CVE-2013-3131 in .NET Framework
Summary
by MITRE
Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5, and Silverlight 5 before 5.1.20513.0, does not properly prevent changes to data in multidimensional arrays of structures, which allows remote attackers to execute arbitrary code via (1) a crafted .NET Framework application or (2) a crafted Silverlight application, aka "Array Access Violation Vulnerability."
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Analysis
by VulDB Data Team • 05/18/2021
The CVE-2013-3131 vulnerability represents a critical security flaw in Microsoft's .NET Framework and Silverlight runtime environments that stems from improper handling of multidimensional arrays containing structures. This vulnerability specifically affects versions 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 of the .NET Framework along with Silverlight 5 before version 5.1.20513.0. The flaw manifests when the runtime fails to properly validate modifications to data within multidimensional arrays of structures, creating a potential pathway for malicious code execution. This issue falls under the CWE-121 category of "Stack-based Buffer Overflow" and represents a classic memory corruption vulnerability that can be exploited to gain unauthorized code execution privileges.
The technical mechanism behind this vulnerability involves the .NET runtime's insufficient bounds checking when processing multidimensional arrays containing structured data types. When applications attempt to modify elements within these specific array configurations, the runtime's memory management system does not properly validate the boundaries of the data access operations. This allows attackers to manipulate memory locations beyond the intended array boundaries, potentially overwriting critical memory segments or executing arbitrary code within the application context. The vulnerability is particularly dangerous because it can be triggered through both .NET Framework applications and Silverlight applications, expanding the potential attack surface significantly.
Operational impact of CVE-2013-3131 extends across multiple threat vectors and attack scenarios. Remote attackers can leverage this vulnerability through crafted applications that manipulate multidimensional arrays in ways that trigger the memory corruption behavior. The vulnerability is particularly concerning in environments where Silverlight applications are deployed, as these applications often run with elevated privileges and can be delivered through web browsers. Attackers can construct malicious .NET applications or Silverlight applications that exploit this flaw to execute code with the privileges of the affected user, potentially leading to complete system compromise. According to ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter) and T1068 (Exploitation for Privilege Escalation) tactics, as it enables attackers to execute arbitrary commands and escalate privileges.
Mitigation strategies for CVE-2013-3131 primarily focus on applying Microsoft's security updates and patches, which address the underlying memory validation issues in the .NET Framework and Silverlight runtime components. Organizations should immediately deploy the relevant security updates from Microsoft, particularly targeting the specific versions mentioned in the vulnerability description. System administrators should also implement application whitelisting policies to restrict execution of untrusted .NET applications and Silverlight content, reducing the attack surface. Network segmentation and monitoring can help detect anomalous behavior patterns that might indicate exploitation attempts. Additionally, organizations should consider disabling Silverlight plugins in web browsers where possible, as this reduces the potential attack vectors for this particular vulnerability. The vulnerability demonstrates the importance of proper memory management and bounds checking in runtime environments, highlighting the need for comprehensive security testing of framework components and regular patch management procedures to prevent exploitation of such critical flaws.