CVE-2013-0003 in .NET Framework
Summary
by MITRE
Buffer overflow in a System.DirectoryServices.Protocols (S.DS.P) namespace method in Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4, and 4.5 allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (XBAP) or (2) a crafted .NET Framework application that leverages a missing array-size check during a memory copy operation, aka "S.DS.P Buffer Overflow Vulnerability."
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Analysis
by VulDB Data Team • 04/20/2021
The vulnerability identified as CVE-2013-0003 represents a critical buffer overflow flaw within the System.DirectoryServices.Protocols namespace of Microsoft .NET Framework versions 2.0 SP2 through 4.5. This issue stems from inadequate input validation mechanisms that fail to properly check array sizes during memory copy operations, creating a exploitable condition that can be leveraged by remote attackers to execute arbitrary code on affected systems. The vulnerability specifically affects the underlying implementation of directory services protocols that handle LDAP (Lightweight Directory Access Protocol) communications, making it particularly dangerous in enterprise environments where directory services are extensively used for authentication and authorization processes.
The technical exploitation of this vulnerability occurs through two primary attack vectors: crafted XAML browser applications and malicious .NET Framework applications. In the case of XBAP applications, attackers can construct specially designed XAML content that triggers the buffer overflow when the application attempts to process directory service responses. The flaw manifests when the S.DS.P namespace methods fail to validate the size of incoming data arrays before performing memory copy operations, allowing attackers to overwrite adjacent memory locations with malicious payloads. This type of vulnerability maps directly to CWE-121, which describes heap-based buffer overflow conditions, and specifically aligns with ATT&CK technique T1059.001 for command and scripting interpreter, as successful exploitation enables arbitrary code execution. The vulnerability's impact is amplified by the fact that it can be triggered remotely without requiring authentication, making it particularly dangerous for web-facing applications and services that utilize directory services.
The operational impact of this vulnerability extends beyond simple code execution, as it can enable attackers to gain unauthorized access to sensitive directory information, escalate privileges within the domain, and potentially compromise entire enterprise networks. Systems running affected .NET Framework versions that interact with LDAP services become vulnerable attack vectors, particularly in scenarios where applications process untrusted directory service data or where users can influence the content of directory queries. The vulnerability affects organizations using Microsoft's directory services infrastructure, including Active Directory environments, where the System.DirectoryServices.Protocols namespace is commonly employed for directory operations. Attackers can leverage this vulnerability to establish persistent access, extract credentials, and perform lateral movement within networks, making it a significant concern for security teams responsible for protecting enterprise infrastructure and maintaining compliance with security standards such as NIST SP 800-53.
Mitigation strategies for CVE-2013-0003 primarily focus on applying Microsoft security updates and patches that address the underlying buffer overflow condition in the .NET Framework implementations. Organizations should prioritize immediate deployment of the relevant security patches released by Microsoft, as these updates include proper array size validation and memory copy operations that prevent the overflow condition. Additionally, implementing network segmentation and access controls can limit the potential impact of successful exploitation by restricting access to directory services and limiting the attack surface. Security monitoring should be enhanced to detect anomalous directory service queries or unusual memory usage patterns that might indicate exploitation attempts. System administrators should also consider disabling unnecessary directory service functionality and implementing strict input validation for all applications that utilize the affected S.DS.P namespace methods. The vulnerability's classification as a remote code execution flaw necessitates comprehensive network security measures including firewall rules, intrusion detection systems, and regular vulnerability assessments to identify and remediate similar conditions throughout the enterprise infrastructure.