CVE-2011-1700 in iPrint
Summary
by MITRE
Heap-based buffer overflow in nipplib.dll in Novell iPrint Client before 5.64 allows remote attackers to execute arbitrary code via a crafted profile-time parameter in a printer-url.
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Analysis
by VulDB Data Team • 11/08/2021
The vulnerability identified as CVE-2011-1700 represents a critical heap-based buffer overflow flaw within the nipplib.dll component of Novell iPrint Client versions prior to 5.64. This vulnerability exists in the handling of printer URL parameters during profile time processing, creating a remote code execution vector that can be exploited by attackers positioned outside the target network. The flaw specifically manifests when the iPrint client processes malformed printer URLs containing crafted parameters that exceed the allocated buffer space in memory, leading to memory corruption that can be leveraged for arbitrary code execution.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the nipplib.dll library responsible for processing printer configuration data. When a maliciously crafted printer URL is processed, the client fails to properly bounds-check parameter values, allowing attackers to overflow heap memory allocated for storing profile information. This heap corruption can be manipulated to overwrite critical memory locations including function pointers or return addresses, enabling attackers to redirect program execution flow and inject malicious code. The vulnerability operates at the application layer and requires no authentication to exploit, making it particularly dangerous in networked environments where users may inadvertently click on malicious links or be subjected to drive-by downloads.
The operational impact of CVE-2011-1700 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and persistent access within affected networks. Attackers can leverage this vulnerability to establish backdoors, escalate privileges, or deploy additional malware payloads. The vulnerability affects organizations using Novell iPrint Client versions before 5.64, which were widely deployed in enterprise environments for printer management and document processing. Given that the exploit requires only remote access to a vulnerable system through crafted printer URLs, it poses significant risk to organizations with web-facing services or those that allow untrusted users to submit printer configuration data. This vulnerability aligns with CWE-121, heap-based buffer overflow, and maps to attack techniques in the MITRE ATT&CK framework under T1059 for command and control execution and T1203 for exploitation for privilege escalation.
Organizations should immediately implement mitigation strategies including deployment of the official Novell iPrint Client patch version 5.64 or later, which addresses the buffer overflow through proper input validation and memory bounds checking. Network segmentation and firewall rules should be implemented to restrict access to printer services and limit exposure to untrusted networks. Additionally, user education regarding suspicious printer URL links and the implementation of web application firewalls can provide additional protective layers. Regular vulnerability assessments should be conducted to identify other potential heap overflow vulnerabilities in similar network components, particularly those handling external input data. The remediation process should also include monitoring network traffic for exploitation attempts and implementing intrusion detection systems that can identify suspicious printer URL patterns that may indicate exploitation attempts.