CVE-2013-3134 in .NET Framework
Summary
by MITRE
The Common Language Runtime (CLR) in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 on 64-bit platforms does not properly allocate arrays of structures, which allows remote attackers to execute arbitrary code via a crafted .NET Framework application that changes array data, aka "Array Allocation Vulnerability."
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Analysis
by VulDB Data Team • 05/18/2021
The CVE-2013-3134 vulnerability represents a critical memory management flaw within the Common Language Runtime of Microsoft .NET Framework versions 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 when operating on 64-bit systems. This vulnerability stems from improper array allocation handling for structures within the CLR, creating a condition where malicious code can manipulate memory layout during array operations. The flaw specifically affects the way the runtime allocates memory for arrays of structures, leading to potential memory corruption scenarios that adversaries can exploit to execute arbitrary code remotely.
The technical nature of this vulnerability falls under CWE-122, which describes "Heap-based Buffer Overflow" conditions in software systems. The vulnerability manifests when the CLR fails to properly validate array boundaries during structure allocation operations on 64-bit platforms, allowing attackers to craft specially designed .NET applications that manipulate array data in ways that exceed allocated memory boundaries. This improper memory management creates opportunities for attackers to overwrite adjacent memory locations, potentially leading to code execution privileges. The vulnerability is particularly dangerous because it operates at the runtime level, affecting all applications running on the affected .NET Framework versions regardless of their specific implementation.
From an operational impact perspective, this vulnerability presents significant security risks to organizations relying on .NET Framework applications in server environments. Attackers can leverage this flaw to execute malicious code remotely through crafted .NET applications, potentially gaining unauthorized access to systems, escalating privileges, or conducting further attacks within the network. The vulnerability affects a broad range of Microsoft .NET Framework versions, making it particularly concerning for enterprise environments where multiple framework versions may be in use simultaneously. Organizations running web applications, server applications, or any .NET-based services on 64-bit systems are at risk, as the attack vector requires only a malicious .NET application to be executed within the vulnerable environment.
Mitigation strategies for CVE-2013-3134 primarily involve applying Microsoft security updates and patches that address the specific array allocation flaw in the CLR. Organizations should prioritize patching all affected .NET Framework versions to prevent exploitation, particularly in production environments where 64-bit systems are prevalent. Additional defensive measures include implementing application whitelisting policies to restrict execution of untrusted .NET applications, monitoring for suspicious array allocation patterns, and employing runtime application protection solutions that can detect and prevent exploitation attempts. Security teams should also consider network segmentation and privilege separation to limit the potential impact of successful exploitation, while maintaining regular vulnerability assessments to identify any other potentially affected components within their .NET Framework deployments. The vulnerability aligns with ATT&CK technique T1059.001 for command and control through .NET applications and T1068 for privilege escalation through memory corruption attacks.