CVE-2011-1707 in iPrint
Summary
by MITRE
Stack-based buffer overflow in nipplib.dll in Novell iPrint Client before 5.64 allows remote attackers to execute arbitrary code via a crafted op-printer-list-all-jobs parameter in a printer-url.
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Analysis
by VulDB Data Team • 11/08/2021
The vulnerability identified as CVE-2011-1707 represents a critical stack-based buffer overflow flaw within the nipplib.dll library component of Novell iPrint Client software versions prior to 5.64. This vulnerability exists in the handling of printer URL parameters, specifically when processing the op-printer-list-all-jobs directive. The flaw stems from insufficient input validation and bounds checking within the print job listing functionality, creating a condition where maliciously crafted input can overwrite adjacent memory locations on the stack. The affected system components operate within the context of the iPrint client application, which is commonly used for managing print jobs and printer configurations in enterprise environments. This vulnerability is particularly concerning because it allows remote attackers to execute arbitrary code without requiring local system access or authentication, making it a significant threat vector for network-based attacks.
The technical implementation of this buffer overflow occurs when the iPrint client processes a specially crafted printer URL containing the op-printer-list-all-jobs parameter. The vulnerability manifests through improper handling of user-supplied input that exceeds the allocated buffer space within the nipplib.dll library. When the application attempts to process the oversized parameter, it writes data beyond the boundaries of the intended memory buffer, potentially overwriting critical stack memory including return addresses, function pointers, and local variables. This memory corruption can be exploited by attackers to redirect program execution flow and inject malicious code into the target system's memory space. The flaw is classified under CWE-121 as a stack-based buffer overflow, which is a well-documented vulnerability pattern where insufficient bounds checking allows attackers to overwrite stack memory and potentially gain control over the executing process.
The operational impact of this vulnerability extends beyond simple code execution, as it can enable attackers to achieve complete system compromise when exploited successfully. Remote code execution capabilities allow threat actors to install malware, establish persistence mechanisms, and potentially escalate privileges within the compromised environment. The vulnerability affects organizations that rely on Novell iPrint Client for printer management, particularly those with network-accessible print servers or shared printer configurations. Attackers can leverage this vulnerability through various attack vectors including malicious web pages, crafted print job requests, or by exploiting misconfigured network services that expose the iPrint client functionality. The remote nature of the exploit means that attackers do not need physical access to target systems, significantly expanding the attack surface and potential impact. Organizations with legacy iPrint client installations remain particularly vulnerable, as the affected versions lack proper input sanitization and memory protection mechanisms that would normally prevent such overflow conditions.
Mitigation strategies for CVE-2011-1707 primarily focus on immediate software updates and network-level protections. The most effective remediation involves upgrading the Novell iPrint Client to version 5.64 or later, which includes proper input validation and buffer size checks within the nipplib.dll component. Organizations should also implement network segmentation and access controls to limit exposure of iPrint client functionality to untrusted networks. Security professionals should consider disabling unnecessary print services and implementing strict input filtering for all printer-related communications. Additionally, deploying intrusion detection systems that can identify suspicious printer URL patterns and monitoring for unusual print job activities can provide early warning of potential exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation would enable attackers to execute arbitrary commands on compromised systems. Regular vulnerability assessments and penetration testing should be conducted to identify similar buffer overflow conditions in other network services and applications, as this represents a common class of vulnerability that affects many enterprise systems. Organizations should also maintain comprehensive incident response procedures specifically addressing remote code execution vulnerabilities in print management systems, given the potential for widespread compromise across networked environments.