecosystem that many users relied upon during the mid-2000s era of peer-to-peer networking.
The technical flaw manifests when an attacker initiates multiple concurrent chat requests to a single target user within the Phex network environment. This malicious behavior exploits an insufficient input validation mechanism within the application's chat handling subsystem, which fails to properly manage or limit concurrent connection attempts. The vulnerability stems from inadequate resource management and connection state handling within the application's communication layer, creating a condition where the application becomes unresponsive or enters a state of application hang. This behavior aligns with CWE-400, which categorizes improper resource management as a fundamental weakness in software systems, particularly in networked applications that must handle multiple concurrent connections.
The operational impact of this vulnerability extends beyond simple service disruption, as it can effectively render the targeted user's Phex client unusable for legitimate file sharing activities. When the application hangs due to excessive chat requests, users experience complete loss of functionality within the client interface, preventing them from accessing their shared files, initiating new file transfers, or participating in network operations. This attack vector is particularly concerning because it requires minimal technical expertise to execute and can be performed by any network user with access to the target system, making it a widespread threat within peer-to-peer networks where users often maintain open connections for extended periods.
The attack mechanism operates through the exploitation of the application's chat protocol implementation, which lacks proper rate limiting or connection throttling mechanisms. When multiple simultaneous chat requests are received, the application's event handling system becomes overwhelmed with processing demands, leading to resource exhaustion or deadlock conditions. This vulnerability demonstrates a critical flaw in the application's architecture where the chat service is not properly isolated from other core application functions, allowing resource contention that ultimately results in system unresponsiveness. The issue also reflects poor adherence to secure coding practices as outlined in the ATT&CK framework's application layer techniques, where insufficient input validation and resource management contribute to denial of service conditions.
Mitigation strategies for this vulnerability involve implementing proper connection limiting mechanisms within the chat subsystem, establishing rate limiting for incoming chat requests, and implementing robust resource management protocols to prevent application hang conditions. System administrators should consider updating to Phex version 2.8.6 or later, which includes patches addressing the specific resource management flaws in the chat handling code. The solution requires modifications to the application's protocol handling to ensure that incoming connection requests are properly validated and limited, preventing the accumulation of pending connections that lead to resource exhaustion. Additionally, implementing proper error handling and timeout mechanisms within the chat service can prevent the application from becoming unresponsive when encountering abnormal connection patterns, thus providing a more resilient system architecture that aligns with industry standards for secure peer-to-peer network applications.