CVE-2011-4186 in iPrint
Summary
by MITRE
Heap-based buffer overflow in nipplib.dll in Novell iPrint Client before 5.78 on Windows allows remote attackers to execute arbitrary code via a crafted client-file-name parameter in a printer-url, a different vulnerability than CVE-2011-1705.
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Analysis
by VulDB Data Team • 11/30/2021
The vulnerability identified as CVE-2011-4186 represents a critical heap-based buffer overflow in the nipplib.dll library component of Novell iPrint Client versions prior to 5.78 on Windows systems. This flaw exists within the client-side processing of printer URL parameters, specifically when handling the client-file-name component of printer URLs. The vulnerability is particularly concerning because it enables remote code execution through network-based attacks, allowing attackers to potentially compromise systems without requiring local access or authentication. The issue manifests when the iPrint client processes a malformed printer URL containing a crafted client-file-name parameter, leading to memory corruption that can be exploited to execute arbitrary code with the privileges of the affected user.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the nipplib.dll library. When the iPrint client receives a printer URL containing a malicious client-file-name parameter, the application fails to properly bounds-check the input data before copying it into a fixed-size heap buffer. This classic buffer overflow condition occurs because the application allocates a buffer of insufficient size to accommodate the potentially malicious input, allowing subsequent data writes to overwrite adjacent memory locations. The heap-based nature of this overflow means that the memory corruption affects dynamically allocated memory regions, making exploitation more complex but also more persistent than stack-based buffer overflows. The vulnerability operates at the application layer and can be triggered through network communication, making it particularly dangerous in enterprise environments where print services are frequently accessed across network boundaries.
From an operational impact perspective, this vulnerability creates significant security risks for organizations using Novell iPrint Client software. Remote attackers can leverage this flaw to execute arbitrary code on target systems, potentially leading to complete system compromise, data exfiltration, or lateral movement within the network. The vulnerability affects Windows environments specifically, making it relevant to enterprise networks where Windows-based systems dominate. Given that print services are often accessible from external networks, this vulnerability could be exploited by attackers from outside the organization, particularly if print servers are exposed to the internet or if users connect to corporate print services remotely. The exploitability of this vulnerability is enhanced by the fact that it requires no user interaction, as the malicious printer URL can be delivered through various means including email attachments, web pages, or network shares.
The security implications extend beyond immediate code execution capabilities to encompass broader enterprise risk management considerations. Organizations using vulnerable iPrint client versions face potential unauthorized access to sensitive network resources, as successful exploitation could provide attackers with elevated privileges and persistent access to the compromised systems. This vulnerability aligns with several ATT&CK framework techniques including T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation, demonstrating how initial access through network-based attacks can lead to more sophisticated compromise operations. The vulnerability also maps to CWE-121, heap-based buffer overflow, which is categorized as a fundamental memory safety issue that affects numerous software applications. Security professionals should note that this vulnerability requires immediate remediation through patching the Novell iPrint Client to version 5.78 or later, as no reliable workarounds exist for this specific memory corruption issue. Organizations should also implement network segmentation and access controls to limit exposure of print services to untrusted networks, while monitoring for suspicious network traffic patterns that might indicate exploitation attempts.