CVE-2004-0946 in nfs-utils
Summary
by MITRE
rquotad in nfs-utils (rquota_server.c) before 1.0.6-r6 on 64-bit architectures does not properly perform an integer conversion, which leads to a stack-based buffer overflow and allows remote attackers to execute arbitrary code via a crafted NFS request.
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Analysis
by VulDB Data Team • 01/19/2025
The vulnerability described in CVE-2004-0946 represents a critical stack-based buffer overflow in the rquotad component of nfs-utils version 1.0.6-r6 and earlier on 64-bit systems. This flaw exists within the rquota_server.c source file where improper integer conversion handling creates conditions for malicious input to overwrite stack memory. The vulnerability specifically affects 64-bit architectures where the integer size differences between 32-bit and 64-bit systems create unexpected behavior during data processing. The rquotad service operates as part of the Network File System utilities and is responsible for providing disk quota information to NFS clients, making it a critical component in networked storage environments.
The technical exploitation of this vulnerability occurs when remote attackers send specially crafted NFS requests that trigger the flawed integer conversion logic. When the system processes these requests, the improper handling of integer values causes buffer boundaries to be exceeded, leading to stack corruption that can be leveraged to execute arbitrary code with the privileges of the rquotad process. This represents a classic stack buffer overflow scenario where the vulnerability is classified under CWE-121 as a stack-based buffer overflow due to insufficient bounds checking during integer conversion operations. The flaw is particularly dangerous because it allows remote code execution without requiring authentication, making it a significant threat to networked systems.
Operationally, this vulnerability creates substantial risk for organizations relying on NFS services, as attackers can exploit it to gain unauthorized access to systems running vulnerable versions of nfs-utils. The attack surface is broad since rquotad typically runs on NFS servers and is accessible over the network. Successful exploitation can result in complete system compromise, allowing attackers to establish persistent access, escalate privileges, or use the compromised system as a launch point for further attacks within the network. The vulnerability also aligns with ATT&CK technique T1059.007 for command and script interpreter execution, as the remote code execution capability enables attackers to run malicious commands on affected systems. Organizations with NFS implementations may face severe consequences including data theft, system infiltration, and potential denial of service conditions.
The recommended mitigation strategy involves upgrading to nfs-utils version 1.0.6-r6 or later, which contains the necessary patches to address the integer conversion issue. System administrators should also implement network segmentation and access controls to limit exposure of NFS services to trusted networks only. Additional protective measures include monitoring for suspicious NFS traffic patterns, implementing intrusion detection systems to identify potential exploitation attempts, and conducting regular security assessments of NFS configurations. The fix addresses the root cause by ensuring proper integer type handling and bounds checking during buffer operations, preventing the stack corruption that enables arbitrary code execution. Organizations should also consider implementing the principle of least privilege for NFS services and regularly updating all network services to maintain security posture against similar vulnerabilities.