CVE-2006-2327 in NetWare
Summary
by MITRE
Multiple integer overflows in the DPRPC library (DPRPCNLM.NLM) NDPS/iPrint module in Novell Distributed Print Services in Novell NetWare 6.5 SP3, SP4, and SP5 allow remote attackers to execute arbitrary code via an XDR encoded array with a field that specifies a large number of elements, which triggers the overflows in the ndps_xdr_array function.
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Analysis
by VulDB Data Team • 07/26/2018
The vulnerability identified as CVE-2006-2327 represents a critical integer overflow flaw within the Novell Distributed Print Services (NDPS) module, specifically affecting the DPRPC library component known as DPRPCNLM.NLM. This issue exists within the NDPS/iPrint module of Novell NetWare 6.5 systems running service packs 3, 4, and 5, creating a significant security risk that can be exploited remotely by malicious actors. The flaw manifests in the ndps_xdr_array function where XDR encoded arrays are processed, making it a prime target for remote code execution attacks that could compromise entire network infrastructures.
The technical implementation of this vulnerability stems from improper handling of integer values during the processing of XDR encoded data structures. When an attacker sends a malicious XDR encoded array containing a field that specifies an excessive number of elements, the system fails to properly validate or constrain the integer values, leading to integer overflow conditions. These overflows occur because the system does not adequately check for arithmetic overflow conditions when calculating array sizes or element counts, allowing attackers to manipulate the integer values beyond their intended range. The flaw specifically affects the ndps_xdr_array function which is responsible for deserializing and processing array data structures within the NDPS framework, making it a critical component in the attack vector.
The operational impact of this vulnerability extends far beyond simple denial of service, as it provides attackers with the capability to execute arbitrary code on affected systems with the privileges of the running service. This remote code execution capability enables attackers to gain unauthorized access to print servers, potentially leading to complete system compromise, data exfiltration, or the establishment of persistent backdoors within network environments. The vulnerability affects organizations relying on Novell NetWare 6.5 for print services, creating risks for businesses that depend on distributed printing infrastructure and potentially exposing sensitive network resources to unauthorized access. The remote nature of the exploit means that attackers can target these systems from outside the network perimeter without requiring prior authentication or local access.
Organizations should implement immediate mitigations including applying the vendor-provided security patches and updates for Novell NetWare 6.5 service packs 3, 4, and 5 to address the integer overflow conditions in the DPRPC library. Network segmentation strategies should be employed to isolate print server infrastructure from critical network segments, while implementing robust monitoring solutions to detect anomalous XDR traffic patterns. Additionally, organizations should consider disabling unnecessary print services and implementing strict access controls to minimize potential attack surfaces. From a cybersecurity framework perspective, this vulnerability aligns with CWE-190, Integer Overflow or Wraparound, and maps to ATT&CK technique T1059.007 for remote code execution through network services, emphasizing the importance of proper input validation and integer arithmetic handling in network service implementations.