CVE-2009-20005 in Caché
Summary
by MITRE • 09/16/2025
A stack-based buffer overflow exists in the UtilConfigHome.csp endpoint of InterSystems Caché 2009.1. The vulnerability is triggered by sending a specially crafted HTTP GET request containing an oversized argument to the .csp handler. Due to insufficient bounds checking, the input overflows a stack buffer, allowing an attacker to overwrite control structures and execute arbitrary code. It is unknown if this vulnerability was patched and an affected version range remains undefined.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability described in CVE-2009-20005 represents a critical stack-based buffer overflow within the InterSystems Caché 2009.1 web application framework, specifically affecting the UtilConfigHome.csp endpoint. This flaw resides in the HTTP GET request processing mechanism where the application fails to properly validate input length before copying data into stack-allocated buffers. The affected component serves as a configuration management interface within the Caché web application server, making it a potential entry point for malicious actors seeking to compromise the underlying system. The vulnerability demonstrates characteristics consistent with CWE-121 Stack-based Buffer Overflow, where insufficient bounds checking allows attackers to overwrite adjacent stack memory locations including return addresses and saved registers.
The technical exploitation of this vulnerability requires an attacker to craft a specially formatted HTTP GET request containing an oversized argument parameter that exceeds the allocated stack buffer size. When the web application processes this malformed request through the .csp handler, the unchecked input copy operation causes the stack buffer to overflow, potentially corrupting the stack frame and overwriting critical control structures. This memory corruption can lead to arbitrary code execution with the privileges of the web server process, which typically runs with elevated system permissions. The attack vector is particularly concerning because it leverages the standard HTTP protocol and web application interface, making it accessible through routine network scanning and exploitation tools. The vulnerability's impact is amplified by the fact that it operates at the application layer, potentially bypassing network-level security controls such as firewalls and intrusion detection systems.
The operational implications of this vulnerability extend beyond simple code execution, as successful exploitation could result in complete system compromise and data breaches. Attackers could leverage this flaw to establish persistent backdoors, escalate privileges to system administrator levels, or use the compromised system as a launch point for further attacks within the network infrastructure. The configuration management interface targeted by this vulnerability provides access to sensitive system settings, potentially allowing attackers to modify security policies, disable logging mechanisms, or manipulate application configurations. This type of vulnerability aligns with ATT&CK technique T1059.007 Command and Scripting Interpreter: PowerShell, as it enables attackers to execute arbitrary commands through the web application interface, though the specific exploitation method would involve direct memory corruption rather than scripting. Organizations using InterSystems Caché 2009.1 are particularly vulnerable because the affected version predates modern security hardening practices and lacks the input validation mechanisms that would prevent such attacks.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security improvements. The primary recommendation involves upgrading to a patched version of InterSystems Caché, as the vendor would have implemented proper input validation and bounds checking mechanisms to prevent buffer overflows. Organizations should also implement network segmentation and access controls to limit exposure of the affected web application to untrusted networks. Additional defensive measures include deploying web application firewalls to detect and block malformed requests, implementing input sanitization at the application level, and conducting regular security assessments to identify similar vulnerabilities. The vulnerability highlights the importance of applying security patches promptly and maintaining up-to-date software inventory to prevent exploitation of known vulnerabilities. Given the undefined affected version range and unknown patch status, organizations should conduct thorough vulnerability assessments to determine if they are running vulnerable versions and implement compensating controls until proper patches can be deployed. Security monitoring should focus on detecting unusual HTTP GET requests with oversized parameters and anomalous application behavior that might indicate exploitation attempts.