CVE-2007-2954 in Novell
Summary
by MITRE
Multiple stack-based buffer overflows in the Spooler service (nwspool.dll) in Novell Client 4.91 SP2 through SP4 for Windows allow remote attackers to execute arbitrary code via certain long arguments to the (1) RpcAddPrinterDriver, (2) RpcGetPrinterDriverDirectory, and other unspecified RPC requests, aka Novell bug 300870, a different vulnerability than CVE-2006-5854.
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Analysis
by VulDB Data Team • 06/08/2025
The vulnerability described in CVE-2007-2954 represents a critical stack-based buffer overflow condition within the Novell Client spooler service component known as nwspool.dll. This flaw exists in Novell Client versions 4.91 SP2 through SP4 for Windows operating systems, making a significant portion of enterprise environments potentially vulnerable to remote exploitation. The vulnerability specifically affects the print spooler service functionality that handles various RPC (Remote Procedure Call) requests, creating a pathway for malicious actors to execute arbitrary code on targeted systems. The security implications are particularly severe given that the attack vector requires no authentication, allowing remote attackers to exploit the vulnerability from outside the network perimeter.
The technical mechanism behind this vulnerability involves the improper handling of input parameters within the Spooler service's RPC processing functions. When the RpcAddPrinterDriver and RpcGetPrinterDriverDirectory functions receive excessively long arguments, the service fails to properly validate the input length against the allocated buffer space, resulting in a classic stack buffer overflow condition. This overflow occurs because the implementation does not perform adequate bounds checking before copying data into fixed-size memory buffers on the stack. The vulnerability affects multiple RPC requests beyond the two explicitly mentioned, indicating a systemic issue within the service's input validation mechanisms. According to CWE-121, this represents a stack-based buffer overflow vulnerability where insufficient boundary checking allows attackers to overwrite adjacent stack memory locations, potentially corrupting program execution flow.
The operational impact of this vulnerability extends beyond simple code execution, as it can enable attackers to gain full control over affected systems. Remote code execution capabilities provide adversaries with the ability to install malware, establish persistent backdoors, or conduct further reconnaissance within the network. The vulnerability's classification under ATT&CK technique T1059.007 (Command and Scripting Interpreter: PowerShell) suggests that attackers could leverage this privilege escalation to deploy PowerShell-based payloads for deeper system compromise. Additionally, the spooler service typically runs with elevated privileges, making successful exploitation particularly dangerous as it could lead to domain-wide compromise. Organizations using Novell Client versions in this affected range face significant risk, especially in environments where the spooler service is exposed to untrusted networks or where network segmentation is inadequate.
Mitigation strategies for this vulnerability should prioritize immediate patch deployment from Novell, as the vendor has released updates addressing the buffer overflow conditions in nwspool.dll. System administrators should implement network segmentation to restrict access to the spooler service ports, particularly focusing on blocking RPC communication on ports 135 and 139, which are commonly used by these services. The principle of least privilege should be enforced by configuring the spooler service to run with minimal required permissions rather than administrative privileges. Network monitoring should be enhanced to detect unusual RPC traffic patterns that might indicate exploitation attempts, particularly around the affected RPC function calls. Organizations should also consider disabling the print spooler service entirely if print functionality is not essential for their operations, as recommended in the NIST SP 800-125 guidelines for secure system configuration. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of the vulnerable Novell Client versions within the enterprise environment.