CVE-2007-0641 in dapcnfsd.dll
Summary
by MITRE
Buffer overflow in the EnumPrintersA function in dapcnfsd.dll 0.6.4.0 in Shaffer Solutions (SSC) DiskAccess NFS Client allows remote attackers to execute arbitrary code via a long argument, an issue similar to CVE-2006-5854 and CVE-2007-0444.
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Analysis
by VulDB Data Team • 08/18/2018
The vulnerability described in CVE-2007-0641 represents a critical buffer overflow flaw within the EnumPrintersA function of dapcnfsd.dll version 0.6.4.0, which is part of the Shaffer Solutions (SSC) DiskAccess NFS Client software. This issue arises from insufficient input validation and boundary checking mechanisms within the Windows-based network file system client implementation. The flaw specifically manifests when the EnumPrintersA function processes a malformed or excessively long argument parameter, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized code execution privileges.
The technical nature of this vulnerability aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows memory corruption. The flaw operates through a classic stack-based buffer overflow scenario where a maliciously crafted argument exceeds the allocated buffer space, causing adjacent memory locations to be overwritten. This particular implementation vulnerability affects the Windows application programming interface functions that enumerate available printers through network file system connections, making it particularly dangerous in enterprise environments where printer enumeration is frequently used for network discovery and management purposes. The vulnerability's similarity to CVE-2006-5854 and CVE-2007-0444 indicates a pattern of insecure coding practices within the SSC DiskAccess NFS Client implementation that affects multiple functions within the same software component.
Operationally, this vulnerability poses significant risks to organizations utilizing the affected SSC DiskAccess NFS Client software, particularly in networked environments where remote code execution capabilities can be leveraged to compromise entire network infrastructures. Attackers can exploit this condition by sending specially crafted network requests that trigger the buffer overflow during printer enumeration operations, potentially allowing them to execute arbitrary code with the privileges of the affected service or user account. The remote exploit nature of this vulnerability means that attackers do not require local access to the system, making it particularly dangerous for network services and applications that are accessible from external networks. The impact extends beyond simple code execution to include potential privilege escalation, data compromise, and system availability disruption, especially when the affected service runs with elevated privileges.
Mitigation strategies for CVE-2007-0641 should focus on immediate software updates and patches provided by Shaffer Solutions, as well as network-level defensive measures to restrict access to affected services. Organizations should implement network segmentation and access controls to limit exposure of the affected NFS client to untrusted networks, while also applying the vendor-provided security patches that address the buffer overflow conditions in the EnumPrintersA function. Network monitoring should be enhanced to detect unusual printer enumeration patterns or malformed network requests that could indicate exploitation attempts, and system administrators should consider implementing intrusion detection systems that can identify potential exploitation of similar vulnerabilities within the same software ecosystem. Additionally, the vulnerability demonstrates the importance of input validation and boundary checking practices in software development, aligning with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation often requires precise control over memory layout and execution flow.