CVE-2005-3652 in Program Neighborhood Client
Summary
by MITRE
Heap-based buffer overflow in Citrix Program Neighborhood client 9.0 and earlier allows remote attackers to execute arbitrary code via a long name value in an Application Set response.
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Analysis
by VulDB Data Team • 06/13/2019
The vulnerability identified as CVE-2005-3652 represents a critical heap-based buffer overflow in Citrix Program Neighborhood client version 9.0 and earlier implementations. This flaw exists within the client-side processing of Application Set responses, specifically when handling excessively long name values. The vulnerability stems from inadequate input validation and boundary checking mechanisms within the memory management routines of the Citrix client software, creating a scenario where attacker-controlled data can overwrite adjacent memory locations in the heap. The heap-based nature of this overflow means that the vulnerability manifests in the dynamic memory allocation areas where program variables and data structures are stored during runtime execution.
The technical exploitation of this vulnerability occurs when a remote attacker crafts a malicious Application Set response containing an abnormally long name value that exceeds the allocated buffer size. When the Citrix Program Neighborhood client processes this malformed response, the insufficient bounds checking allows the excessive data to overflow into adjacent heap memory regions. This overflow can overwrite critical memory pointers, function return addresses, or other control data structures, potentially enabling attackers to redirect program execution flow. The vulnerability's remote exploitability means that attackers can trigger the condition without requiring local system access, making it particularly dangerous in networked environments where Citrix clients may be exposed to untrusted network traffic. The heap corruption can result in arbitrary code execution with the privileges of the affected user account, potentially leading to complete system compromise.
The operational impact of this vulnerability extends beyond immediate exploitation capabilities to encompass significant security risks for organizations relying on Citrix Program Neighborhood client deployments. Systems utilizing vulnerable client versions become susceptible to remote code execution attacks that could allow attackers to install malware, establish backdoors, or escalate privileges within the network environment. The vulnerability affects enterprise environments where Citrix client software is widely deployed for application delivery and remote access services, making it a prime target for attackers seeking to compromise multiple systems simultaneously. Organizations may experience service disruption, data breaches, and potential lateral movement within their networks as attackers leverage this vulnerability to gain unauthorized access to sensitive corporate resources. The long-term implications include increased security maintenance overhead, potential regulatory compliance violations, and damage to organizational reputation due to successful exploitation attempts.
Mitigation strategies for CVE-2005-3652 should prioritize immediate patching of affected Citrix Program Neighborhood client installations to the latest available versions that contain proper buffer overflow protections and input validation mechanisms. Network segmentation and firewall rules should be implemented to restrict access to Citrix client services from untrusted networks, reducing the attack surface available to potential adversaries. Additionally, implementing intrusion detection systems with signature-based detection for known exploit patterns related to this vulnerability can provide early warning capabilities. Organizations should conduct comprehensive vulnerability assessments to identify all instances of the vulnerable client software across their infrastructure and establish monitoring procedures to detect anomalous network traffic patterns that may indicate exploitation attempts. The vulnerability aligns with CWE-121 heap-based buffer overflow conditions and corresponds to attack techniques described in the MITRE ATT&CK framework under initial access and execution phases, specifically targeting credential access and privilege escalation tactics.