CVE-2013-3132 in .NET Framework
Summary
by MITRE
Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not properly check the permissions of objects that use reflection, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (XBAP) or (2) a crafted .NET Framework application, aka "Delegate Reflection Bypass Vulnerability."
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Analysis
by VulDB Data Team • 05/18/2021
The CVE-2013-3132 vulnerability represents a critical security flaw in Microsoft .NET Framework versions spanning from 1.0 SP3 through 4.5, where the framework fails to properly validate object permissions during reflection operations. This vulnerability specifically targets the delegate reflection bypass mechanism, creating a pathway for malicious actors to execute arbitrary code remotely. The flaw stems from insufficient permission checks when objects utilize reflection APIs, allowing attackers to circumvent security boundaries that should normally prevent unauthorized code execution. The vulnerability is particularly dangerous because it affects multiple versions of the .NET Framework, providing attackers with broad exploitation opportunities across different system environments. This issue manifests through two primary attack vectors: crafted XAML browser applications and malicious .NET Framework applications, both of which can leverage the reflection bypass to gain elevated privileges and execute malicious payloads.
The technical exploitation of CVE-2013-3132 relies on the improper handling of reflection-based operations within the .NET Framework's security model. When applications utilize reflection APIs to dynamically access and manipulate objects, the framework should enforce strict permission checks to prevent unauthorized access to sensitive operations. However, this vulnerability allows attackers to bypass these security checks by crafting specific reflection calls that manipulate delegate objects in ways that circumvent normal permission validation. The flaw operates at the core of the .NET Framework's security architecture, specifically targeting the trust boundaries that separate different security contexts. According to CWE standards, this vulnerability maps to CWE-284, which describes improper access control in software systems, and CWE-255, which addresses issues with credential management and authentication. The vulnerability's classification as a privilege escalation issue indicates that attackers can leverage it to gain higher levels of system access than originally intended by the application's security model.
The operational impact of CVE-2013-3132 extends beyond simple code execution, as it enables attackers to establish persistent access to compromised systems. When exploited through XAML browser applications, the vulnerability can be triggered through web-based attacks where users unknowingly download and execute malicious XBAP files. These applications run within the browser context but can leverage the reflection bypass to execute arbitrary code with the privileges of the user running the application. The attack surface is particularly broad given that the vulnerability affects multiple .NET Framework versions, making it difficult for organizations to patch comprehensively. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1059 (Command and Scripting Interpreter) and T1068 (Exploitation for Privilege Escalation), as attackers can use the reflection bypass to execute malicious code and then escalate their privileges. The vulnerability also supports lateral movement strategies since successful exploitation can provide attackers with a foothold to access additional systems within the network.
Organizations affected by CVE-2013-3132 should implement immediate mitigation strategies to protect their systems from exploitation. Microsoft released security updates that address this vulnerability through proper permission validation during reflection operations, but organizations must ensure comprehensive patch deployment across all affected .NET Framework versions. Network segmentation and application whitelisting can provide additional defense layers, preventing malicious XBAP applications from executing on systems. Security monitoring should focus on detecting unusual reflection API usage patterns and unauthorized code execution attempts. The vulnerability's exploitation requires user interaction through web browsing or application execution, making user education and awareness programs crucial components of the defense strategy. Additionally, organizations should consider implementing runtime application protection measures and regular security assessments to identify potential exploitation attempts. The remediation process must account for the broad compatibility of affected .NET Framework versions, ensuring that patches do not break existing applications while maintaining system security. Given the vulnerability's potential for remote code execution, organizations should also review their incident response procedures to prepare for potential exploitation attempts.