CVE-2008-2436 in iPrint Client
Summary
by MITRE
Multiple heap-based buffer overflows in the IppCreateServerRef function in nipplib.dll in Novell iPrint Client 4.x before 4.38 and 5.x before 5.08 allow remote attackers to execute arbitrary code via a long argument to the (1) GetPrinterURLList, (2) GetPrinterURLList2, or (3) GetFileList2 function in the Novell iPrint ActiveX control in ienipp.ocx.
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Analysis
by VulDB Data Team • 08/16/2019
The vulnerability identified as CVE-2008-2436 represents a critical heap-based buffer overflow flaw within the Novell iPrint Client software ecosystem. This vulnerability specifically affects versions 4.x prior to 4.38 and 5.x prior to 5.08, making it a significant concern for organizations utilizing legacy iPrint client implementations. The flaw resides in the IppCreateServerRef function within the nipplib.dll library, which serves as a core component for managing printer server references within the iPrint architecture. The vulnerability manifests through the Novell iPrint ActiveX control in ienipp.ocx, which exposes multiple entry points that can be exploited by remote attackers to manipulate memory structures.
The technical exploitation of this vulnerability occurs through the manipulation of specific function calls within the ActiveX control, namely GetPrinterURLList, GetPrinterURLList2, and GetFileList2 functions. These functions accept arguments that are processed without adequate bounds checking, allowing attackers to provide excessively long input parameters that exceed the allocated buffer space. When these functions process the oversized arguments, they overwrite adjacent memory locations on the heap, potentially corrupting critical program data structures or injecting malicious code into the execution flow. The heap-based nature of this overflow means that the attacker can manipulate heap metadata and function pointers, leading to arbitrary code execution with the privileges of the compromised process. This vulnerability directly maps to CWE-121 Heap-based Buffer Overflow, which is classified as a critical weakness in software security design.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a pathway to compromise entire network infrastructure through the iPrint client. Organizations that have not updated their iPrint client implementations remain at risk of unauthorized access to their printing environments, potentially leading to data exfiltration, privilege escalation, and further lateral movement within the network. The ActiveX control's integration with web browsers and corporate applications means that exploitation can occur through various attack vectors including malicious websites, email attachments, or compromised web applications that interact with iPrint services. This vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1068 for Exploitation for Privilege Escalation, demonstrating how the initial exploitation can lead to broader system compromise.
Mitigation strategies for this vulnerability require immediate patching of all affected iPrint client versions to the latest supported releases that contain the necessary memory bounds checking and input validation fixes. Organizations should implement network segmentation to limit access to iPrint services and restrict the execution of ActiveX controls in web browsers where possible. Security monitoring should focus on detecting anomalous behavior in printer service access patterns and unusual memory allocation patterns that might indicate exploitation attempts. The vulnerability also highlights the importance of maintaining up-to-date software inventories and implementing robust patch management processes to prevent similar issues in other legacy software components. Additionally, organizations should consider disabling ActiveX controls in environments where they are not strictly required, following the principle of least privilege to reduce the attack surface available to potential adversaries.